Performed compression test: pass or fail???

[dkrugg24]

I performed a compression test on my fully rebuilt 2g gsx and at first of the build it tested 170 across the board and now 300 miles later I notice smoke from the exhaust so I performed the compression test and this is what I got.

From left to right
Cyl.1- 137
Cyl.2- 146
Cyl.3- 140
Cyl.4- 140

Are these results normal after only 300 miles? I also noticed that Cylinder 1 had smoke coming out of it after I pulled the plug but none of the others did. Could this mean bad rings? Or just the rings haven't fully seated on the break in yet and I'm getting blow by?? This is also not a stock rebuild it is a fully built head and block. PLEASE HELP!!

 

[TSicktalon]

ARP 11mm studs with Moly lube are torqued to 80 ft/lbs final, just for clarification. It does state that the torque values are different for oil in the ARP paperwork.

I just did it like 2 hours ago.

 

[dsmcurse]

And break in should be 6/800 miles. .

read through the link

Breaking in an engine.........


but what would David Buschur know...

 

[Dsmkauai]

Well every one has there own methods bro! I still choose to run low boost for 6-800 miles on a fresh motor and work on my tuning, before just pushing 30psi and not giving a crap hoping everything stays together.
Maybe you should read alittle better quoted from your link
"As long as everything is 100% I could care less about a break in"
Its one thing to be a engine builder and tune a motor on a dyno, and another thing to be at home doing it out of your garage!
Procedure I tend to follow
"re-torque on head studs is imperative after 3 heat cycles.
oil should be 10-30 for normal break in {no boost} 1st 100 miles
15-30- 20w50 brad penn or valvoline vr-1 after 800 mile break in
adjustments to the FFOFH may have to be made for proper oil pressure
oil pressure not to exceed 90-100 PSI MAX at WOT"

 

[boost97gst]

Another thing to note: While some stay away from motoman break in I agree with them, only if its a stock build. Most of us are running a little more clearance and thefirst 50 miles will determine how well and how long your BUILT motor lasts. This thing is not stock anymore and should not be broken in "by the mitsu book". Their ptw clearances probably differ from ours, from machinist to machinist most likely but looser none the less. I used a stock t25 for break in and didnt boost above whatever the bcs is set to go off at, maybe 8-11psi?? But running hard for a pull then engine braking is sooooo important. I attribute the break in to my excellent comp numbers. I havent tested in a few thousand miles so i may be jinxin myself!

I was told also to not loosen my arps. Just set to ...trying to remember... i think 90 and follow the pattern. Not one moved a millimeter after breakin. just like the machinist said it wouldnt , he told me i could but it was unnecessary to retorque. Now for piece of mind i still did it, and recommend doing it.

You just gotta put some hard pulls on her and engine break through a few heat cycles, if its possible, then thats the only way you'll get your comp numbers up.