My question is, how long does it take to melt a forged piston at 25 psi lean?
I know it depends on how lean, how much timing advance, ambient temperature and
a half dozen other things, but if you get on it, it slips past 15 psi and flies
up to ~23 psi and you let off right away, is the chance of short block damage
pretty high?
I haven't done enough hot rodding to find out.
Just an fyi... when you do a bunch of engine braking, and then touch the gas
and see a plume of smoke out the back, that is bad rings doing that if its not
coolant blowing out there from a bad headgasket. Someone correct me if i'm
wrong, but under engine braking, there is vacuum in the combustion chambers all
the time. Rings are designed to seal pressure in the combustion chamber moreso
than the vacuum in there, and oil consumtion like this is normal to a certain
degree. Never should it be visible out the exhaust though. Different ring
designs seal the vacuum better than others, but the ultimate result is oil
getting sucked into the combustion chambers and burned up. If the rings are in
bad shape, this suction is like shop vac hose in a bucket of oil.
When you engine brake down the mountains for lots and lots of miles, you have
to be careful because engines have good potential to consume lots of oil doing
this.
It still is burning the oil when you're on the gas, but instead of going out
the tail pipe, those combustion gasses are ending up in the crankcase and out
the pcv.....
Pistons may be fine. Sometimes the rings give out first. Any compression
tests?
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