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Compression Test Results..

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davidr Casual Dubber

26 posts · joined Oct 2011 ·

#972593
G'day all,

I did a compression test on my motor (71 superbug) yesterday and came up with the following.

#1 105
#2 115
#3 118
#4 130

Did the test on warm motor. Hope someone may like to give an analysis of the results.
Anything I need to be concerned about.?

Cheers,

Dave.

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 ·

#972629
There are tests and there are tests

Was it a screw in tester or push in?

Whatever - 115 to say 125 is the mark for a healthy 1600

#4 seems really healthy and #1 ....well, is a bit low, but nothing to worry too much about.
"ideally" they should be within 5lbs of each other......... but .................

Have a read here
http://www.vw-resource.com/vw-resource.com_non_ssl/search.php?zoom_query=compression+test&zoom_per_page=10&zoom_and=1&zoom_sort=0

If it is driving fine i wouldnt worry, just keep an eye on things
Futue te ipsum!!!

davidr Casual Dubber

26 posts · joined Oct 2011 ·

#972633
Thanks mate,

Screw in tester.

There was probably 10-15 mins by the time I got from #1 to #4. Could that be a factor.?

Cheers.

vduboy Insano Dub Head

702 posts · joined Oct 2012 ·

#972675
Did you do the test with a wide open throttle as well? As doing it with the throttle closed can affect the reading.
It will all be OK in the end, if it's not OK it's not the end!

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 ·

#973136
you need to check you tappet gaps and then retest cos no1 is quite low compared to the others. generally you want them to be within 10% of each other. More than this and altho engine will run it won't be as smooth as it should be.

If no1 doesn't come up after tappets then means either worn valves or piston rings. Fine for now but one of them is getting near rejuvenation time.
madness is in the eye of the beholder 👍

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 ·

#973142
Also do the test with ALL spark plugs removed to allow the motor to spin quickly.👍