ignition · FF-0471

What changed after the first blown pulls on the ARDUN engine?

After the first pulls the boost reads about 5 pounds. The EGTs are not out of control and the air-fuel ratio is really safe; the jets had gone up from 70 and 72 to 74 in the front and from 81 to 84 in the rear, not a big jump in fuel. The call is to put some timing back in, because the race fuel slows the burn down so much and the engine sounds lazy; it really likes the advance.

Expert

Robert King

Evidence

measured

Component

timing and fuel on race fuel

Applicable scope

Steve Coppock's supercharged ARDUN overhead valve Flathead, 8BA block, about 289 cubic inches, with a Weiand 177 on the engine dyno at Klein Engines