#Rotary engine compression tester manual#

Good to know yours have improved noticeably. I was thinking of getting another compression test at the same specialist in a month or two to see what difference it has made. I have now double changed the oil to 10w40 Millers Trident and have completed ~1000 miles already. Initial compression test showed 6.5 to 7.1.

Got the RX8 about a month ago, owned by an older person for last 15 years and the car saw very little use in last 10 years. Very good point and I am actually in the same situation as you. Don’t worry about compression too much if it runs well. I tested the car last Saturday out of curiosity at Rotor Torque, and the car showed 7.1, 7.5, 7.2 and 7.6, 7.3, 7.4. I’ve put 1,000 miles on it since I took over ownership and have been redlining it 5-10 times per drive. It’s previous two owners were 65+ years old. My recently purchased RX-8 showed 6.7-7.0 compression results on all 3 faces front and rear. basically fix it early (rotor housings and walls are not cheap!!!) Its quite possible to have 1 rotor knackered and the other fine - in some cases the healthy rotor will 'carry' the other until it too fails or the dying rotor simply will not fire at all, if in this case you have unknowingly become accustomed to the 'change' the only way of finding how your engine is is to either test drive another car and compare or have a compression test!Īlso i should add that in most cases if your engine is already on route to failing and the cause cannot be rectified without a re-build - re-building the engine asap is recommended as 'whipping' a dead rotary will cause excessive wear within the rotor housings and side walls and these in turn would then need replacing. Readings outside of those levels, i.e., lower compression readings or greater difference in readings between rotor faces or between rotors, indicate a 'less-than-healthy engine' that probably requires rebuilding. Standard difference in chambers should be within 21.8 PSI (1.5), and difference between rotors within 14.5 PSI (1 (kgf/cm2).

#Rotary engine compression tester manual#

The workshop manual for the RX-8 states the “standard” compression as 120 PSI (8.5) at 250 RPM, and the minimum as 98.6 (6.9) PSI at 250 RPM. Not the one I originally found from Mazda but does give you the details. The unit will give accurate, reliable and repeatable compression readings in all engines from the factory standard to the all out.