How is a compression/leakdown test performed
10-08-2004, 09:12 PM
#2
Nordschleife Master
Joe,
Maybe $10 to $20 for the tester.
Among other threads...
https://rennlist.com/forums/showthre...mpression+test
A good time to splurge for new plugs and swap them in.
Maybe $10 to $20 for the tester.
Among other threads...
https://rennlist.com/forums/showthre...mpression+test
A good time to splurge for new plugs and swap them in.
10-09-2004, 10:33 AM
#4
Nordschleife Master
Here's one:
http://www.harborfreight.com/cpi/cta...emnumber=39224
I should say that a real leak down tester is a lot more. $80 and up, if I recall it correctly. Needs an air compressor, too. I made one from a couple of fittings and just listened to the noise. With the leak down test, a calibrated ear can determine if it's rings or valves that are leaking.
http://www.harborfreight.com/cpi/cta...emnumber=39224
I should say that a real leak down tester is a lot more. $80 and up, if I recall it correctly. Needs an air compressor, too. I made one from a couple of fittings and just listened to the noise. With the leak down test, a calibrated ear can determine if it's rings or valves that are leaking.
10-09-2004, 03:56 PM
#5
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Hey Joe, Ive got a leak down tester you can borrow. Ill bring it to sharkoberfest if you like, just ship it back. I actaully have 2 of them. One i ordered from summit then one i bought locally. I forgot to cancel the Summit one on back order. Thus 2.
Its a really easy job to do.
Tips off the top of my head.
remove the plug boots and blow air down them to get rid of any debris.
Pre loosen all the plugs then tighten them back up again and go for a drive or get the car warmed up. An accurate leakdown really can only be had when the car is warm from what i gather.
Once you get back, pull all the plugs, theywill be hot, but youve already cleaned the holes out and made sure they come out easy.
I used the firing order as a quide. I found TDC on the #1 piston then did the test according to the firing order as you know which one is coming up next. Helps keep things straight.
It will help to have another person hold the crankshaft bolt and the wrench holding it, as the car is warm, the air forced into the cylinders during the test will cause the engine to turn over.
Simple really and IMHO way more accurate , than a compression check.
Its a really easy job to do.
Tips off the top of my head.
remove the plug boots and blow air down them to get rid of any debris.
Pre loosen all the plugs then tighten them back up again and go for a drive or get the car warmed up. An accurate leakdown really can only be had when the car is warm from what i gather.
Once you get back, pull all the plugs, theywill be hot, but youve already cleaned the holes out and made sure they come out easy.
I used the firing order as a quide. I found TDC on the #1 piston then did the test according to the firing order as you know which one is coming up next. Helps keep things straight.
It will help to have another person hold the crankshaft bolt and the wrench holding it, as the car is warm, the air forced into the cylinders during the test will cause the engine to turn over.
Simple really and IMHO way more accurate , than a compression check.
Last edited by Tony; 10-09-2004 at 04:18 PM.
10-09-2004, 04:26 PM
#6
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THanks Tony, I'd be much obliged if you did bring it. I want to check it before I NOS the beast.
i'm in the middle of changing the suspension. Taking a little break. It's so easy it's scary.
i'm in the middle of changing the suspension. Taking a little break. It's so easy it's scary.