Compression Test on JDM 4G63

[smokey90gsx]

I was wondering if there is anyone with a JDM 4G63 who has tested their compression. I am curious to know if the compression on the JDMs are higher than the average 160psi that the 1Gs get. Also, what does a compression tester read for the 2Gs? Thanks.

 

[Aikouka]

My JDM motor was tested by the importer and they found 150, 155, 150, 155 for the cylinders.

 

[smokey90gsx]

Ok, and what do the 2Gs get? thanx

edit: nevermind, I found it here: http://www.dsmtuners.com/forums/showthread.php?t=126164

 

[smokey90gsx]

My JDM motor was tested by the importer and they found 150, 155, 150, 155 for the cylinders.

I wonder if this was done with the motor being at operating temperature... those compression numbers seem kinda low...

 

[Aikouka]

I wonder if this was done with the motor being at operating temperature... those compression numbers seem kinda low...

It was an on-the-bench test so that could be the reason why. I got the motor from Rising Sun Engines ( www.risingsunengines.com ) and they talk about their testing methods on the site.

This is what it says:

Some engine suppliers feel that "crank testing" or "leak-down testing" an engine is adequate. It may be for them, but it shouldn't be good enough for you! Dynamic testing, that is, actually starting and running the engine on a test bench, is by far the best way to test an engine. Be assured that your used engine, or even your rebuilt engine will be hot-run tested, compression tested, and oil pressure tested. Your engine is test run on natural gas rather than gasoline to make doubly sure that it burns clean. Dynamic testing like this also allows us to make sure that your engine runs quietly. After your engine is cleaned in our environmentally friendly "closed loop" system and tested, it's bagged and crated for shipment. If this sounds like a lot of work, it is! It takes an average of 3 hours to prepare and properly test each engine. Why go through so much trouble? We look at it like this: Every used or rebuilt engine gets thoroughly tested one way or another. Either your engine supplier can do it for you, or you can pay your mechanic to test it by installing it in your vehicle! Which would you prefer?

 

[Defiant]

Natural gas?

That seems odd.

 

[98RedGs]

http://www.dsmgrrrl.com/FAQs/compression.htm
Compression stuff.