| Re: Does this look ok to you guys? |
Subject: Re: Does this look ok to you guys? by SpectatorRacing on 2011/7/20 14:07:39 The debris is the #4 intake valve seat. It slipped out, got beat up by the valve, and half of it fell into the cylinder. It obviously got mashed around in there for a bit until it collapsed the water passage, which dumped water into the cylinder and eventually hydrolocked the motor. Will you are correct, the failure happened at idle. Although the damage was caused by an extremely lean dyno run the day before. Last week I swapped a smaller TB on to try and choke some HP off and it had the opposite effect. My awesome MAP computer did not add any fuel to keep up with the higher air velocity (volume?) and ran between 14 and 15:1. Too bad the guy didn't look at the AFR before making three passes. But good thing I had him add a sniffer as I've run lean before. My guess is that the heads got hot and the seat may or may not have fallen out at that point. Afterwards, I put the other TB back on to correct the lean condition. I ran a warmup session Saturday morning, and noticed the car running a little funny. It actually seemed more like it was low on gas - hesitation in certain corners, etc. After the warmup I went across the scales and cut the motor. The car wouldn't refire because I killed the battery running the WP and fans while it was off. I jumped it and was driving back to my garage when it hydrolocked and the day was done. It did put down 414 RWHP before expiring  Stock compression, pump gas... |
