13 replies to this topic

[orangeminiguy]

Hi guy's, i was just wondering if anyone could help me, im thinking of fitting weber carbs to my mini but i wasn't sure about what type of weber's i would need or if i would have to re jet them etc, could anybody let me know the correct type?

[Cooperman]

Why do you want to fit a Weber to a 998? Is it for competition use?
You would only fit a single twin-choke Weber and probably a 38DCOE, althout it would need to be revving very high to work well as otherwise the airflow speed through the Weber would be very low with only 998 cc's sucking it in.
A Weber will need proper setting-up on a rolling road to get the jets correct, but once set up will hold its setting well.
To make a Weber work you will also need a good exhaust manifold and a correct size exhaust pipe.
The engine wil need to be able to rev to around 6500 or thereabouts and have a cam and gearing to allow for the necessary revs.
Simple it ain't!

[KernowCooper]

Better off as the info above to do a simple tuning job, Cooper Type Manifold works better on a 998 than a LCB with a good twin/single box exhaust and a single 1 1/5 SU jetted correctly (if you dont have one already) with a performance filter on the intake. Obviously the carb will require setting up and the best way is a rolling road

Anything more will entail taking the head off and stripping the engine and then the costs shoot up

Edited by KernowCooper, 04 January 2013 - 11:11 PM.

[petey81]

there are a few guys on here who have fitted a 28/36 webber

[KernowCooper]

I had a 28/36 on a 998 Cooper and it ran very well and Vizard rates it as a good carb but getting rare nowdays to get a good one

[surfblue63]

Why do you want to fit a Weber to a 998? Is it for competition use?
You would only fit a single twin-choke Weber and probably a 38DCOE, althout it would need to be revving very high to work well as otherwise the airflow speed through the Weber would be very low with only 998 cc's sucking it in.
A Weber will need proper setting-up on a rolling road to get the jets correct, but once set up will hold its setting well.
To make a Weber work you will also need a good exhaust manifold and a correct size exhaust pipe.
The engine wil need to be able to rev to around 6500 or thereabouts and have a cam and gearing to allow for the necessary revs.
Simple it ain't!

Surely fitting smaller chokes into the carb would increase the air velocity for lower revs.

A single 40 DCOE with 30mm chockes would be pretty close to a pair of HS2 SUs in air velocity. You can even get 28mm chokes for the 40 DCOE.

However the DCOE does use a lot more fuel.

28/36 DCD carbs turn up on Ebay and service and rebuild parts are still available.

Edited by surfblue63, 04 January 2013 - 11:58 PM.

[Cooperman]

Why do you want to fit a Weber to a 998? Is it for competition use?
You would only fit a single twin-choke Weber and probably a 38DCOE, althout it would need to be revving very high to work well as otherwise the airflow speed through the Weber would be very low with only 998 cc's sucking it in.
A Weber will need proper setting-up on a rolling road to get the jets correct, but once set up will hold its setting well.
To make a Weber work you will also need a good exhaust manifold and a correct size exhaust pipe.
The engine wil need to be able to rev to around 6500 or thereabouts and have a cam and gearing to allow for the necessary revs.
Simple it ain't!

Surely fitting smaller chokes into the carb would increase the air velocity for lower revs.

A single 40 DCOE with 30mm chockes would be pretty close to a pair of HS2 SUs in air velocity. You can even get 28mm chokes for the 40 DCOE.

However the DCOE does use a lot more fuel.

28/36 DCD carbs turn up on Ebay and service and rebuild parts are still available.

Not a lot of point really when a single HS4 or HIF38, or twin HS2's on a decent inlet manifold perform so well at so little cost. The cost of setting up a Weber on a R-R would probably cost more than a complete twin HS2 fitting and would give no real advantage.

Edited by Cooperman, 05 January 2013 - 12:01 AM.

[JimmyB]

But webers sound so good!

[Bungle]

a webber 28/36 may out perform a su but will a 998 make the most of it ?

[Bungle]

but if the engine is making as much power as it can due to restrictions in cam, head, exhaust etc bolting on a different carb won't make any more power

[MIGLIACARS]

but if the engine is making as much power as it can due to restrictions in cam, head, exhaust etc bolting on a different carb won't make any more power

true true true.
a hif38 is a good car for a 998cc. if the 998cc is modified then a hif44 is more than up to the job.
i dought very much a Webber on a standard 998 will give better power figures than a 38hif.
and these carbs are cheap and readily available. but each to there own.

[jonny95]

what spec is your engine??

if it is fairly standard then there would be little point but if the engine has been modified then it could work well

[orangeminiguy]

im pretty certain my mini has had a stage 1 kit fitted, but thats about it as far as modifications go

[orangeminiguy]

im liking the idea of fitting a hif 38 carb to my mini, looks like quite an easy and cheap swap plus it will hopefully add a bit of grunt to the power, also seeing as my car isnt highly modified