MattSet

I agree. I have readjusted my governor today and have it set right on 2700. Taking it back to my mechanic to increase fuel flow. I am assuming 25 gph is correct for these. I am showing 23.6 gph right now

It was a learning curve for me for sure. But the main issue I had was. Bad fuel pump not flowing what it should at take off. Once I replaced it and set the prop governor to the correct setting. It’s been a breeze to keep CHT’s under control and I have really enjoyed the plane since. What I had was only 19.6 gallons per hour of flow at 37” and 2500 rpm. Causing CHT’s to be high on takeoff. But now I run 37” and 2650 instead of 2700 (I like that for max rpm and be a little conservative on rpm) with about 23.5 gph and the hottest cylinder #2 never gets above 440 on takeoff. After take off. Drop it back to 2500 and 32” and once up to pattern altitude I drop back 2300 and 25” with temps in the 360 range. It will run fine at 20” and super economical. Or you can run up to the low 30”s range and get some real speed. But any of those power settings and the temps stay normal with higher air flow over the cooling fins with speed. So just be sure your fuel pump is set up correctly and you will be fine.

Update. Mine has a bad fuel pump. It was showing 5 gph lower then normal, 19 gph at take off power. Attempted to reset flow and the pump would not increase and had some strange fluctuations. New one just came in and setting up flows now.

Mine has a bad fuel pump. It was showing 5 gph lower then normal 19 gph at take off power. New one just came in and setting up flows now. Glad to have this read just in time.

Just letting everyone know Jet Shades now has the pattern for the M20K if anyone has an interest in them.

Thank you all for your input. We tested compression again. All in the low 70’s. Borascoped the cylinders and the A&P said they were the cleanest he had ever seen and found no issues with valves or with anything in them, guess running it hot for a few seconds on take off burned out any carbon LoL. After careful review we have tested and found no issues with fuel flow for each cylinder, all even flow from the spider and decided to order a set of Gami injectors to even out cylinder temps and to keep the manifold pressure 36-38 on take off.

I believe you are correct. When it felt like water in fuel, rough running. I noticed manifold pressure at 42 and said to my pilot. Manifold is 42. He reduce throttle and got it below 38 and the roughness cleared up quickly. He said he wasn’t watching it as he thought the auto waste gate would handle any over boost. We were in climb out in a critical area. Once up safe to an altitude he reduced it more. But it took 25 to bring all the temps to normal.

Not that I know of. I checked the engine monitor I have and it does not down load. That was the first thing my pilot and I tried to do. But she is a little dated for that. Definitely planning to update her. Just need to get her home safely first

Yes. It has an Automatic waste gate. I did not take note of fuel burn and the other cylinder temps were running about 50 degrees less. I also engaged low boost fuel pump on takeoff

Long story short. Purchased a 1982 M20K 231 with an intercooler and automatic waste gate. Annual complete. Plane has not flown for 2 years. But on first flight. At 100 feet over a short runway. Engine had a bad vibration like water in fuel, cleared up after a few seconds but sure got my attention. Manifold pressure on take off was 42. Backed it down to 35. Cylinder temps very high. Number 2 reached 498. Backed manifold pressure down to 25 before able to cool the temps to normal ranges. With number 2 still the hottest at 380 or so. Decided to circle airport and land. Question is. Would not the automatic waste gate keep the engine from over boosting? If working properly. And why would the cylinder temp still be very high at 35 inches pressure and had to drop to 25 to bring temps back to normal. And this was on a 35 degree day. Yes during annual, removed and cleaned all injectors. Also. Who is the best A&P for this type of issue in the South east.