It was a bent valve
Thread Starter
Safety Car
Joined: Aug 2001
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From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
It was a bent valve
After trying a few tuning ideas I did a compression check on #1 and the gauge did not move :nonod: So I pulled the head off and the exhaust valve is bent. I talked to the guy who does my head work and he said he can have it done today.
Thread Starter
Safety Car
Joined: Aug 2001
Posts: 3,892
Likes: 13
From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
Re: It was a bent valve (542C2)
Hey Steve,
See my post about wierd valve trane issues in this (engine mod) section. It is about half way down the page.
See my post about wierd valve trane issues in this (engine mod) section. It is about half way down the page.
Team Owner
Joined: Apr 1999
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: It was a bent valve (69 N.O.X. RATT)
The only way to bend a valve is piston impact. Valve float is very destructive. Generally todays forged pistons have such deep out of the box valve pockets that you would have to have massive lift before you even have to worry about piston/valve clearance issues.
If you had the motor/heads proffessionally done I'd be on them about inccorrect spring pressures. The other thing is good sequential misfire rev limiters are worth there weight in gold. I like my Crane 6-R
If you had the motor/heads proffessionally done I'd be on them about inccorrect spring pressures. The other thing is good sequential misfire rev limiters are worth there weight in gold. I like my Crane 6-R
Thread Starter
Safety Car
Joined: Aug 2001
Posts: 3,892
Likes: 13
From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
Re: It was a bent valve (gkull)
George, see the same post I referred Steve to, it was sorta a freak thing that happened. You correct about the piston to valve contact issue.
Safety Car
Joined: Mar 2002
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From: Southwest MI
Re: It was a bent valve (gkull)
The only way to bend a valve is piston impact. Valve float is very destructive..........The other thing is good sequential misfire rev limiters are worth there weight in gold. I like my Crane 6-R
AND regarding the rev limiter, I totally agree! , great investment if you're going the race (you know how it is during the "heat of battle" :-)
:seeya
[Modified by 66427-450, 2:19 PM 8/22/2003]
