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The Terminator
Engine/Tuning
compression test results
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<blockquote data-quote="TrickStang37" data-source="post: 4971690" data-attributes="member: 48429"><p>basically in a leak down test they use a compressor to put air in the combustion chamber through the spark plug hole at TDC. They regulate how much air goes in, and read how much air is actually staying in there. If there is a leak, they can hear the air coming out of either the intake manifold, exhaust or PCV valve. If they hear it from the intake, its the intake valve. If through the exhaust, an exhaust valve. And if through the PCV its the rings.</p><p></p><p>If they did a compression check, they basically turn the motor over, usually about 3 times, and read how much compression the cylinder is making one cylinder at a time. But with a compression check, you can't tell what the problem is specifically, not usually, but only know that you do have one. Have them do a compression check, if the compression is close enough relative to each other, you should be fine.</p><p></p><p>either way, 11% is not that bad.</p></blockquote><p></p>
[QUOTE="TrickStang37, post: 4971690, member: 48429"] basically in a leak down test they use a compressor to put air in the combustion chamber through the spark plug hole at TDC. They regulate how much air goes in, and read how much air is actually staying in there. If there is a leak, they can hear the air coming out of either the intake manifold, exhaust or PCV valve. If they hear it from the intake, its the intake valve. If through the exhaust, an exhaust valve. And if through the PCV its the rings. If they did a compression check, they basically turn the motor over, usually about 3 times, and read how much compression the cylinder is making one cylinder at a time. But with a compression check, you can't tell what the problem is specifically, not usually, but only know that you do have one. Have them do a compression check, if the compression is close enough relative to each other, you should be fine. either way, 11% is not that bad. [/QUOTE]
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