[TR] Classic Motorsports Article on Supercharged TR6

[Randall]

> I'd think the MGB supercharge would be easily modified for 
> the TR4 as  the 
> displacement is similar...no?

Finding a suitable blower isn't the hard part; it's getting it hooked up to
the motor in a reliable fashion that's a pain.  Especially if you want to
include some sort of valve so the blower isn't sucking power even when it's
not doing anything useful (what I believe Accel used to call a "priority
valve").

Blowing into the carbs isn't such a good idea, as they don't like changes in
air density (and a blower is all about increasing air density).  So now you
have to link the blower outlet directly to the intake manifold, and a carb
to the blower intake (ignoring the priority valve that needs to connect in
both places). 

Unless of course you convert to fuel injection at the same time (which is
probably a good idea, but a whole nother ball of worms as well).

Blower sizing also depends on how much boost you plan to run, and what ratio
you set up between the blower & the crankshaft.  As I recall, the MGB is
only 1800cc, so if you keep the same drive ratio, it's blower will make less
boost on a 1991cc TR3, less on a 2138 TR4, and even less if you've put in
the 87mm liners.  Of course you can overdrive the blower ...

Randall