rvbldr3170
Active Member
I posted previously on this issue, but I'm interested in some "real world" answers. I am looking for some feedback from people actually using a Sam James cowl on an RV-4 with an 0-360. Mine is an 0-360 A1A with 9:1 pistons, chrome cylinders, 2 mags, and a carb.
I have been chasing high CHT's since first flight, and I can't seem to get 2 of them down below 400 degrees without drastically reducing power. I have flown when OAT was 40 degrees and I still get high CHT's on #2 & #3. That's the confusing part. The hot cylinders are the left front and right rear (as viewed from the cockpit). I have taken the plenum off and checked and remade the inter cylinder baffles twice. I also verified my CHT probes with boiling water, and they seem to be OK. Is there anything on the exit end of the cowling that anybody has tried with any success? My oil temps are fine (never over 210), and my EGT's seem good with no major spread. I am about to scrap the Sam James cowl and go back to Van's, but I want to do everything I can to try to make the SJ cowl work before I do that.
Sam??
I have been chasing high CHT's since first flight, and I can't seem to get 2 of them down below 400 degrees without drastically reducing power. I have flown when OAT was 40 degrees and I still get high CHT's on #2 & #3. That's the confusing part. The hot cylinders are the left front and right rear (as viewed from the cockpit). I have taken the plenum off and checked and remade the inter cylinder baffles twice. I also verified my CHT probes with boiling water, and they seem to be OK. Is there anything on the exit end of the cowling that anybody has tried with any success? My oil temps are fine (never over 210), and my EGT's seem good with no major spread. I am about to scrap the Sam James cowl and go back to Van's, but I want to do everything I can to try to make the SJ cowl work before I do that.
Sam??