Noah,
> Here is what I hope is my last question- what about period
> superchargers? Ive seen a judson, and contemporary reviews
> give it about a 25% increase in actual power...
Period superchargers are cool... but that is about where their effectiveness
ends. The 25% increase in power is probably a decent estimate from the
review, but I guess your cam/carb combination right now is going to put you
pretty close to that figure anyway.
> -what is the shorrock system, how does it compare to judson?
Favourably. Downside of the Judson is it is high-maintenance and not very
efficient. Both are off-balance, vane type superchargers... shifting of the
rotating vanes increase and decrease the volume between the vanes, as they
decrease in the volume the intake charge trapped between the two vanes is
compressed. By off balance, I mean that rotating assembly inside is not
centered in the housing, this is what allows for the vanes to change
displacement.
> -what is the downside to doing this, except for price, and the
> normal engine wear from increased HP questions?
Current views suggest anything short of 9psi has no significant effect on
the longevitity of your motor, given an relatively fresh engine to begin
with and the usual proper maintenance. The other factor is your treatment
of the car, if you abuse it more now that it has more power of course it
will wear more quickly. The Judson's can't run much more than 6psi anyway -
they are far to fragile.
> -how hard is the installation?
The Judsons typically have their own intake manifold and crank pulley. You
bolt both on, add the extra fan belt and then tune the carb (SU, Holley or
Rochestor) and timing to suit.
> -How hard is the upkeep? Do they break a lot?
Well the Judson requires about 500cc of Marvel Mystery Oil every 400 miles
(especially the the larger displacement Judsons). The Shorrock too requires
an external oiler and periodic refillings.
Judsons will eat vanes... especially when they are out of oil. Both have
known vibration issues resulting in the rotor bearings wearing (remember the
entire rotating assembly inside the supercharger housing is off center and
running at 2000-5000RPM). The vanes scrape against the side of the housing,
and this is what acts as the seal to keep the intake charge between the two
vanes - fairly high friction situation (especially without the Marvel oil!).
> -How much do they cost?
Judsons will cost you close to $2000USD for an entire rebuild kit.
Shorrock's you'll have to get from the UK, and will probably cost you just
as much.
> -what are the sources for kits and spares?
http://www.bcsc.co.uk is the Shorrock source and George Folchi in the US is
your only Judson source for parts and rebuilt kits, (860) 355-2807.
There is a Judson Supercharger list, hosted here on autox.team.net as well.
Often quiet though... Haddon Judson will tease people and say he is thinking
about re-releasing the Judson supercharger, but I doubt it will ever happen.
> I think this will be the last question for a while, simply because I
> have run out of horsepower options to explore
Well I don't think period superchargers are a wise horsepower option,
they're just a "damn, that's really cool" option. For the $1500-$2000
you're going to spend on a PERIOD supercharger, you can more than make up
with it doing other performance things step by step on your motor. The
argument leans in favour of modern superchargers if there were a kit for
your TR4... but there isn't. I think Kas Kastner made a TR4/4A turbo kit
when he left BL (name of the company was Arkay). I know he made TR6 and TR7
kits. GOOD LUCK ever finding one though.
Noah, now stay calm and view this link:
http://www.buildsoft.com.au/tr2
There are some decent period books that give a few pages to both the Judson
and Shorrock units. One is Alan Allard's Turbocharging and Supercharging
(C1981,1983, 1986) and you also have LJK Setright's Turbocharging and
Supercharging for Maximum Power and Torque (C1976). Allard was a
distributor for Shorrock superchargers in the UK (and also the man
responsible for Allard cars)... his book however is not biased towards
Shorrocks. Pat Ganahl's recent book, Street Supercharging (2nd Ed., C1999),
devotes some pages to the Judson. All are relatively cheap books, you can
find the two older ones used for under $15 and the new book for typically
$15 online. And if all this really fascinates you, then you should purchase
Corky Bell's new book Supercharged! (C Nov. 2001), it's $35 though.... $25
at Amazon.
Cheers,
Kai
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