Originally Posted by
1QwkSport2.5r
A lapped engine usually won't exhibit the compression loss when hot like an ABC engine will. How does the engine feel when turning over cold and then turning over hot? Will it do the same thing if the HS needle is set a fair bit fatter? Did you read the glow plug? Try a new glow plug? Head bolts still tight?
I suspect that it might have leaned out in flight. I had it running extra rich later because I could tell it was getting quite hot even though it worked well with that setting before. At first when it started acting up, the glowplug got scortched, looked like the coil got scrambled. I replaced it with a new plug and ran it rich(er). It would run normally for about 2-3 minutes at WOT and then suddenly quit, regardless of HSN setting. The idle and transition worked well. When hot, there was practically no compression. But when cold it has a good "pop" from compression. I checked the head bolts and were on tight.
Distraught in Detroit
