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compression test results

Old 08-Nov-2009, 08:17 PM
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compression test results

just wondering what I should be expecting on my compression test on my b16a

#1 155
#2 120
#3 150
#4 160

so I noticed #2 was a little bit lower..
I did the test with all spark plugs out..and 5 cranks with the dizzy unplugged..
so just wondering causes for this...mostly piston rings? and headgausket? valves? any tests I can do to narrow it down?
thanks Chris
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Old 08-Feb-2010, 11:32 AM
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did u make sure to unplug the fuel pump fuse? or what about holding the throttle wide open while cranking? is the battery charged?

also, u gotta have da car up to operating temps, after u get your initial numbers, squirt some oil into the combustion chamber and repeat the test, depending on your results you can then do a leak down test

B16a compression pressure = 164.7 psi
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Old 08-Feb-2010, 11:38 AM
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you don't need to unplug the fuel pump fuse, unplugging the dizzy will make the injectors not fire.

Those numbers are pretty low all around. I mean most b16s I've ever compression tested run around 180-210psi.

Cylinder #2 is 30% lower than your highest cylinder (#4).

Could be piston rings or the valves.

Like mentioned above, a leakdown test can help narrow down the problem.
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Old 11-Feb-2010, 07:42 PM
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The numbers are pretty low.
I would have the compression test done again, and I would have a leakdown test performed. Hope everything works out.
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