Or...What about this? The Mikuni option.
viewtopic.php?f=5&t=83289&hilit=mikuni

and... here's a comparison vid I just made

Short-shifting on the last one as the car is yet to be tuned so I'm not revving the buttocks off it

As mentioned in previous posts, the last vid is not a direct comparison as the head work / cam make a big difference to the sound and performance. How good does it sound though!! hehehehe

http://www.flickr.com/photos/chux007/12337206304/

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1968 Mini-matic - 1340cc, 45 weber - 92hpatw, 14.5 @91mph, GrandmaSpec

Listen to this video and then see if you can guess SU or Weber...
http://www.youtube.com/watch?v=rRNoRlLlsD8

As much I want to say we've it's got to be multiple SUs

Sent from my GT-I9210T using Tapatalk 2

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http://www.rylstoneclassic.com

Wrong.
Next guess?

Over 500hp from 1500cc.

Sounded like a two stage Rolls Royce centrifugal supercharger with twin 3" SUs to me.

Sent from my GT-I9210T using Tapatalk 2

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http://www.rylstoneclassic.com

I wouldn't call it twins, it was a single SU with two chambers.

Would you call a single Weber "twins"?

Most of the comparisons are between a 45mm sidedraft and the S/U's
But how does a 40mm sidedraft compare to the S/U options?
My mini came with a 40 dellorto (not fitted) and I am wondering how it will perform, or if I would be better with a 45?

A 40 Weber or Dellorto is fine on a near stock 1275 but if you are modding it for big numbers (or it's a 1360 or bigger) I'd go the 45DCOE instead. Or a Dellorto DHLA45.

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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.

Road Car SU's every time, Race car maybe Weber

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" A Hundred Years From Now It will not Matter what my Bank Acount Was,
The Sort Of House I Lived in, Or The Kind Of Car I drove ... But The World May Be A Better Place
Because I was Once Important In The Life Of A Child"

Noting that GR "beat" the great Keith Calver (Weber) using SUs

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"Show me the Mini!"

Was a while ago...
But GR's Nb racer runs a 45 Weber, as do most in the class, not SUs.

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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.

my comparison was 2 x 1 1/4 SU's vs a 40 DCOE Weber

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1968 Mini-matic - 1340cc, 45 weber - 92hpatw, 14.5 @91mph, GrandmaSpec

SUs! But only because they look great..

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

I've got a sidedraught Weber 45 on my 1310 Cooper S and HIF 44 SU on my 1360 van. Weber looks and sounds much better (better than many V8s even with Brownriggs and original Lukey style box), is more responsive and reasonably easy to tune and doesn't need any choke when starting from cold. The SU is up to the job but seems a bit more fussy than the Weber. My brother once had a downdraught Weber on his Mini, but that was not as good as an SU.

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Slide
1965 Mini Van (1360)
1970 Mk2 Cooper S (1310)
1978 Rover SD1 V8 (4.6)
1996 Land Rover Discovery V8 (4.0)