(rx7) Belt driven superchargers and the rotary

[dom]

The Camden is a roots style positive displacement blower, hence no
intercooler. I have personally run a 7" at 10 psi on a 6-port GSL-SE motor
in my rotary pick-up. The problem with superchargers in general on rotaries
is that the RPM range is to large. Any belt driven device that turns fast
enough to produce boost off idle, is going to be spinning so fast above 8k
that it will shred itself.

The rotary responds very well to turbo charging because of the high
frequency and energy of the exhaust pulses. Have you experienced failures
from the thermal stress on the turbo? You could always go with a peripheral
port motor :-)
-Dom


-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of bill.shurvinton at nokia.com
Sent: Wednesday, October 10, 2001 1:49 AM
To: diy_efi at diy-efi.org
Subject: RE: (rx7) Belt driven superchargers and the rotary


Hi Chris,

I've been looking into this possibility for my Westfield, which is
fitted with a 13B. Atkins rotary supply a kit based on the Camden
supercharger (positive displacement), which they offer in various boost
configurations and infer that it can be used at 6PSI on a NA engine,
despite the old camden installation manual specifically not recommending
this. No intercooler offered at the moment.

I have been talking to CAPA in australia (www.capa.com.au) who recommend
the vortech V5 which should be good for 450BHP. Apparantly someone in NZ
has done a 700BHP drag car with a vortech, but no written references
available.

I guess the turbos are good enough that most rotary owners feel no need
to change.

Rgds

Bill

-----Original Message-----
From: ext Chris Wilson [mailto:chris at formula3.freeserve.co.uk]
Sent: Sunday, October 07, 2001 10:42 AM
To: DIY_EFI at lists.diy-efi.org
Subject: (rx7) Belt driven superchargers and the rotary



Anyone any experience of belt driven centrifugal superchargers like the
Vortech and rotary engines? Was wondering if reducing the thermal stress
that a rotary puts on its turbo(s) in a race environment could be
bettered by a mechanically driven turbocharger.  All info appreciated,
hands on experience, links, anything...

Thanks.

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