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thanks...

 

Autzone...

 

you mean autozone.com ?

rotary comp tester is a bit special tool, as you know... that web shop definetly could not have it.
we will need to know all three chambers comp. ratio while measuring each spark plug.

the only one that i found so far is that mazdatrix sells for $850
http://www.mazdatrix.com/toolmisc.htm

but are there any cheaper solutions available on the market?

 

None available. You can make you own for about $200. All you need is a pressure transducer and a datalogger.

 

The cheapest? It's easy but not as completely accurate as a digital gauge.

This would entail getting a cheap compression tester and removing the schrader valve from the end of it. The schrader keeps the pressure in the gauge, showing only the highest reading. Removing it allows each face of the rotor to show how much compression it's achieving by itself. Spin the engine and watch for the pulses. A good reading will be over 85 psi each pulse. If it's one good pulse followed by two low readings, it's an apex seal. If it's 2 good pulses followed by a single low, then you've got a burned side seal.

On my engine, after rebuilding it, the readings showed 100 psi on all three sides, both rotors.

 

Can't you just use a regular Autozone one? Hold the Schrader valve in to read faces and let it go to get total?

 

$10 compressor tester from Harbor Freight. just remove the schrader valve and you're good to go.

http://www.harborfreight.com/cpi/cta...emnumber=92697 $4.99 special.

 

^ basically same style I use. Just look for 3 even bounces of the needle.

 

Get a regular compression tester that doesn't hold the reading then video tape it while it's testing. That's cheap and easy datalogging right there. Just be sure to set the camera for a fast frame rate if possible.