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Author Topic:   Help!!!!
Dirt Full Roller

Total posts: 52
posted April 18, 2002 11:51 AM
I need someone to explain a couple things to me as I am apparently an idiot about the how's and why's of an alcohol engine.

Apparently I had a vaccuum leak under the carb spacer that I did not notice. This then caused enough dirt to get into the #5 cylinder to cause extreme cylinder temps and then rightly dropped the exhaust valve seat, thusly dropping a valve and trashing a $6000 + engine. Now my builder wants to put on a set of Track I Brodix heads at $700 for castings and $200+ for seats and guide work, and then replace 4-5 pistons, couple sets of rings, 10 valves (6 were still ok), all told about another $2000, how do I tell what happened? And how do I keep it from happening again? I am very methodic when putting my engine in and do the same things over and over and over, how could I have missed this?

I sprayed carb cleaner around the base plate of my carb on saturday while it was running and could hear no definite rise or drop in RPM, am I just a complete idiot or what could I have missed?

Help, ******* up in So. Illinois!!!!

Dirt Freak

Total posts: 467
posted April 18, 2002 12:13 PM
What type of head did you have on your engine that dropped a seat out ?? Were the original seat's replaced at any time ?? Valve seat's do not just arbitrarily drop out , unless they have a valve stuck sideways in the pocket , or if they were installed wrong . A vacuum leak will certainly not cause one valve seat to drop out of the head ! It should be simple to figure out what happened to your engine , but the scenario that you spoke of sound's extremely fishy !!


Hendren Racing Engines
Rutherfordton , NC

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