no, you use a shaft to drive the turbo instead of the exhaust gases. theres a few setups like it and me and my bro are gonna give it a go and see what happens.

Oh and doc i ahve checked out the work you did on that manifold before, very slick job, i may end up doing that just to smooth out where the gas flow has eaten away at the joins of the manifold more than in other parts.

oh and i think "Stay away! This relic could blow at any moment!" would make a great bumper sticker

_________________
1962 850,Frog

EAB,,, they generally use the sharft drive to the "gear" drive mech ,,, "overdriving" the turbo to get the desired force.

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

The first thing you will find is the bonnet will not shut.

Then you may find that it will run crap as the fuel will separate from the air as it tries to take the hairpin bend and the fuel will run down the back wall of the manifold.

I saw a picture of one where they'd machined teeth onto the flywheel and ran a belt to a little gear on the turbo - nicely overdriven!

what's the shaft RPM requirement for an average turbo making average boost?

_________________
did I tell you that I won a trophy?

i think from memory around 30,000 rpm so slightly geared up from what the engine is doing

_________________
1962 850,Frog

That flywheel driven one was in Miniworld a few years back.

'Twas an awesome machine.

_________________
1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

depending on the wheel and compressor size u use. Most turbos will spin 100,000rpm + on boost , if u used a much bigger front housing u could spin it a lot less to reach the desired boost .

_________________
1152cc turbo A-series now with 125.7hp at the wheels !

AUSSIE Turbo mini forum >> http://boostmini.justboard.net/

https://www.facebook.com/boostmini

Ever thought of putting a DGAV 32 36 on it and make your own manifold that what I did worked great no mods to do.

getting the parts to make this thing up this week, i'll let you know how it all goes. should be interesting!

_________________
1962 850,Frog

i just had a thought which i havent thought out at all BUT

what if the exhaust hases at higher speed put out enough force to spin up the turbo faster then the belt drive u are using? could u make a belt drive that allows u to spin up the turbo initially but dissengages as the turbo spins faster then the belt can turn is? a little like a boat winch on a trailer spins? would be a tuning nightmare but just a thought to be falsified and analysised by those with more then my back yard bobs approach to mechanics

_________________
Enjoy Chris