Aerochargers are better than a twin screw!! hahaha ;-)

[Jeff Meager]

I've helped out on a car with a Whipple twin screw SC, it makes 15psi at
1500rpm, and will hold it all the way from there to redline....

Jeff

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Stephen Andersen
Sent: Monday, 15 October 2001 8:31 AM
To: 'diy_efi at diy-efi.org'
Subject: RE: Aerochargers are better than a twin screw!! hahaha ;-)


The boost curve for the Positive Displacement SC
on aerocharger's web site is about as far from a
"fact" as you can get.  When sized and "geared"
properly for a give displacement engine, a PD
supercharger will provide within about 10-15% of
peak boost given WOT at somewhere just off idle.

The twin screw compressors have extremely high
volumetric efficiencies and don't need to be spinning
very fast to generate boost.

Aerocharger's site indicates that the boost curve
is linear and starts at or near zero.  Way off base...

Steve

Stephen M. Andersen, P.E.                              (302) 326-6405
Technical Director                                    FAX  (302) 326-6401
AdvanTek International, LLC                     Cell   (302) 547-9842
56 Read's Way                               andersen at Advan-Tek.com
New Castle, DE 19720


> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Greg Hermann
> Sent: Sunday, October 14, 2001 8:36 PM
> To: diy_efi at diy-efi.org
> Subject: Re: Aerochargers are better than a twin screw!! hahaha ;-)
>
>
> At 7:15 PM 10/13/01, Nicholas Parker wrote:
> > What a load of crap at http://www.aerocharger.com/tech1.htm
> >My little ol' 1600cc  MR2 with its cruddy 'two-lobe' Rootes
> SC makes 10psi
> >at 3000revs when max is only around 11.5 (by drive
> ratio...),  even the
> >turbo boost curve is not very fair to turbo-heads!!  Who
> ever drew those
> >graphs has probably got holes drilled through his SC lobes
> and in hs turbo
> >compressor housing!!
> >Nick.
>
> Whatever makes you happy. Don't let facts confuse you!
>
> Greg
>
>
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