slidinrx72010

So I have a motor out and on the ground that a customer gave me to put in his car, and he says its good... However, I would like some sort of way of checking before I just go put it in. I do NOT have the mazda compression test tool, so I will need another idea other than that.

st1llet0

iTrader: (2)

Bolt up a bellhousing and starter, use a standard piston compression testor, just hold down the air bleed and check for consistent pulses, should be very close on both housings.

RotaryRocket88

iTrader: (7)

^ Yep. Prop the throttle plates open and add a small amount of oil into the combustion chambers through the exhaust ports / spark plug holes. If it's bone dry inside, compression numbers will come out low. Just don't add a ton. If you add too much, it will produce artificially high numbers, and hide potential problems.

89fc3sgtu

iTrader: (3)

to spin the engine jump the the starter with a car battery, and use piston ccompression guage as said before

AUGieDogie

iTrader: (4)

so does this method work with the electronic testers that mazda used to use? I know there was a nice one that printed everything out, and, I think, one that just showed the numbers on LED

jjcobm

iTrader: (18)

Yes, the tester will just read the compression numbers as long as the engine is turning....

AUGieDogie

iTrader: (4)

kinda what i thought.
I't to bad those things arn't cheaper. It would be great to know what all the numbers are instead of just watching it go bump. bump, bump