rdesalis

16 October 2018 at 14:59 #52890

Thanks Colin – interesting thought. I think there is something wrong though. It has only developed this trait in the last few years. The clutch stop unfortunately cannot stop it, as the drag is so high, however it is adjusted. I wonder if part of the lining could be coming away.

rdesalis

15 October 2018 at 15:22 #52888

Hi all,
Our 2 litre (1931 SC) has a clutch that engages fine, no slip at all. It disengages fully at idle speed. But at higher revs, like 1500 RPM, it develops drag – enough to prevent you pulling it out of gear. Is this a well known fault? Any ideas? Also the clutch adjustment procedure hasnt been done for some years. Does anyone have it in electronic form that they could send me rdesalis@umich.edu ? Thanks!

rdesalis

1 July 2018 at 21:00 #52835

The cycle wings (turning with the wheel) have a stiff black fabric mudshield on the inner side, which extends from the steel wing to the aluminium backplate, with steel brackets behind it. Our 2 litre has these, but we want to replace the material. Does anyone know a suitable material? Cant quite figure out what it is.

rdesalis

26 June 2017 at 11:12 #52412

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?