Engines with two superchargers

Subtle · Post by **Subtle** » Sat Jan 28, 2006 8:19 pm

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.

douglas vincent · Post by **douglas vincent** » Sat Jan 28, 2006 8:24 pm

Boat motor

douglas vincent · Post by **douglas vincent** » Sat Jan 28, 2006 8:33 pm

Its a Viper

douglas vincent · Post by **douglas vincent** » Sat Jan 28, 2006 8:37 pm

1000 hp twin supercharger BMW 3.6 liter M5 engine.

douglas vincent · Post by **douglas vincent** » Sat Jan 28, 2006 8:38 pm

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

evolutionmovement · Post by **evolutionmovement** » Sat Jan 28, 2006 10:34 pm

That Mercruiser feeds a common plenum.

Steve

vrg3 · Post by **vrg3** » Sun Jan 29, 2006 4:48 am

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

douglas vincent · Post by **douglas vincent** » Sun Jan 29, 2006 5:12 am

Actually, all of them are.

dzx · Post by **dzx** » Sun Jan 29, 2006 6:52 am

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

206er · Post by **206er** » Sun Jan 29, 2006 6:59 am

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

Subtle · Post by **Subtle** » Sun Jan 29, 2006 8:39 am

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

sammydafish · Post by **sammydafish** » Mon Jan 30, 2006 9:31 am

now this is just nasty

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

snowboarded · Post by **snowboarded** » Mon Jan 30, 2006 10:30 pm

I like the banks.

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Engines with two superchargers

Engines with two superchargers