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Old 09-24-2005, 11:26 AM   #1 (permalink)
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Default Symptoms/Consequences of bent valves?

Hey guys, can someone just give me a basic rundown on what the symptoms/consequences of bent valves? I know the basics but I just want to confirm my problem. Mainly, what kind of compression have people gotten with bent valves? Also, what did results of a leakdown test reveal? Obviously I'm gonna have to reubuild or replace my heads if this is the case. Thanks in advance for the help.
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Old 09-24-2005, 11:29 AM   #2 (permalink)
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Default Re: Symptoms/Consequences of bent valves?

Don't you only have like 30 thousand something miles on your car? What happened to it?

And isn't Sean down there too?
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Old 09-24-2005, 11:32 AM   #3 (permalink)
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Default Re: Symptoms/Consequences of bent valves?

Quote:
Originally Posted by DaveSlow
Don't you only have like 30 thousand something miles on your car? What happened to it?

And isn't Sean down there too?
62K, 2 weeks ago car was in perfect shape

Yes.
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Old 09-24-2005, 11:37 AM   #4 (permalink)
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Default Re: Symptoms/Consequences of bent valves?

Quote:
Originally Posted by VR4Rob
62K, 2 weeks ago car was in perfect shape

Yes.
ahh gotcha, for some reason I thought yours was the one on the board with 3xK miles on it cause it looks that clean. sorry for the OT but since seans down there how come u dont ask him?

edit. Just talked to you on aim, questions are redudant

Last edited by DaveSlow; 09-24-2005 at 11:46 AM.
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Old 09-24-2005, 03:32 PM   #5 (permalink)
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Default Re: Symptoms/Consequences of bent valves?

Bent valves leads to blow by, aka your car will seem like its hittin the bob with the smoke coming out of it..espeacilly when you get off the gas....
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Old 09-24-2005, 03:46 PM   #6 (permalink)
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Default Re: Symptoms/Consequences of bent valves?

Bring it up to TDC for that cylinder which is effected and pressurize it wih air. If you hear noise coming out the air cleaner it's intake. If you hear it coming out the exhaust it's your exhaust valve. If you run around with an exhaust valve leak you'll probably burn a valve. If you run around with an intake valve leak you will reek havoc on the intake track as the pressurized air is pushed back out when the piston comes up to on the compression stroke.
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Old 09-24-2005, 04:07 PM   #7 (permalink)
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Default Re: Symptoms/Consequences of bent valves?

bent valves will happen if all 12 intakes go bye bye. you will get 0 compression even with the leak down test. here is how you see it for sure (see) remove teh intake plenum and the lower plenum and you should be able to see the bent valves. some how the gaps on top of the piston in the intake side is not deep enough and they spank the intake valves when timing jumps. exaust are fine. also you might be thinking if you ddamaged the piston tops.....well lucky you they are fine but you can see where the valves hit them. thank god to all the valves being made soft enough to bent on contact with the pistons. hopefully it helps
later,
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Old 09-24-2005, 04:57 PM   #8 (permalink)
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Default Re: Symptoms/Consequences of bent valves?

Thanks for the replies guys

Is it possible to bend valves if a car is repeatedly tried to be cranked when the car is timed incorrectly?

Also, if this happens, could the cylinders build a very slight amount of compression (50-80 psi) if the valves are only very slightly bent?

Results of the leakdown test seem to indicate dead intake valves...
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Old 09-24-2005, 05:28 PM   #9 (permalink)
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Default Re: Symptoms/Consequences of bent valves?

It has to be the valves.

air coming out of the lower intake plenum AND coming out of the other spark plug holes on the same head, It can't be anything else.

I'd say cracked pistons, only the air is only coming through the spark plug holes on the same head, not through the other bank.

Only way we can know for sure is have David rip the heads off and find out.
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Old 09-24-2005, 07:22 PM   #10 (permalink)
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Default Re: Symptoms/Consequences of bent valves?

Hope you get 'er fixed soon, Rob.
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