17 replies to this topic

[bristolminimad]

right ordered my 1293 engine, but still don't know what carb to go for...... looked at a few webers, and a twin 1 1/2 su's or a 1 3/4 su.... any one give pro's and cons to any of these....

many thanks ryan

[Puddings]

The webbers will give more power at the top end
The twins will have a quick responce (mine do)
Dont know about the single SU

(Wait for some one to tell me i'm wrong :'( )

PS twins look nice

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[Pooky]

I'm having twin su's for my estate, but only because they look good!

I'd go for the webber or HIF44

[Alburglar]

If you want high bhp figures to tell your mates about, then get a weber 45. It will sound good but that's max power at a very short rev range, right at the top of the range, therefore, rarely useable for a road car. If you use an HIF you won't even get near the webers bhp figures, but you do get masses of torque throughout the rev range and a wider spread of power throughout the rev range (where you will actually use it in a road car). Results in a faster car.

I'd recommend the 1 3/4 inch HIF because my car pulls away from some very high spec mini's at lydenn with 110-20bhp with webers. because it's a short twisty track they struggle to reach the high revs and therefore their power.

[Jammy]

I concur with Ali, I swapped my 45 for a HI44, mainly because it was using too much fuel and never found it under powered after the swap, the only thing I really noticed a difference in was my fuel consumption.

[Bungle]

the cooper carbs use a HIF44 and you can get some good power out of them

but twins do look great

[RacingGreen]

have you thought about twin 38's?

[Dog]

Now this thread is interesting.

I have a DOCE45 weber sat here, which I intend to fit to my weekend lane/chav chewing sleeper Mini/Metro.

I knew that they help drink the fuel more then a SU, but would a weber be ok, with the odd trip into town...?

Where I live, I am less than a Minute to open roads, this is where my car will play most of the time, so low gears for higher revs, and more take off power, after consideration, the weber seems to be the favourite over SU's, only due to webers having peak power at the higher revs... am I correct in thinking this?

Sorry to go slightly of track, I do apologies

[supermotolee]

i have twin 38's of an mg and now a propper mini manifold interesting to see how well they work
if at all lol

[RacingGreen]

have twin 38's of an mg and now a propper mini manifold interesting to see how well they work
if at all lol

Why wouldn't they if they are a set?

[supermotolee]

mentioned it earlier and some people had doubts but i rekon they will

[Sprocket]

You might have bulkhead clearance issues. It is the case for a single HIF and that is at the point of the bulkhead where you have as much room as you're gonna get. Now you have two and are spaced apart.

Just something to consider

[bristolminimad]

going for twins, spoke to med and they recomended them, but got a weber in the garage so might put that on and get it jetted for track days.......... thanks every one!

[Jammy]

The other thing to remember about webbers (at least the DCOE) is that they don't have a choke like the SU, so it becomes difficult to start during winter!

[robpeacey]

heres a thought.......

webbers are suppose to be the ones to have, i was always told that a set of su's are just as good if not better WHEN SET UP correctly. also stated bu keith calver on his calver st site. the new thing is to put some bike carbs on it if you can fabricate the manifolds........

the yamaha R1 carbs after rejetting are more than up to powering a 2.2 duratec engine so it'll have no probs with even the beastliest of a series.

the problem arises when the carbs have to be set up. not a job for the underskilled! i know im not up to it, may be playing with it over the summer tho.............