On a Hot 1275+ why wouldnt you run a 2"SU?

In most cases I think the 2 inch would be too big 1" 3/4 seems to do fine if you want bigger most people go a 45 webber or dellorto

The bigger carb you got the more you lose torque down low

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Roads need more corners
A Deluxe(CG13DE), 2 Clubbies(998 and 1275) and 2 Morris 1100Ss

I would have thought I would lose response due to inertia of the larger parts but Torque? wow why is that?

I'd agree with the torque.. I drove a clubby with an 1100cc engine today.. it had twin 1.5" SUs on it.. it was powerful, but didn't have much torque down low.. My deluxe has twin 1.25" and you can really notice the difference. On corners I could take in 3rd in my car, it would shudder and I'd have to switch down to 2nd in the clubby.. just an example..

Twin HS4s are really too big on an 1100, unless it's a race motor. Twin HS2s suit them great.

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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 used a jag 2"on my blown engine, it worked well, had to upgrade the feul line to 10mm tho

here we go again,
With the SU the piston rises to allow what the engine requires in Air and fuel.
The SU is a fab carb because of this.

"On a Hot 1275+ why wouldnt you run a 2"SU?"
I ran twin 1.75 inch SUs on a street 1330 no worries.

Also I ran a 1275 eater 998 screamer with a 1.75 inch SU again no worries.

The SU is different from like a Weber that forces fuel into an engine with a pump of the pedel.

Mad Matt back me up.

There you have it...

a 2 inch SU on a big bore (just happens to be 1510cc big bore tho)

& i`m building the """twin"""" 2 inch SU set up for it now

HELL YEAHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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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.

i knew mat would pipe up

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hee hee,,,you`re getting to know me well hey cush ???

& i once set up a pair of twin 1&1/4 SUs on a honda zot,,,you know , the little 360cc bike engined things???

well they`re not quite a 2" but it`s the same comparison really on such a small donk,,,& yeah i did have to light weight the carby pistons to get it to respond better & also had a huge time with modifying the dampeners, but then,,,,,well,,,,even i was impressed, you should have seen the look on the face of the customer after he took it for a spin Massive!!!!!!!!!!!

as Ty says,,,they`re a pretty dam versatile carb, & it`s the simplicity of the variable ventury that allows them to be suited so well to anything, big or small, just that you really do have to "Know" what to do when doin something "out of the ordinary" , you can`t just expect to bolt it on & be sweet.

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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.

I agree I love my 1 3/4 on a 1100

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Stop Licking the Dog...I Don't Care Who Started It

spaceboy's mate in SA won (but 'officially' lost on a technicality) hays heroes in a shitter 998 with a 2" SU on it a few years ago

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did I tell you that I won a trophy?