Show whole topic Jun 26, 2017 11:12 am
rdesalis Offline
Member
Registered since: May 16, 2017
Location: -


Subject: Re: Supercharger
Thanks to all who responded - it's great to have some input.

Since my post, our plans have developed. If it were just a matter of cost, we might spend the money with Derek Chinn, Jeremy Brewster etc. and get our Cozette restored. But the chances of repeat failures are too high, looking at the history of several owners.

So instead, we are planning to design a twin-screw blower, which is the best type you can get (for volumetric and thermal efficiency as well as durability). As it is a compressor like the Cozette, it doesnt heat up the air as much as a Rootes, which is a pump. I can elaborate on this if needed.

First we will build a demonstrator into our 2-litre using a modern twin screw blower, which will look, well, modern. Then, if it works well, i.e. adequate boost, low noise and OK exit temperatures, we will design the rotors to fit inside a Cozette outer housing envelope, so that the mod is completely invisible from outside. This looks to be feasible. We want to do the specs such that the VSCC are happy with it and it wont affect eligibility for events. The logic will be that we are replicating what the Cozette and the Powerplus and the Zoller were supposed to be, but with a durable solution that looks identical.
If the leakage is lower, as I expect, then it may also give improved boost at lower RPM. It should perform better than the Marshall, be kinder to the engine (high intake temps are not good) and look a lot better.
If anyone would like to be informed when a batch is finally available, let me know, but it will take until next year at least.

I would love to find out what was the displacement of the Zoller and Powerplus superchargers used on the 2 litre, as at least one of them was bigger than the Cozette (1530 or 1570 cc per rev), I believe. I simply cant find out online. Does anyone know?