Compression test
I HATE SPEEDBUMPS!
Joined: Nov 2007
Posts: 8,549
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From: Las Vegas, NV
Compression can be checked two ways: manually with a compression gauge, or electronically with an engine analyzer that measures cranking compression. With electronic testing, a computer analyzer estimates compression in each of the engine's cylinders by measuring slight variations in engine cranking speed.
I never did it before in my life, i hope this helps a bit...
I never did it before in my life, i hope this helps a bit...
Last edited by monchie; Mar 1, 2011 at 12:08 AM.
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Joined: Nov 2008
Posts: 603
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From: Long Beach, CA
Compression can be checked two ways: manually with a compression gauge, or electronically with an engine analyzer that measures cranking compression. With electronic testing, a computer analyzer estimates compression in each of the engine's cylinders by measuring slight variations in engine cranking speed.
I never did it before in my life, i hope this helps a bit...
I never did it before in my life, i hope this helps a bit...
Last edited by PeteInLongBeach; Mar 2, 2011 at 05:03 AM.
#50
Joined: Nov 2007
Posts: 7,521
Likes: 11
From: Caput Mundi
There's no accurate way to measure the compression with a standard mechanical gauge.
Especially "static" compression is rpm related, that's why Mazda has a graph to correct for the right rpm range.
Without a chance to analyze the 3 different rotor faces all you're getting is a rough estimate of the rotor's average at an unknown speed.
That's not enough to get an accurate idea!
If you have a good tool however you can come to a little more accurate results by keeping the pressure relief valve open.Just look at the gauge's spikes in a determined time lapse.
Each 3 spikes = 1 revolution, right? count the spikes in 10secs, multiply by 6 and you have a rough cranking rpms estimate.
Still a very rough estimate though and not enough for a warranty claim, is that's what you're after.
Especially "static" compression is rpm related, that's why Mazda has a graph to correct for the right rpm range.
Without a chance to analyze the 3 different rotor faces all you're getting is a rough estimate of the rotor's average at an unknown speed.
That's not enough to get an accurate idea!
If you have a good tool however you can come to a little more accurate results by keeping the pressure relief valve open.Just look at the gauge's spikes in a determined time lapse.
Each 3 spikes = 1 revolution, right? count the spikes in 10secs, multiply by 6 and you have a rough cranking rpms estimate.
Still a very rough estimate though and not enough for a warranty claim, is that's what you're after.
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Joined: Jul 2009
Posts: 227
Likes: 10
From: Utrecht, Netherlands
Registered
Joined: Jul 2009
Posts: 227
Likes: 10
From: Utrecht, Netherlands
The German guy needed it on a short term in the weekend........it worked for him and he did fix the job with it.......yeahhhhhhh......."Deutsche Wertarbeit" !!!
that's some dedicated rotor head I gotta say !
Im a rotor head too but I rather just get the official tool ... and I already got it in fact.
need to find a way to go get it tho cuz its not in NYC.
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