|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
08-31-2015, 04:24 PM | #1 |
BANNED
Join Date: Feb 2013
Location: Coatesville, Pa
Posts: 719
|
Compression test vs Leak down test
I ran a compression test on my stock A and the range was from 62 to 65 pounds. Then I ran a leak down test and all the cylinders were different with one only registering 18 pounds with 40 applied. Can anyone explain why one test was OK while the other was poor. Thanks for any help.
|
08-31-2015, 04:56 PM | #2 |
Senior Member
Join Date: Jun 2014
Location: Land of Lincoln
Posts: 3,114
|
Re: Compression test vs Leak down test
Was the engine held at TDC on compression stroke for each cylinder ?
Where was it leaking from, intake,exhuast,crankcase |
Sponsored Links (Register now to hide all advertisements) |
|
08-31-2015, 05:55 PM | #3 | |
Senior Member
Join Date: May 2010
Location: Yakima Washington
Posts: 913
|
Re: Compression test vs Leak down test
Quote:
A compression test will tell you if you have a problem, A leakdown test will tell where the problem is. Bill |
|
08-31-2015, 06:00 PM | #4 | |
Senior Member
Join Date: May 2010
Location: Central, IL
Posts: 3,968
|
Re: Compression test vs Leak down test
Quote:
__________________
1929 Model AA - Need long splash aprons! |
|
08-31-2015, 06:29 PM | #5 |
BANNED
Join Date: Feb 2013
Location: Coatesville, Pa
Posts: 719
|
Re: Compression test vs Leak down test
I did have the cylinders on TDC but I only used 40 LBS. I could hear the leak coming from the intake. One cylinder held 30 LBS and the worst was only 18 LBS. I guess my intake valves are leaking some but the compression test seemed good.
|
08-31-2015, 06:39 PM | #6 |
Senior Member
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
|
Re: Compression test vs Leak down test
Sponsored Links (Register now to hide all advertisements)
40# on the leak test is fine. If you heard the leak on all cylinders from the intake I still don't think I'd worry about it. It does seem as though the engine rolled a bit when the air was applied. Just to be on the safe side I think I'd check the lash. |
08-31-2015, 08:26 PM | #7 |
BANNED
Join Date: Feb 2013
Location: Coatesville, Pa
Posts: 719
|
Re: Compression test vs Leak down test
I'll check the lash. Thanks for the help.
|
Thread Tools | |
Display Modes | |
|
|
Sponsored Links (Register now to hide all advertisements) |
|