10 replies to this topic

[miniman5]

Hello jsut wonderign what principle they work on etc and what differance they make n all the caboogle i no how a carb works n that just duno how a weber or wayber what ever they r called works?

[tom]

They are very expensive.

[miniman5]

well thanks Tom...... that realy explain things :tongue: i can see the performance gains much clearer now!

[Dan]

As I understand it, Webers are constant choke, variable depression carburettors (whereas SUs are variable choke, constant depression). The performance comes from them flowing well and being very tuneable by having a vast catalogue of jets and parts for different conditions. I think they run a good number of jets as well which gives them good range. But they are not very efficient. I know that's a boring subject, but they really can drink.

I have been led to believe that there is very little in it regarding performance between Webers and the last generation (HIF/KIF) SU carbs, when they are set up well. The thing with SUs is you really need them set up by someone who truly understands them and there's not many people like that around. SUs are loads and loads more efficient and cleaner regarding emmisions though.

[hammoj28]

Yeah I have heard that SU's are much more economical. I think the power gains are similar betwen webers and SU's but my Dad reckons you can get more power from SU's. I personally love SU's.

[miniman5]

well its only a 1000 i mean wats the MPG on it at the momnat?

[Bluemini]

A well set up HIF is as good as a Weber.

[TimS]

you can get the HIF carbs to flow just as well as the webbers, though the webbers are multi choke, they will run far better in different conditions. there is plenty of info on webbers out there, infact iv got a fiar bit in my 4 stroke tuning book, il have a read 2moz


on a 1000 unless its in silly race spec i dont think it will need a webber

[miniman5]

okie dokie!!! i just wunderd how they were beter than carbs n stuff

[Mini]

Webers (DCOE) are VERY efficient, WHEN the correct qty of air is flowing through them. This is why thay tend to be fitted only to comp Minis, std and fast road cars don't have the air volume movements, especially at low speed.

The SU tends to produce lots of torque, especially in twins, on milder engines. They are a bit easier to set up and don't require bulkhead mods to fit on a Mini. For more modded versions they don't allow sufficient airflow - hence the Weber.

Current price for a 45 DCOE is about £150, add to that the cost of setting it up, a RR sesion is the only reliable way, and a manifold etc.

[Mini]

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