VelodromeRacer
Jedi Trainee
Offline
Hey all.
I am chasing an issue with the motor. I added a speedwell Alum. radiator and have a 1275 engine with 1-1/2 Su carbs.
At Mid-Ohio, I could run only a few laps and she hit 210..and spiked even higher! We retarded the timing back to 28 degrees..The plugs on the rear carb are showing way to rich as well. We did a leak down test from 100 psi and it shows 5% loss for number 1 and 2% for 2-3 and 4. I need to do something as I am set to run at Road America in under 2 weeks and this is starting to get very troubling! I run a new Distributor from APT Fast with the Petronix and I have an oil cooler. The oil at Mid Ohio during the race at 5pm last Sunday hit 230 which it never gets to. Could it be a leak in the head that opens when it gets hot? Ideas? Kent Prather did help tune the car some at Mid-Ohio and we went from BG to number 6 needles for the carbs.
I am chasing an issue with the motor. I added a speedwell Alum. radiator and have a 1275 engine with 1-1/2 Su carbs.
At Mid-Ohio, I could run only a few laps and she hit 210..and spiked even higher! We retarded the timing back to 28 degrees..The plugs on the rear carb are showing way to rich as well. We did a leak down test from 100 psi and it shows 5% loss for number 1 and 2% for 2-3 and 4. I need to do something as I am set to run at Road America in under 2 weeks and this is starting to get very troubling! I run a new Distributor from APT Fast with the Petronix and I have an oil cooler. The oil at Mid Ohio during the race at 5pm last Sunday hit 230 which it never gets to. Could it be a leak in the head that opens when it gets hot? Ideas? Kent Prather did help tune the car some at Mid-Ohio and we went from BG to number 6 needles for the carbs.