Compression test results..you tell me

[xexitenglishx]

I did a compression test today and these are my rough results.
1 - 145
2 - 140
3 - 145
4 - 145
5 - 155
6 - 155
7 - 155
8 - 160

I did a cylinder balance test and it came out code 99 which means all is good.
I havent bought a leakdown tester yet. When i tested the drivers side compression the psi on the gauge held close to the number that it was jumping to..when the passanger side was tested the needle sweeped the whole gauge every time. I looked like it didnt hold the compression aswell. I dont know if it was just me or if that is something to be concerned with. The reason i am doing these tests is because im planning on turboing my car and i wanted to know it these results are good enough? Any advice would be great

Thank you

 

[Dean85GT]

compression looks good...all numbers are within 15% Happy modding.

 

[HISSIN50]

One can have decent compression test results but bad leakdown results (important for forced induction). The numbers look fine here but I like your idea to do the leakdown first.

Good luck - sounds like a cool project.

 

[xexitenglishx]

thanks i gotta look into that. How long does it toke to do one of them? it seems teadious to have to bring each cylinder to tdc. How much would a shop charge for it? Thanks

 

[Foxfan88]

whats a leakdown test??

 

[xexitenglishx]

You ened a special device adn a compressor. You use it to test the amount of pressure that is leaking pass the cylinder walls. Thus if alot of pressure liek a supercharger or turbo is added there will be either consuption of oil or other problems when you dont have a tight piston seal. Or well atleast tahts what i get out of my research.

 

[HISSIN50]

Yep. The leakdown test helps isolate where compression is being lost. IIRC Tom Moss has a write-up on making a tester on his site (or he wrote an article on S+2B's site).

Good luck.