was browsing the net and came across this website http://khairul120y.blogspot.com/?zx=1b2b05a70fbe359f . Any ideas where you can get your hands on the amr500 or 300? and what do you think would be more suited to a A12 with extractors?

You could try some Japanese importers, the Nissan March's were available with 1 litre engines with supercharging, maybe they are where these blowers come from. I think the engines were the MA9 & the MA10. Those wacky,zany guys stuck all sorts of things on their little engines, like turbos & blowers, sometimes at the same time. Small superchargers like that aren't in much demand, though,so they maybe hard to find. So let your fingers do the walking, as an old sponsor of Mark Webber used to say.

Yes, the AMR 500 is what Nissan MA10 (March Super Turbo) used. But that supercharger is too small for a 1-liter engine, it was only used as the 'primary' and much larger turbosupercharger as the 'secondary'. If I recall correctly the AMR 500 was good for 3000 RPM with the 1-liter.

i know adelaide jap imports can supply them here in south oz so maybe just try a jap wrecker

So to small hey , is there any other blower suited for the a12?

or use two of them...

"Rougue" has one on his datsun. Check out some pics under his profile.

Actually DD,
the AMR500 is an excellent choice for a 1000cc engine, and even larger.
Any 4-stroke engine only displaces half it's advertised volume per revolution.
A 1000cc engine only takes in 500cc each time the crank turns once.
An AMR500, wich is used on several small displacement Japanese cars,
can be overdriven to make excellent boost on a small 4-cylinder.

If it is driven 1.5 times crank speed, it will produce around 7-8 psi on a 1 liter engine.

And they can be driven way faster than that.
We have tested them up to 18,000 rpm.
So if your engine only revs to 9000, the AMR500 cna be driven twices crank speed,
and produce about 15 psi boost.

I have even seen these applied to 1600cc bug engines, driven twice crank speed,
and make around 4 psi.
Nice compact package, that made a good performance gain.

there's the chance that the efficiency of the supercharger is lessened through thermal something. I forgot the word. More fuel would minimize those effects to a degree

Thanks for clarifying. Now I'm wondering why Nissan used an AMR500 *and* a turbo on the Super March.