Rebuild Runs Rough

nm9stheham said

Cranking pressure comes out right for your altitude and a guess at the ICA.

What has changed from the last build? Is the turbo new/different? Cam new/different?

LSA looks typical for a turbo cam.

How many cc's do you think you removed in the heads?

If all of the engine is the same, and fuel is the same, then just sounds like an ignition or sensor issue.

Click to expand...

Only major things changed were the crank, the crank bolts are now studs, the oil pump, and I did multiple oil system mods. Ported all the holes and made the oil pump pickup a custom larger diameter pipe. Oil pressure is nice and happy. No valvetrain noises. I inspected the oil filter after 30 min run. Just some residual metallic fuzz, no chunks or slivers.

I also did all the unshrouding and cleaning up the edges of the combustion chamber. I think I removed 3-4cc total from the chamber and block. I cleaned up the intake ports and matched them to the heads. Everything else is the exact same before the thrust bearing failure.

Cam IVC is 42

Yeah I’m thinking the crank trigger may be at fault. It seemed a little eccentric on the pickup when setting the gap. Maybe play with the noise filter. Surely something is making it run poorly. With so many changes, I just pray it isn’t anything engine mechanical. From the compression test, I really don’t think so.