Originally Posted By: CNC-Dude #5585
If its built specifically as a turbo engine with low compression and a turbo specific cam, it may be normally doggish until you start blowing air through it. A lot of nitrous engines are that way, especially with real wide lobe center cams along with low compression. Keep us posted!


Compression is 9.1:1, using Tom's medium lift cam, Pertronix ignitor and Holley 390 for the break in. A/F is a little fat, but not overly rich by any means.
What got Ryan's (the engine guy) attention was the fact that during some pulls the engine just laid down at 5,400 RPM. It should rev higher than that and show some sort of power.
Ryan is concerned that the valve springs and retainers are showing phyical signs of valve float.
We are turning our attention to the Harland Sharp Rockers after a valve spring swap this afternoon. No significant improvement with the new springs.
Most of this is way above my skill level, but the man at the dyno has a lot of experience with race engines so I do trust his judgement.

What started out as a quick break in, retorque, and base line pulls has turned into a bit of a project.

Paul


V8 Camaros are like navels, everybody has one.
69 Camaro EFI Turbo 250 project is running!!