Im not familiar with the cogged belt just the v belt on the A series
But a v belt wont be enough if its just a single you need a twin v belt.
A cogged belt (like that on cam belts) can be used but youll also
need a tensioner to save the supercharger in case of a backfire.

Can i juz use the v-belt(cogged belt) frm std A15 a/c pulley and change SC pulley with a/c pump pulley???
Will it grip or it will squeak??
Im thinking to run 5psi with cog belt....

Just looking at these exhaust on this engine made in the 1920s also twin ohc
and beautiful compact head.
http://upload.wikimedia.org/wikipedia ... 38/Napier_Lion_cambox.jpg

I may have had the webber jetted a bit rich. (to protect the engine)
Although on longer journey, (With prolonged cruising) it's not really much worse than a standard A15.
But getting on the go pedal it bores thorugh the juice. It does seem less thirsty with the holley though. But in truth I don't drive it often. Probably about 50/50 street and strip.

here is the vw setup, it was actually 9L/100km


http://forums.aussieveedubbers.com/vi ... id=65678&action=printable

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  blowersc12vw.jpg (121.55 KB)

Youve sold me on the belt, Id get tired of the gilmer belt like noise.
Im surprised the weber did worse without the powervalve as they do have
a similar mechanism in non-progressive carbs eg. dhla, ida/f and dcoe.
Theres a vw with an sc12 with a twin 40mm dcoe that made 10l/100km so
they must be better than the 32/36 for boost?
When you say Blip do you mean flat spot?

I'm happy enough with the holley, apart from it wanting to leak now and again. It doesn't really go any harder than it did with the 32/36, but with the powervalve set up it does use less gas. (Plus I could add a mr gasket scoop) Also it doesn't "blip" like the weber did when the secondary is opened.

U'll still need some form of tensioner even with the toothed belt. And you'd be quite suprised how little noise the blowers themselves actually make. You just get an induction roar, but nothing like the whine of a gilmer belt.

You can use the toothed pulleys from diesel pumps from most utes and vans.
Providing the right size is chosen and most are made of cast iron.
The reason I want toothed belt is they require the least amount of effort
by virtually eliminating tension on the belt.
I know what you mean about noise but superchargers are noisy as hell already.
Bart have you considered running a twin 36 or 40mm downdraft weber from Fiats
or Alfas? or are happy with the Holley now?

heres a pic of the pulley that
can be welded onto a twin pulley vanette one
usually found on the a15 engine

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  zxpump.jpg (35.67 KB)


  amr500.JPG (166.65 KB)

They should downsize once they have all loaded to the page. (At least they do for me)

By a cogged belt, do you mean like a gilmour belt? I don't think they're really warranted with a toyota blower. The multi rib belts are pretty effeicient. I know a bloke from the drags who just runs a multi rib belt on an eaton M112 on his lexus V8. So unless you really want the look and sound of the toothed belt, I don't beleive they're worth the expense/hassle.

Bart you should crop those photos they are massive!!!

Pulleys look great though