[urq] Re: 80tq: Blown Engine > Dropped Valve

JShadzi at aol.com JShadzi at aol.com
Mon Dec 8 10:27:29 EST 2003

Hey Mark, yes, its quite common, Bernie's is the only intake valve I've seen, but that was really a vavle keeper failure, not a valve failure.

Yes, NG intake valves, which requried a new valve seat, valve seat area was not reduced from stock, and the exh. valve seats were untouched.

>From now on, if I built up a heavily used 10vt, I'd use Inconnel Exh. valves, no question about it, I'm not sure what caused it specifically, its hard to say at this point.


>> http://www.80tq.com/albums/?mode=album&album=EngineFailure&dispsize=640&start=
>> 0
>wow, that's almost as ugly as the guy who ran a container of bbs through
>his miata(?) motor.
>So it seems that dropping a valve on a 10vt is fairly common... and it
>can be either the intake or exhaust.
>If I remember correctly, you were running 40mm NG intake valves right? 
>Since you dropped your exh. valve at least we can conclude(?) that the
>reduced valve seat area required for the bigger valves doesn't make the
>assembly any weaker than the stock exhaust valve....
>Let us know if you discover anything else that would indicate the cause
>of failure...
>87' 4ktq
>88' 90q

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