3rd Generation Specific (1993-2002) 1993-2002 Discussion including performance modifications and Technical Support Sections.

Compression gauge

Old 02-10-08, 02:51 PM
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Compression gauge

I'm thinking about checking the compression of my rotors. . .I've never had them checked and I'm curious. . .even though the car seems to be running great right now.

I would like to do it myself, as I see it's not too difficult.

Any recommendations of a particular guage to buy?

Also, any other words of advice?

By the way, I have guages on my A/C charging manifold. . .could I just buy an adaptor and use the high pressure guage?
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Old 02-10-08, 02:53 PM
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Old 02-10-08, 03:02 PM
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Thanks for the quick reply mo. . .so pretty much any piston compression guage will work, huh? They're not too expensive, I found a mityvac kit on ebay for $50, and some cheapos for around $20. I'll probably get a nice set to keep in the garage.
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Old 02-10-08, 03:51 PM
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Originally Posted by rx slim View Post
I'm thinking about checking the compression of my rotors. . .I've never had them checked and I'm curious. . .even though the car seems to be running great right now.

I would like to do it myself, as I see it's not too difficult.

Any recommendations of a particular guage to buy?
Check these out: http://RotaryDiagnostics.com
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Old 02-10-08, 04:15 PM
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Those are pretty awesome, and seem pretty reasonably priced for such a nice unit. . .just a little more than what I need right now.
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Old 02-10-08, 10:56 PM
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You can make the same thing for about $200 is you know basic electronics.

DATAQ for the controll box and software for about $25.

0-250 psi, 0-5VDC pressure transducer for about $120.

It requires a 10-30VDC power supply and my battery drops below 8 when cranking so I made a small battery for that.

A dapter for the transducer to spark plug hole with quick disconnect.
About $40.
Attached Thumbnails Compression gauge-compression-testerx.jpg  
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Old 02-11-08, 04:03 PM
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I've used a nearly identical setup as above for years. I've found the following transducer to be less than reliable though. http://www.ttiglobal.com/Product.asp...CategoryID=247 They had been available for about $120 but the price has since went up. Do not know why they failed but they would sit in the tool box for a few weeks then the next time I wanted to use it they were dead. I recently saw that FJO offers a similar transducer for their electronic pressure gauges. Best part is they can be had for about $75. Part number SHP0200 is a 0-200 psi sender. Same 0-5V linear output.

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Old 02-11-08, 04:41 PM
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I have seen some advertised cheap transducers that have a very low cyclic life.
Some may not be able to handle oil.

I use Measurement Specialties, INC (MSI) transducer.
Model MSP-300-250-P-4-N-1.
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Old 02-16-08, 09:11 AM
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Originally Posted by cewrx7r1 View Post
You can make the same thing for about $200 is you know basic electronics. DATAQ for the controll box and software for about $25.

0-250 psi, 0-5VDC pressure transducer for about $120. It requires a 10-30VDC power supply and my battery drops below 8 when cranking so I made a small battery for that.

Adapter for the transducer to spark plug hole with quick disconnect.
About $40.
All true, but for those who want a ready-to-go quality system that includes detailed instructions on how to configure the software and extract/analyse the data, it is well worth the extra money. IMHO, of course.
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Old 02-16-08, 10:49 AM
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could the datalogit be used to log the 0-5V signal from one of these? can it log while the engine cranks?
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Old 02-16-08, 06:01 PM
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Really, I just use a plain old piston compression tester with the schrader valve removed. Mostly you just want to see if there are 3 even pulses on each rotor. General motor strength I normally just look at the vacuum it's pulling - 15 and up, it's fine, below 15" and it's a bit on the weak side.

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