Mitsubishi: installing supercharger

"justcurious" <com> wrote in message
news:talkaboutautos.com... 

Depends on the condition of the engine at present. If the compression is
good and even on all cylinders, AND the valve stem seals are not leaking oil
is causing oil burning), then a supercharger (or turbo charger) can be
installed with no real problems.

If the engine has done more than about 160,000 km, then you can do the
install, but it won't last.

Ideally, a rebuild should include new oil pump, rings, (better) bearings
and a head/valve service. Supercharged and turbo charged engines also
usually have lower compression than an N/A engine eg about 8:1 vs about
9.2:1. This is to allow more fuel air to be compressed to bring up the
compression to an equivalent of about 9.5:1. Put another way, a lower
compression allows for more boost than a normal (eg 9.2:1) engine will
allow. You can put in decompression plate under the head gasket, or have the
combustion chambers milled out to reduce the compression. Another way is to
put in dished rather than flat or raised pistons.

With std compression and no intercooler, you'll be able to get away with
maybe 5psi boost. With lower compression and an intercooler, 7-15 psi boost
is possible.

If you have a 4 cylinder, above is all very nice, but why not just get a
Talon / Eclipse 4G63 2.0L DOHC turbo engine thats ready to go std with 195hp
and 205 ft-lbs ot torque. What ever Mitsubishi you have (up to 2002 when the
transmissions were changed and the engines rotated 18- degrees in the engine
bay), it can be made to fit.

Stewart DIBBS
www.vysor.com/lancerproject

gee, that depends on what motor you are considering boosting.





"justcurious" <com> wrote in message
news:talkaboutautos.com... 

Let's say it is a newer celica or acura rsx.

Two engines not designed for it. You might get 10K miles before it grenades,
but you need a low compression engine for decent power on a charger. Neighed
of those are low compression. Of course they are FWD too and wouldn't ever
be really fast.

--
Todd Honea
"justcurious" <com> wrote in message
news:talkaboutautos.com... 

Boosting on engines with either higher compression or cast internals is just
asking for trouble. It can be done, and people will tell you that they've
done it with no problems, but check back with them in a year or so and see
if they're still singing the same tune.

With either of those two situations, air/fuel mixture is more critical, as
is timing and fuel octane. Boosting the cylinder pressure on something with
already higher compression puts undue stress on the internals of an engine.
Superchargers are generally more gentle on the components from what I've
read, but you're still skating on thin ice. 5 psi with an intercooler to
reduce heat (and the chance for detonation) might be doable on your stock
Celica/RSX, but it will probably still decrease life expectancy.

If you rebuild the engine for lower compression and use forged components
(pistons and rods - crank if you can afford it and is available, I'm new to
Japanese engines), and the block can support the kind of power levels that
you're looking to produce, then I'd say yes, you can go hog wild.

JS
1997 Mustang Cobra (stock and *not* blower friendly)
1995 Eclipse GSX (stock and begging for more boost)

"justcurious" <com> wrote in message
news:talkaboutautos.com... 

"If you rebuild the engine for lower compression and use forged components
(pistons and rods - crank if you can afford it and is available, I'm new to
Japanese engines), and the block can support the kind of power levels that
you're looking to produce, then I'd say yes, you can go hog wild."

unless your talking about a motor that going to be ran very hard, stock
internals will work.
the GSX you have will run for years at 17 psi on oem cast pistons.
things just have to be done correctly.



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