We're going to pull the head and take it to portflow and have the head rebuilt. If the pistons and the cylinder walls look good we're just going to slap the rebuilt head back on and hope for the best with stock 180,000 mile block.

 

although dropping in a stock f22 is quite tempting too, but cant exactly make the decisions until the head is off

 

looking forward to seeing pics with the head off get shots of the cylinders at bdc and pics of the valve seats on the exhaust side also measure guide wear

 

Had some time tonight so i pulled off the head. The cylinder walls look good for a engine that has 180,000+ miles on it. I dont see any thing thats messed up but i'm guessing the valve seals and guides are bad. My brother and i have decided to just buy a low millage f22c for his car so he can be up and running by the end of the month. I'll tear his f20c down and slowly start rebuilding it into a low compression fully built f24.

 

Thanks for the pics! Nice to see a high mileage turbo s2k. Honestly headwork isn't that big of a deal. If you decided to fix it it wouldn't have taken much. Maby I just have that mentality because I work on cars a lot.lol

 

Just speaking from experience, if you heard a pop/boom then an immediate loss of power, it's not the 30% leakage in the cylinders that's the problem. Something else happened.

I would imagine something else went. Like maybe the waste gate (hole in the diaphragm), a hole in a coupler, blown out manifold gasket, crack in the manifold, pipe, intercooler, etc.

I have ran my car at that leakage before (not recommended, but we had a race we had to make), and didn't really seen any loss in performance at the track. Yes, you need to address that, as it's clearly not right, but that isn't the problem that you explain and how it appeared.

I would just tread softly at first with the new motor as this issue might still be present.

My 2 cents.

 

X2 my original ap1 motor had different compression ratios(something like 200,180,175,190) and I didn't feel any loss in power and still made over 400 on the dyno. I would go over everything with a fine tooth comb.

 

I agree with this. Similar situation happened to me, and it was the manifold letting go. Double check everything on the exhaust side of the setup for leaks.

 

Thanks for the advice. When I drove the car it was so down on power and it sounded like there was a huge exhaust leak. Although it stilled spooled it felt like it spooled much slower I thought for sure there was a crack In The manifold or some king of exhaust leak before the turbo. But I found no boost leaks in the charge pipe and it found no cracks in the turbo manifold. So I don't know. Looking at the pictures the exhaust port on cylinder ports is cracked with fresh wet oil. So..... What do u think is wrong?