>The roots is a decent blower, not my favorite, but perfect for
>making lots of low end if you don't have a screwcharger option. Not
>sure what you'd imagine a "good" blower to be for an SVX, since a
>roots or screwcharger for the SVX run $6200+ for the kit alone...
>and since if you went centrifugal you'd be fabbing a custom setup
>anyhow, for all the work and money involved you're better off with a
>turbo,

I was offered a NOS Whipple-made Lysholm for $1580US, WITH
intercooler (not that an intercooler is needed with Lysholms, but it
couldn't hurt. It would have been custom-fitted.

>and a weddle for when you chunk your tranny :)

I have a G50 Turbo trans, so not much chance of that in my case...

There's a lot of crap flying about regarding superchargers... such as
Paxton claiming that theirs is not a turbo and that turbos are not
superchargers... and which are best.

Exhaust-driven turbos make for good outright power but don't boost at
low rpm and indeed, even with sequential setups, can't restricted
boost-range are unsuited for aluminum-head diesels (the heads
inevitable crack). The exhaust can also be tricky to set-up, is very
bulky and heats the engine bay.

Roots & Eatons, from what I have been able to discover, both have
serious blowby and turbulence problems, and heat the inlet charge
considerably. They were designed in the 1800s (!) as foundry furnace
blowers, and are FAR from hi-tech.

Paxtons are belt-driven turbos, with worse revband problems than
exhaust-driven turbos. At least they don't heat the inlet charge
much... but that's their ONLY advantage.

Lysholms (slang: screw-type or twinscrew), now licensed to Whipple
and Eaton to produce, boost right through the rev-range, suffer no
blowby or turbulence problems, and produce minimal heating.
--
Andrew Grebneff
Dunedin
New Zealand
Fossil preparator
<andrew.grebneff@stonebow.otago.ac.nz>
Seashell, Macintosh, VW/Toyota van nut

HUMANITY: THE ULTIMATE VON NEUMANN MACHINE

DEMOCRACY: RULE BY THE LOWEST COMMON DENOMINATOR