[alfa] Re: GTV6 Oil Consumption

[Jon Pike <jhpike@xxxxxxx>]

> Can anyone provide any pointers on determining whether oil smoke in 
> > the exhaust is coming from ring blowby, or leaky valve guides, or 
> > both (or anything else that might introduce oil into the combustion 
> > chamber)?  I'm contemplating some sort of partial rebuild on my GTV-6 
> > engine, and I'd like to know what's causing the worst of the oil 
> > consumption, and target that specifically.
The classic behaviors I believe are,  if you have continious smoke under 
heavy accelleration, it's the rings,  and if it appears occasionally,  
either after a long idle,  or after a long throttle off deacelleration,  
it's the valve guides.    Best way to get the valve guide smoke is to 
rev high,  then do a long throttle closed deaccel thru a few gears,  so 
there's a good time of high engine vaccum.  Then when you hit the gas,  
you'll know..

Slower speeds during testing help,  because a surprising amount of smoke 
can be diluted by lots of "airspeed"..   Having someone chase you and 
observe,  or driving the car while you chase and watch might be ideas.

Doing a classic leakdown test might shed some light as well.

Hope it helps...

Jon
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