Thread: testing for burnt valves
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04-11-2006 07:35 AM #1
testing for burnt valves
I got a dollar sucked in half by my exhaust so I think I have some burnt valves. Is a leak down test the best way to determine this?
Also, is it measured over a specified time interval? because wouldn't any cylinder leak down 100% given enough time.
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04-11-2006 09:14 AM #2
Burnt exaust valve or valves,I ran a 300 straight 6 for years with the burnt exaust valve.A vaccume guage will tell the story.Its gunna take longer than u thought and its gunna cost more too(plan ahead!)
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04-11-2006 09:20 AM #3
but I don't know what the vacuum should be without burnt valves.
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04-11-2006 09:41 AM #4
if you don't have a burnt valve the gauge needle will stay study, if you have a burnt valve the needle will flicker real fast.Mike
check my home page out!!!
http://hometown.aol.com/kanhandco2/index.html
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04-11-2006 09:48 AM #5
but wouldn't that only tell me if the burnt valve is on the intake?
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04-11-2006 10:25 AM #6
Originally Posted by tcodiMike
check my home page out!!!
http://hometown.aol.com/kanhandco2/index.html
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04-11-2006 02:12 PM #7
Mike thanks for that drawing. I'm sure it will help sometime down the line.Keep smiling, it only hurts when you think it does!
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04-11-2006 02:47 PM #8
a vac. gauge can tell you a lot. i all ways run a vac. gauge in the dash of the race cars i built.Mike
check my home page out!!!
http://hometown.aol.com/kanhandco2/index.html
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04-12-2006 05:04 AM #9
yeah I wish I had one inside my car, I couldn't get a vacuum gauge in the style of the rest of my gauges though.
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04-14-2006 05:09 AM #10
ok, used a leak down tester last night and every cylinder came out around 20%, +/- 5 or so. On each one I could detect a sound if I put my ear to the exhaust pipe, it was faint as hell so I don't know if it was something else I was hearing.
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04-14-2006 07:10 AM #11
Originally Posted by tcodiMike
check my home page out!!!
http://hometown.aol.com/kanhandco2/index.html
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04-14-2006 08:31 AM #12
no, I haven't run it yet with a vacuum gauge cause I don't have one, but I'm going to get one. Some things are still a little sketchy, like if I'm on the throttle real hard and then have to shift I sometimes get a pop out the exhaust. After taking all the plugs out last night I see that they are looking lean, which I don't understand because when I was warming it up before doing the test it was burning my eyes.
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04-14-2006 03:32 PM #13
you can have a rich idle and a lean WOT. 2 dif. parts of the carb. what kind of carb. do you have?
"but wouldn't that only tell me if the burnt valve is on the intake?"
this is a ? you had before and no one answered it. this would tell you the burnt valve was on the exhaust, not the intake. if the intake valve was leaking then you would hear comp. blowing back up through the carb.Mike
check my home page out!!!
http://hometown.aol.com/kanhandco2/index.html
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04-14-2006 11:49 PM #14
Originally Posted by lt1s10just because your car is faster, doesn't mean i cant outdrive you... give me a curvy mountain road and i'll beat you any day
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04-15-2006 06:37 AM #15
Originally Posted by thesalsMike
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