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Old 11-26-2021, 09:37 AM   #11
mschafer
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Thumbs up Re: Leakdown Testers

I have a OTC also ,works well and would recommend it.
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Old 11-28-2021, 05:12 PM   #12
Dave Bergfeldt
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Default Re: Leakdown Testers

Do Not .... I repeat Do Not get the Harbor Freight unit ... Difficult to use ... inaccurate numbers!!!!
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Old 11-29-2021, 08:13 AM   #13
sst5167
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Default Re: Leakdown Testers

I bought mine off a Cornwell truck quite a few years ago. I use mine after every race on both car as part of my routine maintenance, and it's been perfect. I would buy another one if I needed too.
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Old 12-12-2021, 03:27 PM   #14
reknapp52
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Default Re: Leakdown Testers

Turns out my brother has a Matco tester that I will be using. Do I need to warm the motor before running the test? It's been parked in my garage for about 3 weeks without being started. Also, what numbers are acceptable? My motor is 447 C.I. with 14.3 compression.
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Old 12-13-2021, 06:43 AM   #15
SGSST109E
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Default Re: Leakdown Testers

You can leak a motor cold or hot. Just do the same thing each time. A warm motor should leak alittle better the cold. If doing cold just spin the motor over a few revolution to make sure you have some oil on the walls. Certainly under 10% mine usually leak 3 to 5% when fresh cold
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Old 12-14-2021, 01:01 PM   #16
sst7250
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Default Re: Leakdown Testers

Had an OTC for years with no issues
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Old 12-18-2021, 01:24 PM   #17
Mike Pearson
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Default Re: Leakdown Testers

Quote:
Originally Posted by reknapp52 View Post
Turns out my brother has a Matco tester that I will be using. Do I need to warm the motor before running the test? It's been parked in my garage for about 3 weeks without being started. Also, what numbers are acceptable? My motor is 447 C.I. with 14.3 compression.
Depends a lot on the ring type and end gap. Also piston to wall clearance will effect the readings. 10 or better is what you are looking for. You don’t want any blow by on the intake valve. That is a killer. Also equal across all cylinders is another good sign. Leak down is a tool not a tell all.
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