Ok guys I got this engine in my house that is suppose to be rebuilt. My question is, can I test it? I know its been pulled apart from the paint job. I found out from that a compression cant be checked unless its installed. It was done at B&B in Sacramento California, but I here he gets a lot of parts used. I was told by a guy that he might not actually resurface the housing like he says he does. Anyways any help on testing this engine would be great because I can still give it back. Also it was sitting around for a while ourside the car.

I paid 1.4k for the engine and the shell which is very clean.


Thanks and God Bless,
Zach

 

Just listen. Turn the engine by hand and listen for 6 equal puffs . If one or more is quieter than the others, the engine has low compression.

 

you could slap the tranny on so you could jump the starter. I did it before.

 

I have a 'rebuilt' s5 t2 engine that I also need to test. I'm glad this thread came up.

 

another thing u can do is look in the exhaust port see if u see apex seals, if they arnt there then you know it blew up.

 

ive done that, just add like 5 psi to the numbers you get beacause itz cold...

 

That's cool, I'm DJgeque's friend. His mechanic said you can't get a good indication of the compression unless the engine is at operating temperatures. My dad said to put the engine into an oven, then test it.

He was kidding.

fw88, where did u get the idea to add 5 psi? I'm just wondering if it something you came up with or something you read before.
I also like the idea of listening to equal huffs and huffs. We're pretty sure the apex seals are there atleast..

 

i have herd, the diffrence between warm and cold compression is approx 5 pounds so, if the engine is just hooked to a starter and hasent been ran in a long time, 5 psi is cloase to the actuall real number, also 3 strong chungs from each rotor housing will deterimine it hasent eaten any apex seals...

peace

Dustin

 

You can cold-test a rotary for compression and the results will be fairly accurate...you take away about 5psi from the cold test results. Because a rotary loses about 5psi compression when warm, as compared to when cold. IN my experience.

Bolt a trans and starter up and use a battery to crank it over. Be sure the throttle is open (if a manifold is installed) and remove a plug from the front and the rear.

www.rotaryresurrection.com ---> tech ---> compression test

 

i take that back, i got them mixed up kevin is rite.... sorry for the miss info

 

Best idea when the engine is out of the engine. I wonder how much it would jump around if you just tried turning it over on the floor, maybe leave it in the hoist?

 

when i did it, the engine was sitting on a pallet and t dident seem to move much at all

 

if you left it on the hoist it would shake more because it is in the air.