Scott Hersha
Well Known Member
My O-360-A1A powered RV6 has a 10-3878 carburetor. Last month I read an article by Vic Syracuse (don’t remember which publication) about two RV6’s he was working with at His Base Leg business. Both of them had issues with high CHT’s. There were a couple problems that could cause this. One was ignition timing, but both of them had the 10-3878 carburetor. Vic said that the correct carb for our airplanes should be the -4164 - larger main jet, among other things. I believe he upgraded those two RV6’s to the -4164 carb, and they saw a marked improvement (I think). I have a fixed pitch Sensenich GA prop on mine. At full takeoff power, once airborne I’ll see 2250 RPM, ~28-29” MAP until I pick up some speed, but my fuel flow at that full power setting is 13-13.2 gph. On warm days I’ll have to reduce my MAP to 25-26” after I’ve climbed a couple thousand feet to keep my hottest cylinder(s) below 400*. In cruise my CHT’s slowly balance out in the neighborhood of 330-350* depending on OAT. So - question is - for those of you that have gone this route, did it help with high CHT’s, and what other indications have you experienced in other phases of flight? For the engine experts, what would you recommend. Vic - am I right about what I think you said about the -3878?
Thanks
Thanks