second the piston ring idea......go ahead and get marcelos

 

we will see its mild build time

 

piston rings for sure. I am in the same spot building my motor now.

 

just curious....how are you guys comeing up with the piston ring idea when compression has been established and comes out high?

 

crush- we are thinking piston rings oil ring to be specific for a couple reasons. First smoke came out of one of the cylinders when we removed the spark plug. Second the rough idle. Plus the exhaust smoke for which we have eliminated the turbo and head gasket. As far as the raised cylinder pressure it was explained to me if there was oil in the cylinder it could raise the pressure

 

valve seals maybe....any damage to the valve stem can kill a valve seal or just a crappy valve seal....just a thought...that would explain the oil and the ability to have good compression...mostly what iv seen is when rings go bad is a low compression...much lower than the other cyl...again just a thought.

 

gotcha. A leakdown would show for sure right?

 

not for a valve seal i wouldnt think....it will rule out piston rings or bad valves (valves that are bent and maybe not seated properly for example)...

valve seals are cheap but you pretty much got to rip apart the head to replace em...take that back you will have to rip apart the head...lol

 

http://www.statracing.com/oem-replac...426&category=A

http://www.statracing.com/oem-replac...427&category=A

 

http://www.autopartsworld.com/scion_...emoilseal.html

 

a quick test for bad valve seals is:

Leave ur car overnight....

have someone stand by the exhaust and start the car...if smoke comes out its your seals..

also let ur car idle for about 30 mins...if it starts to smoke its the seals

also go and hit boost in say 3rd gear but let off at about 5500rpm and let it decel in gear...if u have smoke then its 100% valve seals...cause the vacuum is pulling oil past the seals into the chamber

 

See i was thinking something about the valve seals but was not to sure cause i have not ran into that problem before. Anyways just go ahead pull the motor apart and build it up. It will save you in the long run lol

 

yep thats whats happening. Pistons, rods, bearings, studs, and balance shaft removal

 

i dont think its yoru rings... compression isnt off by much on all your posts about it.. if it was a blow ring the compression difference would be much much greater... also the numbers are determined by how many cranks you do...

id investigate further and leaning towards something else... you'd also notice a blown piston ring if you hade a decrease in power...

 

leakdown test is upcoming.

 

I agree with many of the members here.

You are jumping to conclusions. Perform a leak down test and see where you stand before you actually do tear down. Your compression numbers are decently high. I wouldn't expect to find much.

Perhaps you have a bad misfire related to the ignition system.

Whatever you come up with good luck and if you need any parts let me know and I will see what I can do

 

I know this may seem obvious but you'll be surprised...

Disconnect the ground off the battery for 5 minutes. Leave a door open to fully discharge the car's electronics. Start it back up to see if you see smoke.

If you unplug the MAF or o2 and reconnect it without resetting the battery, the ECU will ocasionally go in dummy mode and tons of white smoke will pour out the back.

Like I said I know it seems obvious but give it a shot. White smoke usually has nothing to do with oil seal issues. Typically that's a coolant problem.

 

joe- ill try that when i get home.

Don- i agree thats while im doing the leakdown test

 

Light amounts of white smoke can be fuel and oil

Heavy amounts of white smoke is coolant.

 

I concur. Perform the leak down and compression tests and report back.