RI-Max

hey guys when i rev my car up or down shift my friends say thier blue smoke coming out of my exhast.

any ideas??? o rings?? i was think??

i have a 2.5 catback, test pipe and y pipe

and 156,000 miles on the motor and i just changed 2 mobil 1 syn. oil ???at 153,000

matty

iTrader: (54)

piston rings...

Blue smoke = burning oil
Black smoke = burning gas

-matt

RI-Max

o thats really freaking great so im guess it gonna blown soon huh???

Kevlo911

iTrader: (36)

do a compression test

RI-Max

what should it be at? psi? i just did one like 3 mouth ago. don't know if i did it right tho. any how 2s

Kevlo911

iTrader: (36)

search for a how to, i will try to find one and add it to the how-to's section.

i think it is suppose to be around 175-185

RI-Max

whats if 2 low??? motor gonna blow??? or what if its good?

drewm

I hear if you switch to synthetic after 100,000 miles you'll have that exact problem.
Go search.

RI-Max

can i switch 2 regular??????????

KWheelzSB

iTrader: (1)

Regular (Dinosaur) oil, I assume you mean? Sure, but it won't likely change the blow-by you're experiencing.

The only thing that might help (short of repairing the engine) is a slightly heavier grade of oil. Check your manual for the acceptable range.

You either have a piston ring problem or a valve problem if you have oil blow-by into your exhaust.

You're not likely to "blow" the engine as a result of either of these problems, but left unchecked, you will certainly experience premature failure of O2 sensors and possibly your catalytic converter. Also, if your state requires emissions tests as part of registration renewal, you will likely fail the emissions test.

Definitely do a compression test & see what you come up with.

RI-Max

i was read if i wanna change back 2 regular oil(castrol GTX) (as i was using before) i have 2 run regular oil then drain it. then refill it and it should be ok. or do a oil flush. which was down at 146,000. right????????



and i'll do a compression test 2 morrow at work.

speedemn

iTrader: (14)

No... I have the same problem as you. My blue smoke is hardly noticeable but I seem to burn quite a bit of oil... 1L every 2 weeks or so and more if I am on it quite a bit.

I did a compression test and all my cylinders are 175-180... so definetly healthy. If you get good results then there is nothing to worry about. But likely it is your rings that are wearing down. Use an oil that is meant for higher mileage engines... they have seal treatment chemicals in them.

I was advised to use Castrol GTX 10W30 by people on the org.

RI-Max

really 10-30w wtf i just bought some 5-30w grrrr i neva win lol

nismomaxima97

Holy **** Anish 1L every 2 weeks is a **** load to burn man.Are you sure that your cylinders are fine. There is no way you should be losing that much oil, 2L a month It has to be your o rings, bro. Out of curiousity how did you do your compression test???
Ciao
-Alin-

speedemn

iTrader: (14)

Yep it is quite strange... no oil leaks either... car looks clean (tiny hint of blue smoke when I floor it) from behind.

I got a compression tester from Canadian Tire. Justin used the same one on his motor. When we used the tip at the end, my compression came out to about 175 average... when we took that tip off, it was an average of about 185. Variance was no more than about 5.

Yes looks like my rings are the culprit, but as long as compression is good, nothing to worry about for now. But I have started to research internals and rings along with that... beef up the VQ...

RI-Max

just did a compression test and i got 150 psi. and i change back 2 castrol gtx 5-30. is that low compression?

matty

iTrader: (54)

An engine is in bad shape when you have cylinders with drastic difference in PSI...Example 170 171 172 158 170 157...good would be 170 172 173 171 170 171...all in a good range
150 does seem alittle on the low side. New is 210 I believe

Did you test all the cylinders or just one ?>

-matt

speedemn

iTrader: (14)

What was the reported compression across each cylinder? Can you list them? They shouldn't be off each other by more than about 10psi I believe...

Overall 150 is a bit low I think, but as long as they are all 150 +/- 10 then it's all good... how many miles are on your motor?

RI-Max

they where not far from each other. not more then 10psi on diference.

so im guessing im lossing hp right

motors has 156,000

matty

iTrader: (54)

as long as those numbers are close, even know there kinda low, your alright...if you have money, get a NEW engine

-matt

speedemn

iTrader: (14)

what matty said.

waveridr85

iTrader: (4)

what causes the lower compresion? is power lost the lower the compression? hoe can i fully restore the compression?

matty

iTrader: (54)

Get the engine fully rebuilt, or buy a new engine with lesser miles (20-30K)

-matt

RI-Max

ok y do i have low compression??? any ideas??? isn't lower compression good foe boost???

evad513

this is what you do if you burn oil....first never use the synthetic oil unless your car comes new from the factory with it already in the car. non-synthetic oil tends to fill the grooves in the cylinders that your pistons and rings put in the walls of the cylinders. Since non-synthetic oil has a little higher of a resistence and a little less protectiveness you produce the grooves in the cylinder. so basically you have to change your oil and filter asap, switch back to what you were using before. If you are still burning oil take it up a step to like 10-30...just let your car warm up before you drive it...you should actually always so this because if you don't there isn't enough oil in the cylinders to "slip" on so you produce deeper grooves. it you are still burning oil step up to 20-50 but, you must warm up you car before driveing....after all this if you are still burning oil switch to sae 30 weight oil in the summer and 20-50 in the winter....by doing these steps you will a). stop burning oil or b). know that you have a serious ring leak and should prolly get you engine re-built or replaced...and just as a side note....NEVER get you engine flushed after 50k miles....it washes the oil that fills the grooves out and you will start to burn oil...you want that older, harder oil in the grooves...good luck....I don't believe you have to get you engine replaced I think this is all because you switched to synthetic...

dave

spirilis

iTrader: (2)

Low cylinder compression pressures is due to some of the compressed gases leaking past leaky parts... e.g. worn piston rings, worn valve guides, warped (burned) valves, broken head gasket, cracked cylinder head, etc. It is bad for performance and fuel economy, and depending on the root cause of the compression problem, could become worse as you continue to drive it...

Bottom line, occasional burned oil usually means the engine's becoming "worn out". It'll still run, it just won't run like it was brand new...

FYI, "low compression" being good for boost... not in this case. The "low compression" they talk about with boost is static compression ratio, which is determined by the dimensions/geometry of the cylinders, head, pistons/rods/crank... basically how much the gases are compressed during the compression stroke. This "low compression" we're dealing with in this thread, is improper sealing/leakage of gases... this type will be bad for both N/A and boosted applications.

I agree that switching to synthetic at such a high mileage was a bad idea, but hopefully not catastrophic--try a HIgh Mileage oil like Castrol or Valvoline MaxLife... I had good luck with Valvoline MaxLife in an old Mazda I owned from 160-180K miles. It helps keep those worn seals together and prevent them from getting worse.