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Old 06-01-2015, 11:15 PM   #1
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Video- How to Leakdown Test a cycl head

Short informational vid on how to leakdown test and it's usefulness. Great indicator of engine health cylinder by cylinder.

SVT timing belt install next.

https://www.youtube.com/watch?v=8NZV52Dq8I4


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Old 06-02-2015, 12:06 AM   #2
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Old 06-02-2015, 04:14 AM   #3
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Not really relateable in the real world, what numbers are looked at as good there are way above what you find on most engines, even ones that run pretty good.

Used more for drag racing where the last 5% loss can kill you. You can lose 5% in 30 seconds of running on a street engine at first startup. Many engines can be hard to get above 95% on even once and before running the engine at all.

Even a 'bad' 15% leak is pretty good on a street motor with some moderate mileage on it.

Why I leakdown on race engines but compression test on street engines.
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Old 06-03-2015, 11:47 AM   #4
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Decent short video on leak down testing, it's generally used for diagnostics of a problem found with the "screening" of a simpler compression test.

Great to do before tearing into an engine with an apparent issue, can't get that info. once it's torn apart & occasionally it'll reveal an issue that might be fixed without a tear down.
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Old 06-08-2015, 10:39 PM   #5
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This is such a great post, thanks for sharing, NJSVTGUY or Tom?. ...... I'm a newbie and this is so helpful.
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Old 06-23-2015, 09:32 PM   #6
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Cleaned this up, let's keep it on topic please?
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Old 07-31-2015, 04:51 PM   #7
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Part 2
Took head to machine shop. Looked great when I picked it up but failed on cyc #4 exhaust side.
1-3 held great. Going back on Monday, called and no issue at all..."bring it back".
Glad I checked.

This vid shows 80psi going in and the head only holding 60 psi. You can hear the air leaking. So not only can you troubleshoot with the leakdown tool, you can test with it.

https://www.youtube.com/watch?v=8GOrF5dpo_s

Last edited by NJSVTGUY; 08-03-2015 at 09:26 AM.
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