robjahnke Posted February 17, 2021 Author Report Share Posted February 17, 2021 Thanks Roger. So is a 250 F split between the front and rear cylinders at 4600 RPM a problem? There is less than 50 F difference between all cylinders at WOT. I think it depends on what is causing the split at lower RPM that matters. That is what I was trying to get people to explore with the PUZZLE question If we were to understand what causes that phenomenon in the Rotax 912, we could better judge if there is anything we could/should do about it. If it IS a problem, it is easily 'Solved' by running at 5000 RPM. Rob Quote Link to comment Share on other sites More sharing options...
Jim Meade Posted February 17, 2021 Report Share Posted February 17, 2021 By-the-way, for those in the upper midwest, My go-to guy on Rotax questions is Brett Lawton of Leading Edge Air Foils in Lyons, WI, southwest of Milwaukee. tech@leadingedgeairfoils.com or 800-532-3462 ext 154. Very competent, knowledgeable, good with troubleshooting and a pleasant fellow to work with. Leading Edge, is one of the big Rotax distributors, along with CPS, Lockwood, etc. I've always been happy with their support and work with Rotax. Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted February 17, 2021 Report Share Posted February 17, 2021 250F is way to far out. There are several things that could cause it. Normal is anywhere from 15F - 80F. Rotax considers anything at the 15F mark the same temp. When temps are up in the 1250F - 1500F 15F is nothing. Give me a call. Brett's my go to guy for odd and weird problems. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted February 17, 2021 Report Share Posted February 17, 2021 250° is the difference between front and rear cylinders. He is within about 50 side to side. I have not seen a 912 ULS powered CT with 4 position EGT probes, so I have no idea what normal is. I suspect what he is seeing is normal for the CT, and has to do both with the engine and installation designs. Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted February 18, 2021 Report Share Posted February 18, 2021 We had a nice talk on the phone and a far better understanding of what was happening and all the other details. I misunderstood the first post. What he has is normal. Quote Link to comment Share on other sites More sharing options...
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