Are you sure that the valve spring or the keeper didn't give up first and let the valve drop into the cylinder ? ----- Original Message ----- From: Bob Bundy To: [email protected] Sent: Wednesday, February 18, 2009 12:06 AM Subject: broken valve.
Anybody ever have an exhaust valve just break? see attached pictures. this was my backup motor, stock 95 bottom end with stock 99 head. When it failed at the track my initial thought was something wigged out with fuel control and it went lean and burnt a piston, even though I had run it in 5 prior 20 minute sessions and watched wideband readings and wasn't recording knock, but looking at this now it looks more like the valve just broke and pummeled everything. I had switched from the 2L which was consuming Oil and didn't really spend a lot of time re tuning. I just turned down master fuel and it actually didn't seem that bad other than it felt like it was making a good amount of power at 17psi. judging by my lap times and strait speed it had to have been around 300hp to the rear wheels. This took out the GT3071R turbo with it. chunks of piston turned into molten aluminum in the turbine housing and destroyed the turbine wheel as well. $$$$$ Bob ------------------------------------------------------------------------------ _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
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