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Q.
Can I fit a Judson Supercharger to my 1500/1600cc VW engine?
A. The Judson was originally designed to be used with the 36 and 40hp VW motors but will also fit the later 1300 unit. Will it fit a
1500/1600? Yes the Judson Type2 (single belt) will fit the 1500/1600 as the engine casing is the same as the 1300. It will give extra performance but the unit has to be
"overdriven" (ie turned faster by using a smaller blower pulley) to produce this required performance.
On the 1600 engine the stock 34pict carb will not fit the Judson so the 30pict (standard on
the 1500) has to be used in its place. You will also need to replace the
1600dp manifold with one from a 1300dp. You will also have to fit a larger main carburettor jet.
Having said that you should realise there is a downside to
"overdriving" the unit and that is extra heat is generated.
Bearing this in mind we can't recommend fitting a VW Judson model to the
1600dp engine as it requires to be "overdriven" just that bit
more. In a warm climate you will very soon be overheating your engine.
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Q. I have just bought an incomplete Judson
supercharger, is there anywhere I can find the missing components?
A. Yes, you have two options open to you. You
can advertise for the missing parts here on our Buy & Sell page or you can contact one
of the repairer / restorers found on the same Buy & Sell page.
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Q.
I have a kit with a few missing parts and I think I can make them. Is
there anywhere I can find engineers drawings with the exact measurements?
A. I'm afraid official blueprints of the
original components were destroyed in a company fire in the early '90s when
a large amount of documentation was lost. We do have restorers who can
supply you with missing parts but it would be unrealistic to ask them to
supply specifications of specific parts. Your best bet is to find somebody
who lives near you who has a full kit and ask to take measurements from
that. How would you find them? Register with us, you might find someone who
lives within easy reach.
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Q. Is there an alternative to Marvel Mystery
Oil as it is hard to find in this part of the world?
A. Yes, in fact you'll find on Judson's own
fitting instructions they don't actually name Marvel Oil as the recommended lubricant.
Marvel Oil is an upper cylinder lubricant
that has been chlorinated...meaning that the oil has "creep and penetration". If you use a replacement for Marvel you
must ensure it has the "creep and penetration"
characteristics specific to an upper cylinder lubricant. This is
necessary to lubricate the end bearings
in the supercharger, the vanes, cylinder walls and valve stems.. You'll find that
some single
grade 10W motor oil will fit the bill. You can buy them at motorcycle dealers and if
you live in the U.K. Morris Oils make a 10W that is said to be identical to Marvel Oil in
all but colour, ask for "Morris ring-free XHD 10W". If in doubt
stick to Marvel, it's worth paying the extra to protect your Judson and
your flat four engine. You'll find Karmann Konnection in the U.K. hold a
ready supply, BBT in Belgium and the U.S. virtually everywhere.
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Q. I'm
told that supercharging a 30/36hp Beetle will quickly ruin the crankshaft and
main bearings, is this true?
A. No. Although the 30/36hp crankshaft has a
reputation of being comparatively fragile the extra stresses placed on it are minimal. If
you keep within the recommended rev limits and change up at the normal points the 30hp
will take it in it's stride. If you do hang on to 2nd and 3rd a bit longer it will do no
damage. If you keep the engine singing rather than howling you'll find reliability
unimpaired and a good deal more fun to drive.
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Q. What spark plug should I use with my Judson?
A. Judson recommend a slightly
cooler plug,
(Champion L-10 or L-7) than the standard Bosch W7. Try the Bosch W8AC (VW van spec).
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