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Originally posted by the
Is just throwing a supercharger or turbochargers on a bone stock 150,000 mile engine a good idea?
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If you check out the exploded view above, the 928 motor is built with what- on any mere mortal engine- would normally be a 'race only' full main stud girdle(as well as head and main studs), and uses an "Alusil"(aluminum silicone) alloy block so hard that it doesn't even require steel cylinder liners!
There are a lot of guys with supercharged hi-mile 928 motors on the 928 sites, especially rennlist. One of them that's running a supercharger has 180k miles on his i think.
To give an idea of the strength of these motors, i missed a shift a couple months ago, and watched the tach on mine wind past 9k RPMs(and nothing broke!)......talk about a pucker moment!
The motor is everything you'd expect from a Porsche V-8 flagship engine, and then some. When i got out of the service i used my GI bill money to get a trade school auto tech education, and worked in the field for close to a decade. Having worked on all manner of hot-rods and cars, i have never seen an engine as well put together as that of the 928 in any other car in all my days.
It is an engineering marvel, and a true masterpiece of design....IMO, of course.
The one drawback to the 928 engine is it's weight. It is a very heavy engine(esp. for an alloy one), but that is due to it's overly-robust construction.
LS series GM motors are also great motors(and known for their fantastic light weight), but to maintain the true "Porsche character" of a car, a 928 V-8 is IMO the way to go over a GM motor.