Hello all...I am relatively new to the mini ranks...my first car was a 78 MGB which got the british car blood flowing through my veins.

Have just bought a 78 van which is in pretty good nick but would like to give her a little more go. She is fitted with a standard 1100 thats runs strongly and has good compression.

I would like to fit her with the sc12 supercharger that is talked about so much on the forums...is this the best way to extract good power out of the 1100?

What can i bore the 1100 pots out to?

Is it possible to get a manifold that will allow me to fit a Holley Carb on her? or is there a better high performance option?

Will i have to source forged pistons to take the boost put out by the supercharger? Or what else should i do to strengthen the engine to take the forced induction?

So many questions...sorry about this everyone...but would appreciate any advice that is out there

sc-12 kit is a good idea, excellent bang for buck, but sc-12's are hard to come by, and you will need to take your car to a dyno to get it tuned.
estmated cost $1500
you dont have to fit special pistons or anything, if you run low boost it should be okay just so long as your motor is healthy.
i believe the kit runs about 7-8psi standard.
you will need a hif-44 or a hs6 carburettor, preferably a hif-44 to run the supercharger kit.


holleys dont belong on minis, you want a set of twin inch and a quarter SU's or a weber if you're going that route.

OH and welcome to ausmini

I am running the kit.

HS6 is pretty well a no-go. I did manage to fit it, but bonnet NEEDS to be raised or a hole cut in it (might look cool, but probably illegal.... ) also the HS6 was spaced out of the manifold by 3 inchs to clear the clutch cylinder. HIF6 or HIF44 is really the only way. It even says in the fitting instructions "Fit HIF carb to manifold" specifically.

Performance is very noticeable. I wouldn't worry about performance pistons. Lowering the compression ratios is advised. But 8.8/1 which is a standard figure on most Mini motors will hold together, it is only low boost afterall.

Main part is, as said above, the health of the motor. Don't expect it to last long if it's smokey and warn out, and don't expect big hp from that either.

Having said all that, it's worth it, just watch your timing. Don't want too much advance, can blow the motor up. D4R85 Nissan dizzys should be setup to about 5 degrees BTDC at idle. Don't know about Lucas, and this is just a safe figure before tuning.

Cheers, Tim.

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

I would recommend getting your Pulsar dizzy recurved to suit.

Have thought about it. But I've got a chart that shows the Nissan against a Cooper S dizzy, they are equal above 2500 rpm. But the nissan has less advance lower down, so lacks torque. The guy I'm getting it tuned with looked at the advance numbers and stuff for it in a dizzy book he has and said it should work quite well, he also said he's done Nissan dizzy's on mini's before and at least one on a supercharged Mini. Possibly Ben's Mini? -

<edit>Many, many discussions on this topic before here on Ausmini, so to avoid losing track of the thread I'll stop now.

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

im amazed i didnt realize it was possible to suercharge without putting a hole in the firewall could someone make my day and tell me i dont need to pull the engine out to add a charger?? also sozz to be a pain whats all this cost roughly

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Enjoy Chris

Agreed, it's a good match for an N/A Mini, but I think it's better to be on the safe side on a S/C Mini to ensure you don't advance it too much higher up in the rev range (where boost is likely to be high too).

Yeah it's definitely something in my mind. Don't want too much advance especially with the boost and compression and all those things.

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T