Rgobert52

I am a newby with rotory engines. Is there an alternate way to check the 13B engine compresion other than using the recomenced Mazda compresion tester?

n4ji

iTrader: (1)

Take out the spark plugs and crank the engine. You should hear three even "blups" If compression is high. It's not a very reliable way of checking it, but it'll tell you if you threw an apex seal or something along the lines of that.

Aesop Rock

you can use a normal compression gauge, if you remove the check valve, remove the trailing spark plugs, and put it in there.....you should on an N/A get thre bounces to 90, 85.....or at the least 80......after that your getting very low....

Icemark

90 is pretty low too, and should be considered ready to rebuild.

Don't forget when testing compression on a rotary engine you must test at WOT or you won't get a good reading.

DylanShupe

Where is the best place to have one rebuilt?

Icemark

I recommend Kevin at Rotary Resurrection

yagotrice

I tested my compression on my 88 and the front was at 120psi and the rears was at 90psi. What are they sapose to be at?

Icemark

they should all be above 90 psi, ideally 120-130 psi range is great.

RotaryResurrection

iTrader: (8)

http://www.rotaryresurrection.com/ro...lder/comp.html

KingCobraV9

iTrader: (2)

can you check the compression if you dont have a battery. like by cranking it by hand? i think i read that you could somewhere

YearsOfDecay

you can hear the fweeps without a battery by turning the motor by the front bolt..... but thats a REALLY poor way to do it, but if a seal is gone... you will notice a difference.

denver

first disconnect your ignition, and later plug the compresion tester into the slot.

And try to start your motor, the compresion tester say your psi.

But if you try to do this with the ignition connected then your psi is no real.

RotaryResurrection

iTrader: (8)

Uh...hello? original post date? duh.