VNTEC

My car runs really rich while cruising.. some spots i get 12.5 AFR's. In boost its usually 12.5-12.6 AFR throughout... I notice some smoke coming from my exhaust when getting on it (having another friend drive my car) Not too sure what the color was.. Here are my compression test results

180 160 150 150 - This is on a 11 Year old block... WHen i rev my car at idle small amounts of smoke comes out of the breather.. BUt if my compression is good could it completely rule out that my ringlands are bad? My car still runs fine, doesnt burn coolant, oil is good, and thers no oil in the coolant, THanks for any help

boosted_dc2

well for one, 12.5-12.6 isnt a good air/fuel ratio to run.

also you can have good compression, but still have bad rings/ringlands. however you DONT have good compression. thats low, and with the smoke, i am willing to bet that more thatn likely ALL your ringlands are broken.

Landon

onePOINTsix

your ring lands could be going bad. i'd suggest not to push it hard and start saving for a rebuild. Oh BTW fix that A/F for crusing, but a 12.5:1 is good from WOT, that is close to making max power in a turbo car. If you have Hondata/Uberdata log it and see which cells your in as you cruse and then adjust them as nessary

edit: i'm betting you washed your walls with fuel because your running so rich crusing, intern causing your rings to get fuct because of no oil

0xenocron

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted_dc2 &raquo;</TD></TR><TR><TD CLASS="quote">well for one, 12.5-12.6 isnt a good air/fuel ratio to run. </TD></TR></TABLE>

This is a dumb statement...please no one listen to this advice.

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I'm guessing what the guy said about washing your walls with fuel...but redo your compression test...and drop a teaspoon of oil in each cylinder and test again. If compression goes up...your rings are bad.

Make sure your engine is warm doing your compression test.

boosted_dc2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sideout &raquo;</TD></TR><TR><TD CLASS="quote"> but a 12.5:1 is good from WOT, that is close to making max power in a turbo car. </TD></TR></TABLE>

runing this lean daily on a motor that old will definetly creat problems, depending on the fuel setup.

landon

yellow blur

Lean? That's considered a safe rich zone for FI cars. Where are you getting your information?

Drew Peacock

Did you disconnect fuel pump when doing the comp test? I think the results are alright if this is not a dohc vtec engine, you will always get a little bit of smoke out the breather. Try redoing the comp test if you had fuel going in there the first time.

quickergixxer

make sure to hold it at WOT when doing the test, my 9:1 is 180 across the board when i was running stock bottom and busted up the piston i was at around 120 and puffing perty good out the breather at idle

m R g S r

Actually, that is a slight bit lean. Most tuners on here like to keep a consistant 12.0 to 1 Air to Fuel ratio. So if you have 12.6 parts air to 1 part fuel, that is LEANER than most people are running.

Teg4e

My tuner tuned my car to 12.8:1 a/f. i was a bit concerned about this, but he explained that he made it safe all with the timing. i trust his judgement, since he's been in the game a while now. My compression's bad, but that all happened when I was boosting 6.5 psi on the 12:1 FMU system. I'm now pushing 10 psi, and the leakdown hasn't gotten any worse.

1316130057

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">well for one, 12.5-12.6 isnt a good air/fuel ratio to run.</TD></TR></TABLE>

This is false.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">runing this lean daily on a motor that old will definetly creat problems, depending on the fuel setup.</TD></TR></TABLE>

False again.

12.5-12.6 is pretty good for a turbo car. Running that kind of AFR on a turbo car will cause approximately 0 problems. If you're still N.A. then you'll be rich as hell and will lose power bigtime for it. You certainly won't be lean. Maybe by comparison to say...10:1 you're lean, but from the real world definition of lean (14.71:1+) you're rich.

In either case, there's nothing wrong with your ring lands (which are the ridges on your pistons that your rings sit on). With the smoke you're seeing (which, based on the age of the car and probable mileage) is likely blowby, I'd put money on it that it's just some basic rings. Nothing to kill your self over. Just replace the rings, or racebuild. BTW, you're about 40psi shy of new.

VNTEC

Wow thanks for all the great responses, one of the biggest helps i've gotten so far I have a Techedge Wideband and here are some logs of my AFR

1st gear
12.0,4538
12.3,4901
12.4,5305
12.2,5698
12.3,6048
12.0,6282
11.9,6543
12.0,6085
11.1,5545

2nd
11.4,5080
11.6,4842
12.2,5084
12.1,5231
12.3,5415
12.2,5484
12.2,5736
12.1,5876
12.2,6024
12.2,6166
11.8,6329
11.8,6444
11.7,6586
11.6,6666
12.2,6369


3rd
11.0,4819
11.9,4823
11.8,4914
12.0,4979
12.2,5110
12.2,5106
12.2,5128
12.3,5333
12.3,5361
11.9,5489

Its better then i thought hehe... I'll try dropping oil in my cylinders, i did the compression test many times, fuel pump disabled, and WOT...... darnit i hope its okay
71,12.1,5540

SL0WEGG

i think its your ring lands bro. same thing happened to me. when smoke is coming out of your breather. i believe its called blow by. ring lands are going out. time for a build up

Drew Peacock

A/F seems fine was the car at operating temp when you did the test?

VNTEC

Did the test not to long ago.. Man i wish my camcorder still worked, i used to record EVERYTHING, i just gotta send it in to panasonic however... I recently did the test about 3 days ago, that AFR reading was from today. Hear some knocking noises, could be from my block, dont get any blow by at idle, i have launch control, so when i rev high smoke comes from out of the breather, then as my engine idles u can see smoke puffing from my exhaust (very light however) Can it be the tune? Most likely not huh?

boosted_dc2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by m R g S r &raquo;</TD></TR><TR><TD CLASS="quote">Actually, that is a slight bit lean. Most tuners on here like to keep a consistant 12.0 to 1 Air to Fuel ratio. So if you have 12.6 parts air to 1 part fuel, that is LEANER than most people are running.</TD></TR></TABLE>

thank you.

12.5:1, is considered a slight but lean. can you run it safely??? yea, with proper timing. however, any tuner will say that they woul rather see it in the 11.5-12.0 range.<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1316130057 &raquo;</TD></TR><TR><TD CLASS="quote">

This is false.

False again.

12.5-12.6 is pretty good for a turbo car. Running that kind of AFR on a turbo car will cause approximately 0 problems. If you're still N.A. then you'll be rich as hell and will lose power bigtime for it. You certainly won't be lean. Maybe by comparison to say...10:1 you're lean, but from the real world definition of lean (14.71:1+) you're rich.</TD></TR></TABLE>

if you run a 14.7 ratio on boosted car, it wont last long at all. so to compare the numbers from a N/a car to a FI car is wrong. there 2 completely different entities and should not be compared.

every tuner i talked to says that 12.5:1 is on the lean side

Landon

boosted_dc2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1316130057 &raquo;</TD></TR><TR><TD CLASS="quote">

In either case, there's nothing wrong with your ring lands (which are the ridges on your pistons that your rings sit on). With the smoke you're seeing (which, based on the age of the car and probable mileage) is likely blowby, I'd put money on it that it's just some basic rings. Nothing to kill your self over. Just replace the rings, or racebuild. BTW, you're about 40psi shy of new.</TD></TR></TABLE>

have you seen the stock internals of any honda that has been boosted, that has low compression??? ive never seen just the rings bad in a honda, it has always been the lands. id put the money on it that it is ringlands, and i have paypal if you'de like to bet

Landon

1316130057

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">every tuner i talked to says that 12.5:1 is on the lean side</TD></TR></TABLE>

What ever you say man. I'm not going to argue about it.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">have you seen the stock internals of any honda that has been boosted, that has low compression??? ive never seen just the rings bad in a honda, it has always been the lands. id put the money on it that it is ringlands, and i have paypal if you'de like to bet </TD></TR></TABLE>

Yeah. I have paypal as well and I'll put $10 on it.

Vtec92Civic

12.5:1 is not lean fromw aht I have read from numerous peoples setup on this site 12.5:1 is rather rich, yeah you can go richer and some people do, but 12.5:1 is not bad at all.

vaporboy12

could be valve seals

boosted_dc2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1316130057 &raquo;</TD></TR><TR><TD CLASS="quote">


Yeah. I have paypal as well and I'll put $10 on it.</TD></TR></TABLE>

okay, everybody here is a witness.

Landon

1316130057

Deal. Obviously, there's no funds to exchange if it's something neither of us stated thus far. You of course saying ring lands, and me saying rings.

boosted_dc2

yea, i highly doubt this kid is tearing his motor down though unfortunately.

Landon

1316130057

Are you backing out you...you...back-outer!!

boosted_dc2

no man, im seriously down for the bet. i hope the guy tears it down, but i dont see it happening unfortunately.

Landon