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Rb25Det Compression Test With Motor Out?

toy515

By toy515,
in Engines & Forced Induction

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toy515 Grand Master

toy515

Posted
Posted

Hey guys

I have a long motor rb25 no intake or turbo side and I'm wanting to do a compression test on it the motor is obviously out of the car

Just wondering what's the best way to get the best reading

Do I put oil down the cylinder?

Will readings be lower out of the car?

Any things I need to do different?

portaz Mentor

portaz

Posted
Posted

Ok I have done this a few times and it will give u a guide only, best way is leak down test but you can do a comp test turning by hand with all plugs out , u get tired easy and I find the first two jumps are what u should look at And I managed 100 psi by hand , just remember that on the starter ur turns at a few hundred rpm by hand it's like 4 and there really isn't any other way around it but like I said it gives u a guide. Once the engine is in I comp test before starting and so far it has worked out ok.

Scott

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