smoke after rebuild

Hozer 88GTConv · 03-14-2004, 11:22 PM

I have a little smoke coming out of both exhausts after about an hour and a half of running after a rebuild.

It is not noticeable at all while driving. The plugs look great. Going to drive it tomorrow, check plugs again and do a compression check.

I only really noticed it when it filled my garage up. Again it is thin smoke, really just a haze. Not a hundred percent sure it isn't fuel.
Hmm, wonder if I should put in some new O2's....

420nitro · 03-14-2004, 11:25 PM

Good luck..
Happy to hear all your noises went away.

88workcar · 03-16-2004, 07:48 AM

I would guess that the motor is not broken in, and you may be getting a little oil by the rings. I have heard stories about heating a motor to a real hot level a few times to "seat" certain types of rings. But before you go worrieing about it put a few more miles on it.

richd · 03-16-2004, 08:02 AM

I've heard that a good way to break in a performance engine is drive the first couple hundred miles constantly varying the rpms across the entire range, ie. idle to just below redline, while not going WOT.

Supposedly this causes everything to be on the loose side, netting more power. Of course, the drawback is some oil consumption from the looseness of the rings, etc.

Never done it, just hearsay. Anybody else heard of this?

Rich D.

stang_racer20 · 03-17-2004, 12:59 AM

more or less right on richd. It helps seat the rings properly into the cylinder. Cam break in is the first step in engine break in though.

Hozer 88GTConv · 03-17-2004, 04:44 PM

Looks like everything seated well. No smoke now, except for some fuel b/c it's running wayyyy rich.

Always something.

03-14-2004, 11:22 PM	#1
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	smoke after rebuild I have a little smoke coming out of both exhausts after about an hour and a half of running after a rebuild. It is not noticeable at all while driving. The plugs look great. Going to drive it tomorrow, check plugs again and do a compression check. I only really noticed it when it filled my garage up. Again it is thin smoke, really just a haze. Not a hundred percent sure it isn't fuel. Hmm, wonder if I should put in some new O2's.... __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

03-16-2004, 07:48 AM	#3
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	I would guess that the motor is not broken in, and you may be getting a little oil by the rings. I have heard stories about heating a motor to a real hot level a few times to "seat" certain types of rings. But before you go worrieing about it put a few more miles on it. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

03-17-2004, 12:59 AM	#5
stang_racer20 Registered Member Join Date: Jun 2003 Location: Wisconsin Posts: 348	more or less right on richd. It helps seat the rings properly into the cylinder. Cam break in is the first step in engine break in though. __________________ 92 Mustang GT, 347 Stroker(Forged Steel Crank/Rods-Balanced, Forged Aluminum Dished Pistons), Trick Flow Track Heat Intake, Trick Flow Twisted Wedge Heads w/ Stage 3 port/polish, 80mm C&L MAF, FMS 30# Inj., BBK AFPR, Trick Flow Stage 2 Cam, Trick Flow 1.6R Rockers, BBK E.L. Headers, Flowmaster Cat-Back, MAC CAI, FMS Pulleys, Griffin Alum. Radiator, MSD Pro-Billet Distributor; AOD, Dynamic 3300 Lockup Converter, B & M Super Cooler, B&M Ratchet Shifter; 3:73 gears.

03-17-2004, 04:44 PM	#6
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Smoke is gone... Looks like everything seated well. No smoke now, except for some fuel b/c it's running wayyyy rich. Always something. __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

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03-14-2004, 11:25 PM	#2
420nitro Registered Member Join Date: Nov 2003 Location: Rockford Posts: 596	Good luck.. Happy to hear all your noises went away.

03-16-2004, 08:02 AM	#4
richd Registered Member Join Date: Jul 2001 Location: Edison, NJ, USA Posts: 125	I've heard that a good way to break in a performance engine is drive the first couple hundred miles constantly varying the rpms across the entire range, ie. idle to just below redline, while not going WOT. Supposedly this causes everything to be on the loose side, netting more power. Of course, the drawback is some oil consumption from the looseness of the rings, etc. Never done it, just hearsay. Anybody else heard of this? Rich D.