Thread: Supercharged p38

Definitely more of a fan of a few extra cubes over boost right here!

But that's not what this thread is about!

Cheers
Keithy

Originally Posted by benji

Just proves the old saying - nothing will substitute for cubes.

Sent from my GT-I9305T using AULRO mobile app

Turbocharging is an excellent substitute for cubic inches.
If you were to replace the 600Nm SDV6 in a D4 with a non turbo diesel it would require about 9 litres displacement.

Fuel economy, refinement and warm-up times would be abysmal.

Back in my younger days (early 80's) I used to ski race behind a blown 454. Power output of the boat was around 850 bhp torque ??? it was phenomenal!!! Best of both worlds cubes and supercharger . Fuel consumption on the boat makes the Rangie seem cheap to run . To give you an idea running the Mildura 100 (100 kilometres) we would go through a 44 gallon drum of avgas - it was legal back then! Unfortunately, reliability was it's undoing .

Gary

Originally Posted by mtb_gary

Back in my younger days (early 80's) I used to ski race behind a blown 454. Power output of the boat was around 850 bhp torque ??? it was phenomenal!!! Best of both worlds cubes and supercharger . Fuel consumption on the boat makes the Rangie seem cheap to run . To give you an idea running the Mildura 100 (100 kilometres) we would go through a 44 gallon drum of avgas - it was legal back then! Unfortunately, reliability was it's undoing .

Gary

Power ratings back then were all pure bull****. 454's didn't put out much power or torque at all for their displacement. Wikipedia has some sources showing 350hp at the crank and 283hp at the wheels for a 454 big-block. That's a 7.4 litre engine:

Chevrolet Muscle Car Dyno Wars - 1970 LS6 Chevelle - Super Chevy Magazine

320 ft-lbs and 283hp. That's 433Nm and 211kw at the wheels. A turbocharged 2 litre petrol can beat that easily.



It wasn't just cars either. Lawnmower power ratings were also extrapolated into fairy land.
I have a lawnmower with a true 3.5hp engine that is more powerful than any of the 4-5hp mowers I've used in the past.

My N/A 383 small block chev makes 450hp on a street tune... The old 454 myst have been a boat anchor! Except for your blown one Gary ;-)

Originally Posted by Keithy P38

My N/A 383 small block chev makes 450hp on a street tune... The old 454 myst have been a boat anchor! Except for your blown one Gary ;-)

The only big blocks that seem to do okay power wise are on alcohol. On normal petrol I wonder if the cylinders are just too big to get decent air/fuel mixing?

What's the 383 in? I'm guessing it spins pretty quick to deliver 450hp.

The guy that used to build the big block was a drag race motor builder based around Dandenong. I personally would have liked the 427 because it revved better than the 454 but was out voted. The motors would only last 3-4 hours of racing then back for another rebuild. An expensive hobby! Prize money at that stage was minimal, the wet tee shirt competition actually got a bigger cash prize

Gary