20 replies to this topic

[minilee94]

If set right it won't be no more juicy than an su as vizard has said before

And you don't need to recess bulk head you can fit a swan neck or a very short inlet (maniflow sell them as that's what I'm fitting its the best flowing inlet out of all swan necks and short manifolds ad you can fit a filter on with this manifold with out cutting bulkhead )

[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

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

Webers don't have needles....

 

sorry its me being thick, i was thinking twin barrel, which normal webber dcoe's are.

[rally1380]

The thing with weber's is they work best on long straight manifolds. Swan necks do enable the carb to be fitted with standard bulkhead, but are costing you power as the fuel air mix has to negatiate turns before getting into the head.

 

Same can be said for a downdraft. The fuel/air mix goes through the carb and then has to turn 90 degree's in the manifold.

 

This is basic tuning theory and hense why twin su's are better than single's, and why split webers are better still....as the fuel/air mix flows into the head in the smoothest and most efficient manner = more power!

 

Even though i've said that....I think a single HIF44 will still be the best option if for a road car.  If it's for competition use then perhaps another option should be considered.

[The Principal]

You can run a 1275 with a DCOE and can get 25-30mpg no probs, the difficulty running a DCOE is it needs to be part of the overall engine spec. Theres no benefit of strapping a Weber on a standard head the mod's need to compliment each other. If your car is pretty much standard or midly modified go with the SU carb/s. To get a DCOE breathing efficently you need a good 5-6 inch steel inlet manifold plus a good fuel supply etc etc

Edited by The Principal, 19 May 2013 - 03:28 PM.

[darkcat]

This is the car as it sits as of 30 minutes ago, so my options are very open, i intend to do a basic rebuild (rings, main bearings, big ends etc) put in a race/rally cam, and throw a large carb or 2 on. 
I intend to use it mostly as a road car but also want to do hill-climb and the odd track day in it. Im not looking to spend big money or time on it as I have other projects on. 

 

 

[coopdog]

A weber with a 90 degree bend will be just as efficient as a perfect hu, plus sound 10x better!