Compression numbers
 

I did a compression test on the Galant today

Cylinder # 1 @ 109
Cylinder # 2 @ 110
Cylinder # 3 @ 145
Cylinder # 4 @ 130





Are these numbers good? :D

Re: Compression numbers
 

You should have posted this in the shoutbox. :D

Nice numbers!

Re: Compression numbers
 

Hmm, they seem a little low to me. And shouldn't they all be within 5% of eachother?

Re: Compression numbers
 

Let er buck.

Re: Compression numbers
 

best numbarz evarz

Re: Compression numbers
 

#3 and 4 need a bit of sand. Then you can turn the boost up some. :D

Re: Compression numbers
 

Haha I guess this went over my head for a minute there. Hell, I say turn the boost up now and see what happens

Re: Compression numbers
 

Will do!

That seems to be the DSMer motto. :lol:

It's already running 28psi on this pewpy E70. I wonder how 30+ would do :D

Re: Compression numbers
 

30+...is the flux capacitor in good working orders? lol, jk.

OP, I'm also going to do a compression test pretty soon. aren't good numbers like 150 across???? or between 120-130??? i remember seeing something like that on VFAQ...

Re: Compression numbers
 

150 is the JDM numbers and anything with compression in our USA DSM's is good just to clear that up. Lower compression means to turn up the boost.
For every 5 psi low turn boost up 1 psi.
Joe

Re: Compression numbers
 

every compression gauge reads different, as long at they are all in 5-10psi of each other you're usually good.

Re: Compression numbers
 

lol, this thread is awesome.

Anywho, looks similar to my old numbers. Unless you are trying to get every ounce of power of the motor, don't worry about it and go have fun.
Also you always need more boost.

Re: Compression numbers
 

moar boost!

http://i184.photobucket.com/albums/x...ppage/MOAR.jpg

Nah, leave it, rock it. When the HG was leaking on my evo a few weeks ago, my numbers were: 182 175 180 175 :)

Re: Compression numbers
 

more boost. It solves everything.

Re: Compression numbers
 

You could always hone and re-ring.....or you could just turn up the boost.

Lower compression = safe to boost moar!

Re: Compression numbers
 

By the book the best the compression could be is 165 psi 7.8:1 pistons, service limit is ~110psi or if cylinders are not with in x% of each other. As long as it runs good, makes good power, etc I would not worry about it.

~John

Re: Compression numbers
 

lower compression also mean's bad ring's possible bad hg or maybe something else. i would check for blow by. usually you should be at like 150-160

Re: Compression numbers
 

I need to emphasize that if you car runs fine, don't worry about it, you can have loads of fun (400AWHP+) on a stock block with badBAD blowby.

yes, the service manuals are saying 150PSI+ with a compression variation of 10%, but whatever, they are not running 30LBS of boost.

Re: Compression numbers
 

Leak down test. Maybe you'll get lucky and just need head work.

Re: Compression numbers
 

blow by is not a good thing. and more boost doesn't drop compression. it may be running fine now but who know's. mine ran perfect then one day bam there goes a head and i was having the same problem's with weird compression. you all can say "its fine run it" or "turn boost up while you can" im just gonna say that i told you so right now before your stranded on the side of the road with a trail of parts/fluids behind you.

if you fix this compression problem you will notice instant performance gains at the same boost level's