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The Terminator
Engine/Tuning
Compression fine, leak down high?
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<blockquote data-quote="LSwat" data-source="post: 16438845" data-attributes="member: 90532"><p>Took the car to a performance shop to get a general checkup on it. </p><p></p><p>Build is as follows.....</p><p>- Bored and stroked (about 10k on the build)</p><p>- heads / rest of the motor have about 85k on it and are stock to my knowledge</p><p></p><p>Compression test came back at 165 - 170 on all 8 cylinders (So this is good)</p><p></p><p>Leak down test had a bit of a range on it. 4 & 6 were highest & right on 20% , then there was a bit of range from there on the other 6 cylinders.</p><p></p><p></p><p>Ultimately, I know compression tests are subject to "false findings" , oil in the cylinder can cause better "compression" and falsify this.</p><p></p><p>However I am not sure what I should take away from the leak down results. I am ASSuming the leak down was done correctly with all cylinders at TDC but lets say for argument sake it was done correctly.....what would cause the 20% on leak down ? Just heads with 85K miles on them? Or should I be looking at something else?</p><p></p><p>Would you guys typically investigate 20% leak down on a motor?</p></blockquote><p></p>
[QUOTE="LSwat, post: 16438845, member: 90532"] Took the car to a performance shop to get a general checkup on it. Build is as follows..... - Bored and stroked (about 10k on the build) - heads / rest of the motor have about 85k on it and are stock to my knowledge Compression test came back at 165 - 170 on all 8 cylinders (So this is good) Leak down test had a bit of a range on it. 4 & 6 were highest & right on 20% , then there was a bit of range from there on the other 6 cylinders. Ultimately, I know compression tests are subject to "false findings" , oil in the cylinder can cause better "compression" and falsify this. However I am not sure what I should take away from the leak down results. I am ASSuming the leak down was done correctly with all cylinders at TDC but lets say for argument sake it was done correctly.....what would cause the 20% on leak down ? Just heads with 85K miles on them? Or should I be looking at something else? Would you guys typically investigate 20% leak down on a motor? [/QUOTE]
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Compression fine, leak down high?
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