20 replies to this topic

[darkcat]

I'm about to convert my SPi to carb, and im looking for either twin 1 1/4 SU's or a weber dcoe 45.

Whats the best choice? advantages / disadvantages of each?

 

Edited by darkcat, 19 May 2013 - 09:16 AM.

[MIGLIACARS]

su any day.

webber 45 on a everyday road car no no.

 

 

hiff 44 is the best carb id say.

[darkcat]

I was thinking twin HS2's actually

I do love the sound of webers....

Edited by darkcat, 19 May 2013 - 09:16 AM.

[minilee94]

Twin 1.1/4 are to small for a 1275 you need twin hs4s really and there is nothing wrong with running a weber on a road car will be just abit juicy but if set up right it will just as juicy as twin carbs .

My mate had a weber 40 on a 1380 and that car accelerated very well

An I know what you mean by the sound that's why il be running a 45

But if you want a weber fit one as loads of people on here will say no it's easier to fit a su and it proberly is but if you want that sound then go for it

[ANON]

instead of going backwards in time and fitting carbs, why not fit throttle bodies??

[darkcat]

instead of going backwards in time and fitting carbs, why not fit throttle bodies??

 

cost.

[mini=love]

SU for ease, Webber for sound. You make the choice.

[MIGLIACARS]

as an everyday road car, webbers are not they way.

they are thirsty, throaty smell and leak, and are hard to start in winter as most dont have the chock connected.

twin 1. 1/4 s are fine on a standard 1275

[coopdog]

Just get a 28/36 weber, best of both worlds

Got one on my 998 and its sounds amazing

[darkcat]

I'm veering towards twin 1 1/2 su's, it looks like id have to recess the bulkhead to fit a weber in anyway.

 

Oh, forgot to mention, im fitting a race/rally cam

[rally1380]

My engine originally had a Weber 45 on it and it returned 9 mpg!!!!

 

Then swapped out to a HIF44 and gave really good fuel economy, good power and easy to set up and maintain....plus you don't loose much engine bay space and can fit within a standard bulkhead.

 

I then swapped out to twin HS4's for doing historic rallying.  You do get better throttle response and better power (even though people will argue that) but the downsides are it is way more thirsty than a HIF44 carb and trickier to setup.  Its not hard to do, its just you do need to have a basic mechanical knowledge and not fists of ham or fingers made of butter.

 

Also, twins HS4's can be expensive!!!!! 

 

Personnally, for every day use on a daily driver....HIF44 all the way. Fit a good filter and you will get the noise you want.

[coopdog]

28/36 is down draft and fits under the bonnet fine if you get the right manifold, it's twin cholk so you can have it kind lean on the first one for mpg then richer on the second for power!!!!!!

[darkcat]

My engine originally had a Weber 45 on it and it returned 9 mpg!!!!

 

RUDDY F**K!!

 

I dont see why a properly jetted carb will use more fuel than another, at the correct fuel/air mixture??!!

My Lotus Esprit ran a pair of Dellorto 45's and returned around 25 mpg.................

[darkcat]

28/36 is down draft and fits under the bonnet fine if you get the right manifold, it's twin cholk so you can have it kind lean on the first one for mpg then richer on the second for power!!!!!!

 I'm not sure it works that way, twin means it has 2 err, holes, one per 2 cylinders in the mini's case. The lower end is manages by the needles, and the high end by the main jets, idle by the idle jets

[coopdog]

28/36 is down draft and fits under the bonnet fine if you get the right manifold, it's twin cholk so you can have it kind lean on the first one for mpg then richer on the second for power!!!!!!

 I'm not sure it works that way, twin means it has 2 err, holes, one per 2 cylinders in the mini's case. The lower end is manages by the needles, and the high end by the main jets, idle by the idle jets

No it does work that way because I have one on my car......

Webers don't have needles....