legacycentral bbs

In 1951 Formula 1 rules were 4.4L unsupercharged and 1.5L supercharged.
On the latter, Alfa Romeo was formidable with its in-line 8-cylinder,DOHC engine. In 1938 ,with a single Roots blower it developed190HP at 6500 rpm.

At its maximum developement in 1951 the output was 404 HP at 10,500 rpm, from two-stage superchargers. Races typically lasted for about 4 hours. Without intercooling, huge amounts of alcohol and other exotic additives were used to chill the charge and to stave off detonation.

That's 404 hp out of 1.5 L in 1951!

Fuel consumption was 1.5 mpg, which became hopeless as Ferrari's 4.5 N/A developed enough HP in 1952. Alfa retired when they were ahead.

Boat motor

Its a Viper

1000 hp twin supercharger BMW 3.6 liter M5 engine.

All of these appear to have a single supercharger feeding separate banks of cylinders.

That Mercruiser feeds a common plenum.

Steve

I can't tell for sure, but those are centrifugal compressors oon the Mercruiser, aren't they?

Actually, all of them are.

I saw a twin supercharger on car and driver tv a few years ago. It was on an old GTO

Ive seen some hot rod with a big block that had twin 6-71's on it.

By two-stage supercharging they meant the first one pressurized the second one.
This was also the case with the Rolls Royce Merlin of World Two that powered the Spitfire, P51 Mustang fighters and the Lancaster 4-engined bombers.
This was a dohc V 12 engine with a 4-valve head and two plugs per cylinder. Displacing 27L it was rated at 970hp at 12# boost at 2600rpm @ 12500 feet. That was in 1938. By the end of the war it was stretched out to 31L, called the Griffon and was putting out some 1800hp.
The sound of this engine is incredible--Straight out exhaust stacks that in poor light could be seen belching flames.

It makes going to an air show worthwhile

now this is just nasty

http://www.lambocars.com/archive/diablo/vtalpiness.htm

I like the banks.