The headers near the port will show 500F or more. CAR 3.675 Cylinder head temperature indicating system for air-cooled engines. Both are horizontally-opposed air-cooled designswith bolt-together aluminum case halves and bolt-on cylinders with sandcast aluminum headsscrewed onto nitrided steel barrels. Posts: 65. An air cooled VW engine cylinder head temperature is in a safe operating range of 300-350 (some say even a little higher than that). Someday, the U.S. will abandon the antiquated, difficult to use English system of measurement Thats why its so important to manage the powerplant in a fashion that limits CHTs to a tolerable value. That said the CR Machine Manufacturing billet cylinder head never sees the engine reaching over 230 degrees Celsius, due to it's significantly large cooling surface area compared to the standard cylinder head and other billet cylinder heads that i have tried. The amsoil oil is for small engines and I believe it is sae 30. The temperature it take to ignite gasoline is 495F. Abercrave Some have used their own NTC (negative temperature constant) resistor epoxied to the head as well. Always use a torque wrench to tighten the spark plug to specifications. Please only continue if you are prepared to be PATIENT. You do NOT want debris falling into the cylinder. However, its not essential to use EGT for leaning unless youre particularly curious about what air-fuel ratio you are using. All wiring must have some slack to allow for flexing of the side bar. because it help prevent the CHT sensor from getting chewed up by the base of the spark plug. We feel critical temperatures are 425F when the thermocouple is mounted under a 14mm spark plug. This website uses 'cookies' to give you the best, most relevant experience. VDO 600F Cylinder Head Temperature (CHT) Gauge, Cockpit, Black Face, 2 air cooled aircraft engines go up to a minimum of something in the 425F range which is about 218C. Engine wont start, screeches then shuts off. We serve the VW parts and VW Tech needs of owners of aircooled Type 1 VW Beetle, Karmann Ghia, Type 181 Thing, Type 2 Volkswagen Bus, Type 3 VW Squareback / Fastback / Squareback, and Type 411 & 412 Volkswagens. Copyright 2021, Savvy Aviation, Inc. All rights reserved. mechanical problems with the engine. By monitoring EGT, the driver or pilot can get an idea of the vehicle's air-fuel ratio (AFR). "Might as well while the engine is out" install senders for a CHT gauge. d.) CHT sensor installation Remove the existing spark plug. Swift Gauge Dual 2 Inch Round CHT/Tachometer Gauge 100-7000F/-8000 Rpm. At this point, irreversible damage occurs to both the piston and the cylinder. by Robert Hodge Sun Feb 15, 2009 6:58 pm, Post Air-cooled engines rely on natural air to keep the engine cool. EGT usually varies between normal and slightly elevated, often (but not always) in a rhythmic fashion with a frequency of roughly one or two cycles per minute. The tachometer electronics are very sensitive and will always pick up the spark. When a CHT gauge was offered at the factory (I think on microbuses only) it was just one sender on one head. problem being, it's a pretty well closed ducted fan setup on a pretty compact engine. Pilots who are concerned about this can buy synthetic oils that are not "racing" grade but they cost a lot more. A properly installed CHT gauge can help prevent this sort of catastrophe and prolong the life of your engine. SA9 1SH, t: 01639 732200 Stay tuned! 2007-2013 Michael D. Busch All Rights Reserved. So you can figure that fin temperatures are at least 100 degreees below the temp of the average head temperature. In the following photo, the gauge wires were secured the cooling shroud by a small zip tie. and why pilots should always use a premium 100% synthetic racing oil. 12v connection. by hambone Sun Apr 03, 2011 7:08 pm, Post trenton irwin high school; larry fink net worth 2020 Menu Toggle. This installation does not have a full length piece of HST to cover the gauge wires. The CHT gauge kits consist of a sensor and the gauge itself. Cool air is then forced over the fins -- typically by a fan in cars. Head temperatures are reported to range up to 315C while oil temperature can reach 120C. Either richening or leaning the mixture from that point decreases the burn rate, causes ppto occur later, and consequently reduces CHT. Swift Gauge Dual 2 Inch Round Cylinder Head Temperature 100-7000F | Aircraft Spruce THE AVIATION SUPERSTORE FOR ALL YOUR AIRCRAFT & PILOT NEEDS | 877-4-SPRUCE Home / Instruments / CHT Gauges / Falcon & Swift / Swift Gauge Dual 2 Inch Round Cylinder Head Temperature 100-7000F Swift Gauge Dual 2 Inch Round Cylinder Head Temperature 100-7000F A Just happened to be the right size. That is with high compression (155 psi) and a stock head w/squish band (which causes higher head temps and lower piston temps). CAI's new Cylinder Head Temperature Gauge is available in bothC or F in a 52 mm diameter case. Recently installed some CHT gauges on some fan cooled sleds. Bus Clearance; Golf Clearance; My account; . The "missing gauge" on an air-cooled vehicle. Complete installation instuction included in gauge kit. Make your product selections based on the PRODUCT DESCRIPTION and OPTION INFORMATION presented in the detailed product listing. Completely clogged fuel injector:Engine rough, EGT cold, CHT dropping. All products purchased should be inspected, measured, cleaned and properly assembled prior to installation. Remove the spacer washer, if there is one, and put it aside for the moment. Central - Fort Worth, TX Since Aircooled.Net has no control over product installation, we will not be held liable for any consequential costs or damages associated with products purchased. PRODUCT AVAILABILITY can vary and short-term backorders are common. you will know if your engine is running at peak output and when maintenance is required. For example, best power mixture is generally about 100F RP, while best economy mixture is generally 20F to 50F LOP. by airkooledchris Mon Apr 11, 2011 5:08 pm, Post VDO 600F Cylinder Head Temperature (CHT) Gauge, Cockpit, Black Face, 2 1/16", V310901. Depending on the engine, the cooling air duct may have to be modified in order for the CHT sensor to be mounted underneath the spark plug. Currently seeing 311F as a maximum. My column last month talked about the fact that our piston aircraft engines convert only about one-third of the energy contained in avgas into useful energy to the propeller. 12mm Fitting, 3M Sensor Cable. Install gauge in dash or in VDO gauge mounting pod. From the pilot's perspective, this involves learning the best practices for power control, leaning procedures, cooling, and other operational considerations. Malfunctioning magneto:Elevated EGT on all cylinders (usually about 50F or so). Figure 6: Cylinder head temperature gauges. tachometer, however, was the "insert type" for pushing into a rectangular opening (red arrows). The Thor engines do not require any air duct modification but The sensor wires are very durable but they cannot be stretched. As the 3.0 litre SC engine we have is proving troublesome and needs a rebuild it seems like a good idea to try to convert the CIS to an EFI and I have been looking at various options. used on the Top 80 and most other motors. also pollute more. Out on the road on a 90 day my head temperature runs at about 275 when I get into town with traffic that goes right up to 300 to 320 fairly quickly. Their You can email to cancel un-shipped/un-paid items at any time as long as they are not direct-shipped, special order or made/machined-to-order. or broken fan belt), Oil Pressure. On a air cooled engine, all you can do it postpone blown head gaskets. Partially clogged fuel injector:If ROP mixture, elevated EGT and CHT on affected cylinder. Filters and sorting. Busses tend to run much hotter temps due to the load they are pushing. Never checked compression though. It does vary a lot with the ambient temp. If the pilot had had a CHT, an expensive repair could have been avoided. not line up with the cooling fins on the cylinder head. *** Supply-chain disruptions have hampered our ability to acquire/restock items reliably, and a lack of backorder ETA information is the frustrating "new normal" for our hobby. cylinder head (which is not always possible on some engines). Most light aircraft engines are air cooled: air is drawn into the engine bay through inlets in the cowling and directed over the cylinders by a set of baffles. Click to download the VDO installation guide in .pdf format. Please do NOT rely on PHOTOS while shopping as many of our products have selectable product options that may change the nature of the product being ordered compared to the representative photo. Nut M6, Various uses [10] N0111165 . It's the only one in this price range that provides accurate digital readouts (in fact it's the only accurate gauge in this price range, including traditional analog models like VDO). (assuming it was installed under the #3 plug, so you can compare it to others with the same install location). For more information on the new gauge, other specialist gauges or our range of SMITHS-branded instruments, pleasecontact us via: You can also follow us on social media for regular news updates, photographs and technical information: Posted by Paul Fears on They simply indicate that a lot of energy from the fuel is being wasted out the exhaust pipe rather than being extracted in the form of mechanical energy sent to the propeller. The external surface of each cylinder is fitted with a number of fins, which act as heat sinks, dissipating the heat into the air. And we will continue responding to emails through until early March 2023 because we are wholly committed to resolving any other issues that may arise from previous sales. This causes ppto occur later and CHT to decrease. Once you go above 400F on an aluminum moped cylinder you start risking an engine seize. Recommend making a plate of thin metal in the shape of the hose adapter and blank off that hole. less than 70C will have problems with fuel vaporization which is necessary for efficient combustion. because this type of tape quickly smears black goo after it has sat a while. In most cases we are able to honor advertised price, but in the RARE case a substantial price increase occurs, you would be notified and given the option to cancel. or 9 o'clock position. The short answer is that your maximum head temperature (away from the cooling coils) would be 500 degrees max (probably). Youre overthinking it, the bike is most likely fine. Our ability to respond to emails is greatly hampered by being under-staffed during this downsize transition time. around 400F, and we can't say this is wrong. I'll have to keep relying on common sense.. somewhat off topic, but when you were running this, what sort of numbers were you seeing? The Cylinder Head Temperature Gauge measures the temperature of the cylinder head of an engine, commonly those that are air-cooled. The cut is in line with the spark plug hole and perpendicular to the two duct The location shown here is the best and will result in the least wear and tear on the sensor wires. Head Temperature, Oil Temperature, Voltmeter (charging system problems This probe is not compatible with the thermocouple probes required (for the EDM)". Since even a badly burned valve permits only a tiny amount of gas leakage, the EGT increase caused by a burned exhaust valve is usually quite small (typically a 20F to 60F rise of a 1400F to 1500F EGT) and quite easy to miss unless you really pay attention. 0 of 0 people found the following review helpful: 1 of 2 people found the following review helpful. By contrast, high EGTs do not indicate that the engine is under excessive stress. For example, advancing the ignition timing so that the spark plug fires earlier causes ppto occur earlier and increases CHT. 200C is 392F. Install an Oil Temperature . If LOP mixture, reduced EGT and CHT on affected cylinder, and possible engine roughness. VDO 250-1650F Pyrometer Temperature (EGT - Exhaust Gas Temperature) Gauge, Cockpit, Black Face, 2 1/16", V310953. Pilots must know the maximum running temperature of their engine and not exceed it. gasket that is on all spark plugs. The one-third that actually makes it to the propeller is reflected on another cockpit instrument: the airspeed indicator. Clear 4 Digit RED Led Readout. . The Evans VP-1 and VP-2 Volksplane plans (which assume a hand-propped engine) call for just a tachometer, oil pressure, and oil temperature gauges. OTOH, if you have a CHT gauge and it's listed as required in the aircraft paperwork, then you have three choices: 1. ring, and cylinder will experience much greater wear. Be very careful not to twist the sensor/wire assembly when tightening the spark plug. Less fuel, more air creates a lean condition and be severe The piston ring lands got so hot that they separated I have yet to see any Top 80 get even close to running the max also easily visible on the side bar. That is because the extra power produced by the Jaguar CDI (from not allowing any misfires due to weak spark) produces more heat. wiring harness, and the sending unit, you do not have to purchase these Re: CHT sensor on an air-cooled engine help. engine running temperature very quickly whereas a CHT can take 20 seconds to register a change. A Cylinder Head Temperature gauge is the missing gauge on any air-cooled vehicle. If you wind the pickup a bag tie, as here, but this is not necessary. the form of droplets will not burn in the cylinder and just pass through. With the engine completely warmed up, grab the dip stick and pull it out. Remove the spark plug and cover the hole in the cylinder with a piece of masking tape. . Using this website means you're happy with this. The advantage of an EGT is that it detects changes in easier to remove the faulty gauge if HST is not used to cover both wires. CHT (cylinder head temperature) gauge w/probe, 2", new, $90 EGT (exhaust gas temperature) . As the temperature increases Highly accurate and durable thanks to AutoMeter's patented air core meter movement, a single wire, 1/8" NPT temperature sender is included. PRODUCT INFORMATION: All information provided by Aircooled.Net (via website or email) is for USE AT YOUR OWN RISK. Also note the charred and failed Megasquirt 2 / Microsquirt / Microsquirt module, MS2/Extra, MS2, Microsquirt and Microsquirt module support, Re: CHT sensor on an air-cooled engine help. 1996-2023, Amazon.com, Inc. or its affiliates, Auto Meter 4336 Ultra-Lite Electric Cylinder Head Temperature Gauge, FARIA BEEDE "12819 Euro Cylinder Head Temperature Gauge with Sender (60-220F) - 2"", Black, Auto Meter 3336 Sport-Comp Electric Cylinder Head Temperature Gauge, Faria 13009 Coral Cylinder Head Temperature Gauge with Sender (60-220F) - 2", Black, Trail Tech 742-ET3 TTO Temperature Digital Gauge 14mm CHT Sensor, AUTO METER 2259 Electric Cylinder Head Temperature Sender, Universal Cylinder Head Temperature CHT Sensors K Type Thermocouple with 18mm Inner Diameter Washer & 10 feet Cable, CHT Sensor Cylinder Head Temperature Gauge Probe Under Spark Plug 14mm Washer Thermocouple, KOSO BA003245 Mini 3 Cylinder Head Temperature Meter, Walker Products 211-1119 Engine Cylinder Head Temperature Sensor, Universal Cylinder Head Temperature CHT Sensors K Type Thermocouple with 10mm Inner Diameter Washer & 10 feet Cable, Faria 13806 Chesapeake Cyl Head Temperature Gauge with Sender - White SS, 2", Standard Motors TS605 Cylinder Head Temperature Sensor, Car Cylinder Head Temperature Sensors K Type Thermocouple with 14mm id Washer Angled Bend, Combo Gauges for Diesel Trucks & Performance Cars, Quality Meters n Instruments at a Great Value, Runleader Digital Inductive Hour Meter for Mower, Automotive Replacement Water Temperature Gauges, Automotive Performance Water Temperature Gauges. IMPORTANT GAUGE YOU CAN HAVE ON YOUR VW! The max oil temp is 261F. A Cylinder Head Temperature Gauge (CHT) measures the temperature of an engine's cylinder heads. I put it on there for low speeds through hot areas. air cooled aircraft engines go up to a minimum of something in the 425F range which is about 218C. Millions of air-cooled VW cars got by with just oil pressure, oil temperature, and generator/alternator warning lights and little else. Itinerant Air-Cooled. This is one reason why I consider an engine monitor to be required equipment in any airplane I fly and you should, too. PORSCHE PARTS & BOOKS; MERCEDES PARTS; EMPI; Wescom Tractor; Workshop; About; Clearance. Cylinder Head Temperature (CHT) Limits According to the engine manual, the maximum allowable cylinder head temperature (red line limit) is 500 degrees F. Lycoming states flatly that the maximum redline cylinder head temperature limit must never be exceeded. Check your owner's manual for the maximum operating engine temperature. Radiators for liquid cooled engines, new, $250 Propellors: Ultra-Prop nylon composite, 3-4 blades (on sale): from $380 IVO Prop carbon fiber: from $600 Generic 2-bladed wooden: $279 new . Sorry! by steve74baywin Fri May 27, 2011 6:45 am, Giving y'all first crack at this before I put an ad on. As things heat up even more, the piston will seize and the engine will stop. Sell now Shop with confidence eBay Money Back Guarantee Get the item you ordered or get your money back. The use of VW, Volkswagen and any model names and numbers is for the sole purpose of description of parts application. You are using an out of date browser. The CHT gauge on a TCMengine usually has a green arc from 200F to 460F, with a red-line at 460F. Cylinder Head Temp Sensors. If your bike doesn't come with a temperature gauge, you can buy an oil temperature gauge or cylinder head temperature gauge. In addition, the piston, manufactured outside the U.S. and the temperatures specified are always given in centigrade. AIR TEAM - Aircraft Parts & Pilot Supplies. Anything that causes ppto occur earlier (i.e., closer to TDC) in-creases CHT, and anything that causes ppto occur later (further from TDC) decreases CHT. This is THE MOST IMPORTANT GAUGE YOU CAN HAVE ON YOUR VW! That's more concerning and being hopefully handled by a small oil cooler and a switch from 0W-40 to 20W-50 Mobil 1. If they are mounted on the upper sticks, for example, you will have to turn your head quite a bit to read them. There are cylinder head temp and oii temp gauges made for air-cooled VWs that would work. The new Cylinder Head Temperature Gauge is the latest new instrument developed by the Caerbont Automotive Instruments' design team. The new heads with the new valve seats don't do this so you can drive safely at Freeway speeds and at 400F CHT's. Still constant 450F CHT is scary as at aluminum heads can suffer from that prolonged heat. engine and where the wires are connected to the side bar. How necessary or useful are CHT and/or EGT gauges in this sort of plane? Retarding the ignition timing so that the spark plug fires later causes ppto occur later and decreases CHT. Air-cooled engines have fins extending out from the engine to pull heat away. The art of troubleshooting with an engine monitor is a subject thats so rich and fascinating that Im in the process of writing a book about it. Sigma-Tek. I gave this a good deal of thought with my 82 air-cooled, which I really cooked for fun one day in August on the way to Vegas. The Minari Peak EGT occurs at approximately the stoichiometric (chemically correct) mixture of 14.7 pounds of air for each pound of fuel, at which there is exactly the right amount of oxygen to oxidize all the hydrocarbon chains in the fuel. and melted causing the ring to become loose (3rd photo). 24" extension lead #V300-24(The extension MUST be These will be the subject of another article. Fouled or malfunctioning spark plug or ignition wire:Elevated EGT on affected cylinder only (usually by about 50F or so). Always do a thorough test of the fuel delivery system before assuming there are ignition or The Cylinder Head Temperature Gauge measures the temperature of the cylinder head of an engine, commonly those that are air-cooled. As you know I am changing my engine from an air cooled to a liquid cooled engine. 2023 Caerbont Automotive Instruments Ltd, Classic SMITHS Speedometers, Tachometers and other gauges, New SMITHS International Dual Needle Boost Gauge. "Most factory installed cylinder head temperature gauges utilize a bayonet or screw-in resistive type probe that occupies one of the bayonet sockets. Would you own a car that did not have an odometer nor a temperature gauge? Whats important is the relative value of EGT for a particular cylinder compared to that cylinders peak EGT value. RePower. CHT (Cylinder Head Temperature) is often monitored on air-cooled engines because there is no coolant. must have the sensor at the 8 If all you have is the factory CHT gauge, then all you know is the CHT of one cylinder (and only very approximately at that) you have no idea how hot the other five are running. Matt Cramer -1966 Dodge Dart slant six running on MS3X. Having an engine run a bit cool (rich) will not do any harm. Aircooled.Net, Inc. is in no way affiliated or associated with Volkswagen AG or Volkswagen ("VW") of America. Note: the stock wire on the CHT is short so This is THE MOST IMPORTANT GAUGE YOU CAN HAVE ON YOUR VW! NOTE:In extreme cases of fuel starvation, a CHT may not be helpful because there is so little fuel reaching the engine that it will not even run. We feel critical temperatures are 425F when You should establish a target CHT that represents the maximum stress you want to place on your engine 380F works well for most Bonanzas and Barons under typical conditions and then adjust your power settings, mixture, and (if applicable) cowl flaps to ensure that all cylinders are operating at or below that target. It was running like a diesel-auto ignition. These gauges are best used as a REFERENCE, get used to them, and if you see it "too high" one day FIGURE OUT WHY! unfortunately they only read up to 125deg, but somethign similar would be ideal Engine Guard - Product Overview - Engine Guard basically this.. "cylinder head temp gauge" VDO 12v DIGITAL CYLINDER HEAD TEMP GAUGE KIT 4WD TRUCK | eBay failure of the side bar while flying could be catastrophic. There must be a loop in the sensor wires (as shown) so they can flex with the up and down movement of the side bar. CHT mainly reflects whats going on in the cylinder during the Otto cycle power stroke before the exhaust valve opens, while EGT mainly reflects whats going on during the exhaust stroke after the exhaust valve opens: High CHTs generally indicate that the engine is under excessive stress for its own good. Slightly reduced CHT on all cylinders. It might be easier to put a CLT sensor in the oil. The use of these terms in no way denotes or infers a direct or indirect connection between Aircooled.Net, Inc. and Volkswagen or any of its subsidiaries. Engines cooled by air rather than water require a steady and constant flow of air and accurate temperature monitoring is critical as overheating can cause engine failure. for Spark Plug M14 919 085 113C available from stock. While a CHT gauge can also give an indication of mixture strength, it will be slower to react than an EGT gauge because the heat must travel through the mass of the cylinder head. When a CHT gauge was offered at the factory (I think on microbuses only) it was just one sender on one head. Of course, if pilots have lots of money and like ignorance, who would care? If you use HST, Trail Tech will continue to invent and develop improved, quality products for the benefit of the Power sport community, CHT (Cylinder Head Temperature) Sensor for air cooled machines. Limiting EGTs accomplishes nothing useful. wheres the evidence to say that that bicycle caught on fire due to excess head temperature? If I had a 2.0 air cooled engine, I would want to monitor exhaust temp more than head temp. If needed, pilots may contact us to order these washers ($1 + free shipping). float-type carburetor which is easy to adjust in the midrange, unlike diaphragm carburetors, and going lean in the midrange is very easy The CHT wire is delicate and Northeast - Middletown, PA b.) In all the air cooled motorcycles I've tested at work I would say that, in general, under heavy load conditions 230-250 degC is an acceptable plug temperature. Our site uses advanced code and encryption that is not supported by Microsoft's Internet Explorer Browser. Air cooled aircraft engines (which always have CHT gauges) typically have maximum allowable Cylinder Head Temperatures of around 350-375f (about 175-185c) which is well above the boiling temperature of water. Join Date: Jan 2011. I didnt turn that fan on. This piston from a Top 80 came within moments of completely burning through. It is also good to have an hour meter/tachometer so Denser air increases the air drawn per stroke, once that air reaches engine temp. make holes in the wings of the tachometer so it could be mounted properly. . Westach. The gauges are CoC. 80 mm. Cylinder Head Temperature GaugeGaugeNew Product, Categories: The excess tachometer wire and the excess CHT extension wire can be secured to the frame with nylon zip ties. Note: the 10mm sensor is easily deformed by the small diameter spark plug. FAA. A properly installed CHT gauge can help prevent this sort of catastrophe and prolong the life of your engine. of how your engine operates in various conditions, which is important! Busses tend to run much Midwest - West Chicago, IL Sender installs over the engine spark plug, typically on cylinder #3. Some air-cooled engines may also have ducts around the engine to keep air flowing . But we continue to endeavor to answer email inquiries as best we can. Microsoft has retired Internet Explorer in favor of their new browser- Microsoft Edge, or you can use Google Chrome or Mozilla Firefox. This set up is intended to help the rider maintain engine temperature in check while pushing it to the extremes. The gauge compliments the extensive range of new and classic instruments, including those with SMITHS-branding. Confirm by doing an in-flight mag check; note which mag causes affected cylinder EGT to go cold. Also, at higher elevations, you . Falcon CHT 2 Inch Round Gauge. Mike Busch's books, articles, webinars, and other resources from Savvy Aviation, Inc. if it was 100 F outside, your VDO gauge would read 30 F low, you would need to add 30 F to the gauge readout to determine your true CHT; if the ambient temps are colder than 70 F, then the gauge reads high, and you need to subtract the difference from the gauge readout. I just tested a high rpm piston port intake 55cc Grubee engine and I redlined it for a mile at 9100 rpm and it only got up to 425 degrees farenheit. This gauge kit comes WITH the The pilot of this engine supplied as with the gauges. Prevent damage to your engine and ensure maximum performance and reliability with this AutoMeter Electronic Cylinder Head Temperature Gauge. mounting points. point. Important: The absolute value of EGT is not important. THE SENSOR MUST BE ORIENTED SO THAT THE FLAT AREA OF THE SENSOR ENTIRELY CONTACTS THE FLAT AREA AROUND THE SPARK PLUG HOLE. K & N Air-Fuel . Additionally, paramotor engines are designed mechanically to run at a specified temperature VDO Cylinder Head Temperature (CHT) 14mm Sending Unit, V323701 is used to monitor the critical Cylinder Head Temperature on the Aircooled VW Engine. ), . . Use the drill bit or reamer to widen the holes in the gauge so that the ties will fit through the holes. You can find out more about the cookies used by clicking this link. the "engine guard" products you see advertised on TV, use a washer temp temp sensor. Discussion in 'Thumpers' started by Modron, Apr 11, 2016. One of our engines at Southwest Airsports has an EGT but it has a I very seldom refer to EGT when I lean my engines; I use fuel flow to get somewhere in the ballpark, and then fine-tune by reference to CHT. Racer71 Pro Posts: 276 Joined: Mon Jun 24, 2019 4:36 pm The Minari and Air Conception have a horizontal engine so the extension is not needed.