For those that don't know, the engine in my STI was destroyed back in May, not long after it was built. It was a standard 2.5L build, 100mm CP pistons, Pauter Rods, stock crank, minor head porting work, supertech valves+valvetrain, and cosworth cams. I was running a custom 35r kit and FMIC made by Synapse Motorsport in Scotia.
Junior at The Shop CT tuned it and it made 543whp on 93oct at 23-24psi and 614whp on VP C16 at 27-28psi. Actually it wasn't picking up any more power over 26psi and we figured the turbo was maxed out... 26psi was 611whp and 28psi was 614whp.
I made a couple quarter mile passes, one full run on Sunoco 116 with a blown out header gasket netted 10.7 @ 132. I made four full passes on the 93oct map - 11.4 @ 124, 11.0 @ 124, 11.1 @ 121 (blew out another header gasket), and 11.0 @ 124 again. Then the whole fucken motor grenaded. It had 5k miles on it.
It dropped a valve while rolling away from a stoplight by the carwash on central ave. Pretty much everything was destroyed, the only reusable parts were the cams, headstuds, and the rods although the rods need to be reconditioned. Three valves dropped into cyl #4, things got good and mashed up, and parts went back through the intake manifold into the other cylinders.
Ron @ Raw Performance built the motor so I had Synapse pull the motor and send it back to him. He uhh, turned into a dick. Two weeks after he signed for the delivery I called him and he said "Oh I just received it, I'm opening up the package now". He called me after he got the heads off and said that he'd tear it the rest of the way down, send me pics, and call me to discuss next steps. Two weeks later he sent me an email asking if I'd decided what I wanted to do yet... I was like yeah, you were supposed to send me pics and call me.
He told me that flat foot shifting was destroying the rod bearings, that Synapse contaminated the oil when installing the engine, and that the valveseats fell out of the heads because Applied Flow Technology installed them incorrectly. Actually he blamed Synapse before he ever tore down the bottom end which is total BS since there was no evidence on the bearings of oil contamination. He then offered to sell me a new engine, and I asked for all the parts back.
Here are the pics from Ron
When I got the parts back Junior and I put the #4 rod back on the crank and there was a ridiculous amount of side clearence on the rod. Which explains why the rod bearings are only worn down on the outer edges and not in the middle - they were bouncing back and forth cause Ron never checked the side clearence. The cap side of the bearings was just as bad. Now if FFS and knock was tearing up the bearings why would the cap side of the bearings be all torn up, and again only on the outer edges?
As for the valves dropping, Junior thinks that the seat broke and fell out because there was too much seat pressure (another thing Ron didn't check) but I kinda think that it was because my exhaust valves were not made from Inconel. Supertech actually tells their customers now not to use SS exhaust valves in turbo motors even though they still sell them.
New build info is in the next post...
Topic: Another engine build for my STI. (Read 3235 times)