Alright call me crazy but I think I want to step up to quad hs2 carbs on a 7 port head, what I want to know if roughly how much power a single hs2 carb can supply? Also do you know anyone that has run this setup on a 7port a series head

Currently I'm getting 42kw atw on twin hs2 carbs. But that's at 4900rpm and I have a bigish cam so I'm thinking it should may be running out of breath.

Also I'm sure someone is going to tell me to just go twin webbers, but what is so much better about webbers than su's?

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i like it loud

Small bore or big bore engine?

I'd go with the twin web's or dellortos or be really cool and get a set of r1 quads... the hs2's wouldn't be worth the effort in my minds eye when there are so many other options available

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Here am I sitting in my tin can far above the Moon
Planet Earth is blue and there's nothing I can do...



“A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.” - Jeremy Clarkson

If it`s one of those cheap 7-port heads from the states then i`d seriously look at fixing up the ports & valves & their seats etc before i did anything

you will get way more than 42kw`s just doing that

even before you start talking decent carbs

but if it were me then i`d inject it too... after you fix the head that is

edit--> Oh & to help maybe answer your question about the quad carbs idea ,,, maybe quad HIF38s would be better,,, there`s probably not enough room to fit all four HS2`s in there with all the float bowls in the way,,, maybe face up/ dummy-up a set & see first yeah???

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

The ability to select separate idle, air and fuel jets as opposed to a single needle that has everything, for one

As per above, is this a 998, 1098 or 1275? if the former then 75ish hp at the flywheel (30% running gear loss) is not bad already in my book. If 1275 or bugger then yeah look at valves and ports as Matt says. What exhaust are you running? ID

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Lillee - 1969 Morris Mini K

errrm...the humble SU has far more adjustment available to it than a side draft. The problem is just finding somebody who knows how to do it. There are clubs, and knives, but more people know how to shape a club than sharpen knives.....

Tuning SUs on a modified motor, you are never sure if the 1 of 700+ ? needles you have is the right one. If you can't find the `right one' then you need a `needle sharpener', aka a file- and someone who knows how to use it. There are not many of these gurus about.

I like my `Innovate' A/F ratio meter and Dellorto jet selection.

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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.

I say go for the Quads. I rekon they would look cool as and NO ONE else would have the balls to give it a go. The easier option of twin webers is less fuss.
I look forward to seeing what option you take and how much effort for HP is required. Even if the gains are not as high as the webers HOW many others wil you see with the same set up and unless your racing it why would the maximum HP make a difference. When people see the quads I'm sure they will stand and ogle for hours

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If its got tits or wheels its gonna cost you

1973 Solid side Leyland Mini Panelvan 1100 in Hairy Lime(Elma)
1976 Clubby project in progress
1966 Morris Mini Deluxe in need of a full resto
1971 Mini K Garden Art

a bit more information, im currently running a slightly worked 1310 on a 5port head. im looking to do this around feb next year, so dont hold your breath waiting for results. quad hs2's just seems like an orgasm to my inner car maniac.

im currently running about a 9.0 compression ratio and a 1 3/4" exhaust. but with the new head ill be wanting to port out the exhaust and run a ~11.0 compression ratio. i want to get about 75kw at the wheels before going crazy in a few years with the 16v KAD kit and a supercharger too

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i like it loud

Well seeing as the head is off it talk to some good tuners about the ports and valves, you mose well get that part sorted and out of the way.
Is it in a round or square nose mini?

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Respect mine and I'll respect yours.

Bah, Ive been planning on putting quad electric HS2s on a 7port but now Ill just have to find something else. Its obviously more show than go but I think it would look cool

Yeah yeah I know, I'm just being pedantic. I agree completely that because of the knowledge and tools around us it is likely a sidedraft may be a more practical option for a modified or oddball engine, I'm just saying it's not correct to imply that the SU is in someway restricted in it's tuning abilities. By it's very design it's more tunable...in theory

"By it's very design it's more tunable...in theory..."...

I guess all the serious racers use Webers (if they have to use carbs) .. because they're more concerned with results than theory????

Cheers, Ian

Yeah, seeing as they are so interested in fine adjustments from idle right up through all part throttle and load situations, rather than only being interested in WOT. (I figure answer sarcasm with sarcasm )

Put r1 carbs on it, they're basically a modern version of an s.u and they aren't as tall, I reckon s.u's would stick out the top of the bonnet pretty badly