turbos

[Mark Agnello]

> > If you
> take a stock non-turbo 
> > engine and put a turbo on it, what is it exactly
> that causes failure.  

Detonation is usually the killer.  It is usually
caused by high intake charge temperatures, too much
spark advance, too lean air/fuel ratio or a
combination of these factors.  

Generally, this is a bad idea unless the engine is
understressed to begin with.  You fail to mention if
your target engine is 4,6, or 8 cylinders.  Mild boost
on a high compression V8 may be OK but 9.0 compression
ratio on a turbocharged 4 cylinder is too much unless
you restrict boost to < 7 psi.  Another factor to
consider is that factory turbo engines are usually
designed to handle the added heat and stress.  I own a
Toyota 2.0 liter turbo and compared to the non-turbo
version, it has better pistons, valves, and oil jets
that squirt  cooling oil on the piston skirts.


=====
Mark Agnello
Washington Crossing, PA (USA)
88 Toyota Celica All Trac Turbo (restoration project)
92 Toyota Celica All Trac Turbo
96 Honda VFR
89 Honda Hawk GT (restoration project)

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