John Senini

so what's the deal with those special compression testers? I have done the standard remove the valve and look for a bump-bump-bump what am I missing?

Kim

It measures each of the three sides of the rotor.
Reads it out digitally and is ******* expensive.

Black91n/a

Don't you mean remove the spark plug? These engines have no valves. The mazda tester will give you a seperate compression number on each rotor face. I'd think that an analogue guage would be good for a quick check (as long as it doesn't hold the peak #), and will let you see if there's a broken seal, but won't be that good for determining the actual compression numbers. I wouldn't advise buying a rotory tester, just take the car to a shop that has one and have them do it.

misterstyx69

iTrader: (142)

He means the schrader valve on the normal engine compression gauge..You know ..the little pin thingie on the side of the Gauge to reset it ..and Kevin landers has a Write up on his site explaining a quick How-To for Compression.. www.rotaryresurrection.com (pluggin ya again ...Kevin Landers ..the NEW Chuck Norris!..J/K..Kevin!!)