Tuner Question

[sleepychallenger]

Hey all,
I just want to check with you on my thoughts. I am rebuilding a 1.8 from a 2003 Corola for a freind and when I checked it before opening it up it was puffing smoke out of the oil fill and vent tube. My thought was bad rings because it has to be coming from the crank case. I checked the compression and it was 75% less than the other cylinders. My thoughts are that the #3 rings are bad but when I took them out they looked just fine. Could the problem be something that small that I cant see in that cylinder or on the rings? Any thoughts would be appreciated.

 

[Jacksboys]

 
Could it be a blown head gasket? 
 

[Chryco Psycho]

the rings could have been overheated & lost their tension

[360 'CUDA]

It's not this one is it??   (an original wing car)   

[Super Blue 72]

You might want to go on some Toyota forums and ask.

My friend mentioned to me a while ago that the Toyota 4 and 6 cylinder engines have an inherent issue with sludging of the oil due to poor crankcase ventilation. 

This will lead to premature contamination of the oil then premature wear, ie the rings, therefore decreased compression.

Check this interesting article.

http://www.toyoland.com/sludge.html

Hope this is useful! 

[sleepychallenger]

thanks for the replies. it wasnt the head gasket, checked that thouroghly. I dont think that I mentioned that this is a stock 4 cylinder that he had BOOSTED 14 PSI

[Jacksboys]

thanks for the replies. it wasnt the head gasket, checked that thouroghly. I dont think that I mentioned that this is a stock 4 cylinder that he had BOOSTED 14 PSI

Then I would have to go with:

the rings could have been overheated & lost their tension