What about reducing supercharger speed via a pulley reduction or
enlargement.
A full wide open charge would eventually blow up the works.
Joe is correct. I had a Corvair Turbo that we changed the pulley size to
increase blower pressure.
Ran like a scalded dog for about 1,000 miles.
Way fun.
But it eventually blew a head gasket on the way to eating all the valves via
the top of the piston.
I really believe we could have driven that car as it was from the factory
over a 100,000 miles if we hadn't played around with the pressure.
I didn't check to see if the Shorrocks had a safety blow out or not.
Just my .02
-----Original Message-----
From: Joe Curry [mailto:spitlist@gte.net]
Sent: Friday, January 04, 2002 11:23 AM
To: Dr T. Dafforn
Cc: Nolan Penney; Spitfire Internet Mail List
Subject: Re: Forced Induction
"Dr T. Dafforn" wrote:
>
> Supercharging the spitfire engine was a period method for
> giving a performance boost. In fact there is documentation from the 1960's
> showing a shorrock supercharger installed on a triumph Herald (spitfire
> engine). The setup was reaconed to give 2l performance from a 1.3l engine,
> so not bad!
> Fuel delevery was via a "suck through" SU (HS6 I think), although you can
> use a blow through set up if you take a HIF style SU from a turbo Rover
> Metro, Maestro, or Montego (Common Rover (British leyland) car over here).
> Oiling the supercharger was achieved by a take off from the same place as
> the external rocker suply kits.
> Its is also true that the compression was reduced (I have the details some
> where).
> So it is possible to blow a spitfire, the biggest problem is getting a
> shorrock supercharger, cost about 600 pounds WHEN you can get hold of
> them!!
I agree it is possible to "Blow" a Spitfire. That is what my study in
adding a supercharger showed.
If you Supercharge it, you will likely "blow" it up! :)
But seriously, the cost of doing it is very high in terms of r&d and the
resulting reliability is very poor compared to that of any modern engine
that
would deliver as much power with Fuel injection rather than a blower.
Joe
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