a1320honda

So i just did a factory rebuild on my GSR bottom end. It was sitting in a shop for like 2 years and had about 90k on it. I just did a quick hone and new rings and bearings. Its got some blow-by and smokes a little bit of blue smoke but after 20 miles compression numbers are 185-190-195-190, and my gauge reads a little low compared to others. So it should clear up after another 100 miles or so shouldnt it?

B18C_EJ8

How are the valve seals?

a1320honda

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C_EJ8 &raquo;</TD></TR><TR><TD CLASS="quote">How are the valve seals? </TD></TR></TABLE>

Their good, just replaced about 2 months ago

crowder13

should clear up soon, i would change the oil again around a 100 miles after rebuild and again after 1000 miles to get all that metal outta the motor

a1320honda

i thought those were pretty good numbers for comp. after only 20 miles.

RC000E

Yeah, that's pretty descent numbers....especially if your gauge reads low (time to get a new one). My motors smoke for a little because I really slather everything up with oil, but generally after about 15 miles on the motor it's gone. I notice when I do the heat cycling at idle in the motors initial life, that that won't burn off everything, you need to have some load it seems.

I actually just got to about 22 miles on my LS/vtec tonight and I'm clear all around now, but I was smoking a bit when I first hit the street. This GT30 sure feels fun...never had a ball bearing turbo for myself before .

a1320honda

ya it seems to be slowly getting better. It doesnt help that im on a huge turbo and running off wastegate (7psi) and my vtec ecu doesnt work, so im running with no vtec.

SPOOLINmatt

ive never had a fresh rebuild smoke, except for fuel smoke limping it on the dyno.

XSIintegra

Had a really bad smoke issue once from bad gas...and not the bean burrito kind

a1320honda

ya its blue smoke.

B20luda

a freshly rebuilt motor shouldnt smoke... and just because you have good compression, that dosent really say anything about the oil control ring being installed properly or broken etc etc.. when does it smoke, idle, WOT, decel??

a1320honda

slight smoke at WOT. I called around just a bit ago and most motor shops said its completely common for it to smoke for the first couple of hundred miles while the rings seat.

quicksilver1689

did you baby it during the break in process or did you put light load and high rpm's?

PirateTypeArgh

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by quicksilver1689 &raquo;</TD></TR><TR><TD CLASS="quote">did you baby it during the break in process or did you put light load and high rpm's?</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">slight smoke at WOT.</TD></TR></TABLE>

Chris Tune

it shouldnt smoke after the first 2 minutes of start up. if it does something aint right

PirateTypeArgh

it sounds like he may have pushed it too hard and not let everything break in and settle before.

Chris Tune

thats hard to believe, i have built/tune cars that i have on the dyno doing WOT pulls about 2 hours after initial start up, and they dont smoke.

sc4dr

I've seen a lot of race cars smoke, and hold up for quite some time. shrug

Chris Tune

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sc4dr &raquo;</TD></TR><TR><TD CLASS="quote">I've seen a lot of race cars smoke, and hold up for quite some time. shrug</TD></TR></TABLE>

yeah mostly turbo cars, some people KNOW its the back seal of the turbine side of a turbo and they dont care, takes time from the shop to fix it and that = losing money... you know the rest.

sc4dr

Yup. Just think of it as being a little loose, so you can run more boost.

fast2camciv

i have built 3 piston/rod sohc blocks, and i just did my first piston/rod dohc motor and NONE of them smoked at all...the motor seals right away, i tend to think something might be out of wack...maybe not going to be the death of the motor, but never the less something isnt to spec.

SPOOLINmatt

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris Tune &raquo;</TD></TR><TR><TD CLASS="quote">it shouldnt smoke after the first 2 minutes of start up. if it does something aint right</TD></TR></TABLE>

yep, rings dont seat in a couple hundred miles, they seat in the first 2-5 minutes of running.

sneakysneaky

What did you set the ring gap at?

SOHC_MShue

it all depends on the motor. I remember one time i was tuning a lsvtec turbo that was fresh built. It smoked all over the place for the first hour of tuning and then after that everything cleared up and the compression was 190 straight across. Some motors i dont hardly see smoke at all.

B20luda

any oil in the DP or charge pipes? oil return flowing ok no kinks, placed right, no swelling rubber hose...etc etc...