Numbers from leakdown test

exgmguy · 10-04-2001, 03:06 PM

OK, I used my same leakdown tester on 4 different engines. Including a brand new Chevy Truck with a V-8. The numbers were all relatively the same. About 20-30 percent.

Now, my tester has 2 gauges on it. The first gauge is a 0-100 gauge that reads inlet pressure, and the second is the one you set at 0 to test. The 0-100 gauge reads about 35 psi, while the air compresser reads 125 psi. This was checked on 2 different air compressors. I tried a different tester that has only one gauge on it and the numbers were different.
All of the cylinders came up with 10-14 percent leakage. The test was again done cold.

I asked an engine builder about my numbers and he said they are probably fine. His 10 second Camaro is at 14 percent and runs exactly the same as it did with it's fresh 5 percent leakdown.

So after removing my intake I found my intake gaskets were leaking and pulling in oil from the lifter valley into the ports. I also removed all my valvesprings and the guides came up good.

At the track I ran 11.50 @ 120 mph with 3 melted spark plugs. Luckily all of the cylinders seem to be in decent shape.

Does this make any sense?????

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10-04-2001, 03:06 PM	#8
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	OK, I used my same leakdown tester on 4 different engines. Including a brand new Chevy Truck with a V-8. The numbers were all relatively the same. About 20-30 percent. Now, my tester has 2 gauges on it. The first gauge is a 0-100 gauge that reads inlet pressure, and the second is the one you set at 0 to test. The 0-100 gauge reads about 35 psi, while the air compresser reads 125 psi. This was checked on 2 different air compressors. I tried a different tester that has only one gauge on it and the numbers were different. All of the cylinders came up with 10-14 percent leakage. The test was again done cold. I asked an engine builder about my numbers and he said they are probably fine. His 10 second Camaro is at 14 percent and runs exactly the same as it did with it's fresh 5 percent leakdown. So after removing my intake I found my intake gaskets were leaking and pulling in oil from the lifter valley into the ports. I also removed all my valvesprings and the guides came up good. At the track I ran 11.50 @ 120 mph with 3 melted spark plugs. Luckily all of the cylinders seem to be in decent shape. Does this make any sense?????