I was at Minis at the Mill today. It was a good turn out. Many of the cars have very large SUs. I was under the impression that all minis in Australia were only fitted with either 1.25in or 1.5in. If this is the case where do the larger SUs come from? Also, what are the sizes of the larger SUs?

1 3/4 Is the big one (1.75 inch) They are 99% as singles, but I have seen twin's but way over done, never needed on a mini except in rediculous situations. I'm getting one soon for the supercharger kit Ben has agreed to make for me once I buy a supercharger. They were never on Aussie mini's but can be found on Rover V8's and a few other british cars. HIF44 is the most techincal one found on carby Rover mini, don't know when they started but yeah... I went today, my car was the union jack mini withe the roll cage (there was two other ones.) Did you take ur car?

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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

1.75" SUs (HS6) were used here on Austin 1800, also Austin Kimberley & Tasman (I think), they also were used on some Volvos.
Later MGBs had twin HS6s.

Performance wise- HIF44 and HS6 are very similar, which is best depends who you talk to.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Austin 1800? Dam I know a guy who's got one rusting in his yard, I'll get them off of him! CHeers Dr Mini!

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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

Just be careful using HS6 SUs - the mini uses an angled manifold and the fuel bowl is straight up and down.

Austin 1800s and other similar cars use a flat manifold (no cross member to clear).

Now when you stick a flack SU carby on a mini, the fuel bowl is angled such that fuel bowl float never shuts off the fuel and you just run raw fuel into the engine.

Its not just a matter of undoing the bolt and twinsting the fuel bowl to the correct position. You need the correct fuel bowl and fittings to begin with. Been there done that !!!!

However, respected performance engineers say that a single 1.75 SU will give performance equal to multiple carb setups with a lot less tuning effort.

There's nothing wrong with a good set-up for twin 13/4
I personally am a sucker when it's comes to a twin set-up instead of the single weber.
They work well and really do look great

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No need to worry, that has already been taken care of. It mounts flat on the supercharger inlet thingo, so It doesn't tilt up or nothing like that. But I'm glad you brought that to my attention as that never crossed my mind. PS single can be qual but never really as efficient according to David Vizard becasue of the siamese ports But single carbies can keep up with twins. At the moment i'm running twin 1.25's and twins look better in my opinion.

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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

HS6's float bowl mounting looks pretty the same as my HS2 Mini one... and I've got a pile of those. Not done this HS6 up yet, it's going on the wife's 1412.
BTW my brother has a Hillman Imp, its carby is my old 850's HS2 with the bowl set at 45*. Works fine... and now back on the road after 23 years in the shed.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Mike B - how is it not just a matter of getting the fuel bowl mounted at the right angle? ( I mean with a proper angle spacer thingy not just twisting it somehow)

here's a 2 incher on mad matt read's 1510 mini



apparently he's working on a twin system...

I suppose all it needed was a proper spacer thingy.

I bought the HS6 off fleabay and as soon as i put it on a mini motor is leaked fuel out the jets and all. I didn't have the right bits for it and it also needed reconditioning so I sold it on.

I went for a HIF44 and that just went straight on and worked.

The point remains that flat manifold SU carbies are differently set up to angle mounted SU carbies and unless they modified they will not work properly.

my morris marina has a hs6 on it

Best part of the car then.... the rest was junk when new!:lol:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Shhhhh! Don't offend him. It wasn't a crap car, just wasn't very good....

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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

haha, its a decent car, very little rust for its age, no saggy doors, comfy seats, powerful motor, rear wheel drive, power assisted disc brakes etc..

i'll strip it for parts, i want that hs6!