- Joined
- Jan 29, 2018
- Messages
- 78
- Reaction score
- 42
I have a 1967 pa32 260 with a carbureted o540 e4b5. Great plane, great engine. I’ve owned it for over six years, engine is strong with excellent compressions. Here’s my issue: cylinder #5, (back right) likes to run hot. Likes to creep into the 400’s on climbout, and on a hot summer day I often have to use carb heat to keep it from climbing higher. (Throttle is WOT, as this I’m told opens an extra jet for more fuel, anything less than WOT will make it even hotter) Oil cooler is directly behind 5, and oil temp likes to creep up into the high 220’s on a hot day in climb as well. In cruise, I run WOT by the book at 2100rpm, as higher rpm will create higher temps in #5. Usually at altitude that works out to be around 65% power. Long story short, according to the book I should be able to run 65% at 12.2gph, but that would put #5 in the 400s. I follow mike Busch’s advice, and keep #5 at 380 in cruise. This results in a 15gph fuel burn. Now on the flip side, to keep #5 happy, #2, (front left I believe) is very cool. On a cold day or at high alt will want to drop under 300. Now if I come back from WOT, that will close that jet and keep everyone more happy, but then I’m not getting my best performance.
Think it’s a baffling issue?
Think it’s a baffling issue?
