Exhaust timing question for the gas motor guys.

David Krienke · Aug 2, 2024

LohringMiller said:
We've done lots of engine testing. I've posted the articles here:
https://www.intlwaters.com/threads/bearing-damage.86987/page-3#post-854833

Lohring Miller

this is the second time reading through these articles and I always feel drained after. Its so much information. I really don't see why the larger thicker top plate sleeve is not standard practice.

Buckshot · Aug 2, 2024

Mike Hughes said:
196 on the 30plus I measured yesterday.

Yikes!

Eddie t · Aug 2, 2024

What is the intake timming? Whats the head clearance?

Mike Hughes · Aug 3, 2024

162ish .015

Drew St. Amant · Aug 4, 2024

The last gizmo motor I had was acting the exact same way then it did this. Ended up being the upper rod bearing failing. I know you said the bearings where new and in good shape but figured I'd share in case it helps.

Daniel's Racing · Aug 6, 2024

Drew St. Amant said:
The last gizmo motor I had was acting the exact same way then it did this. Ended up being the upper rod bearing failing. I know you said the bearings where new and in good shape but figured I'd share in case it helps.

That is from porting the transfers too thin. Follow the crack you will see places the metal wasn't .005" thick and a crack starts there and works it's way around.

See many dozens blown apart caused by a worthless cnc program that is destroying the cylinders needlessly.

You do not have to cut any of that so thin for any reason to get flow through the transfers.