is a compression test really necessary ? - Page 2

onyx10 · 07-03-2008, 07:29 PM

What are compression numbers supposed to be? When cold or warm for each cylinder? How close should they be in relation to each other?

***solovus*** · 07-03-2008, 07:31 PM

Quote:

Originally Posted by onyx10

What are compression numbers supposed to be? When cold or warm for each cylinder? How close should they be in relation to each other?

I'm thinking between 130-150 based on what i've seen...the most important thing to look for is a cylinder with a large variance from the avg.

Gami004pilot · 07-05-2008, 05:28 AM

Quote:

Originally Posted by WolfPlayer

If you can change your spark plugs, you can do a compression test. Even *I* was surprised by how easy it is to do.

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I would like to do this but how? What do I look for? Is there instructions on how to do this on our STi's?

**elirentz** · 07-05-2008, 05:46 AM

^ search on here and nasioc and you will find.

Compression numbers should be in the 150-170 range from what I remember. YOu can find the numbers in said threads on nasioc though.

Gami004pilot · 07-05-2008, 06:33 AM

Okay another question

(gotta love the forums)!
Can anyone break down the purpose of a compression and what does it do and show? What are benefits of it and the disadvantages? Thanks.... (i think I want to do this)

mond12345 · 07-05-2008, 07:54 AM

I simple Internet search will answer your question very quickly.

stiboost21 · 07-05-2008, 08:03 AM

Quote:

Originally Posted by onyx10

What are compression numbers supposed to be? When cold or warm for each cylinder? How close should they be in relation to each other?

the numbers are suppose to be: 140,140,135,135. I am not sure if this goes in order for each cylinder, but those are the numbers I was told by a friend who works as a mechanic for SOA.

07-03-2008, 07:29 PM	#16
onyx10 Amateur STI Driver Car: '06 STI - OBP/Gold Fav Mod: Stg 2...for now! Location: Wisconsin Posts: 25 Join Date: Nov 2006 Trader Rating: (0)	Re: is a compression test really necessary ? What are compression numbers supposed to be? When cold or warm for each cylinder? How close should they be in relation to each other? This ad is not endorsed by this member. Please register or login to hide this ad.

07-05-2008, 05:46 AM	#19
elirentz Gold Member Car: 05 STi, 99 2.5rs Fav Mod: ohlins w/RCE springs, sz55 Location: charleston Posts: 478 Join Date: Nov 2005 Trader Rating: (1)	Re: is a compression test really necessary ? ^ search on here and nasioc and you will find. Compression numbers should be in the 150-170 range from what I remember. YOu can find the numbers in said threads on nasioc though.

07-05-2008, 06:33 AM	#20
Gami004pilot Senior STI Driver Car: 05 WRX STI Fav Mod: Just having an STI is good enough. Location: Central Florida Posts: 363 Join Date: Jul 2005 Trader Rating: (0)	Re: is a compression test really necessary ? Okay another question (gotta love the forums)! Can anyone break down the purpose of a compression and what does it do and show? What are benefits of it and the disadvantages? Thanks.... (i think I want to do this)

07-05-2008, 07:54 AM	#21
mond12345 Junior STI Driver Car: 2007 WR Blue STi Fav Mod: COBB! Location: PA Posts: 89 Join Date: Mar 2008 Trader Rating: (0)	Re: is a compression test really necessary ? I simple Internet search will answer your question very quickly.