17 replies to this topic

[blake12345]

Hey,

I was wondering if anyone could give me some insight into whether a 40mm Weber of a 1100cc Race Car from Japan would work on a fairly modified 1098cc that will driven pretty much every day? The 1098 has had a 80 thou bore a worked head a RE13 cam (from Australia) flat top piston and yeh a few other bits and pieces.


Thanks Blake

[CobraV8]

It will get the car going, may be fine, but for maximum power and drivability it will need to be tuned on a dyno. I have one of these on a fairly mild 998 - and is good to drive.

[blake12345]

ok yeh i was going to get it tuned properly but i just wasnt sure if it would be good or not. I currently am running a 1.5" SU which needs a rebuild and i can get the weber and manifold for the price of a rebuild (well close to anyway) so i was tossing up between the 2.

[bmcecosse]

My view - you would do better to use an HIF44 on an MG Metro inlet. Far easier to set up - and will use less fuel -but if determined to use the 40 weber, fit the largest chokes you can get in there.

[blake12345]

Im not really determined to use the weber im just looking at my options. Im not really sure on what is best in terms of carbys and the like. BUt yeh im just wanting to see what other opinions are.

Thankyou Blake

[bmcecosse]

To fit the weber - you will need to weld in a 'weber box'.
And - wear ear protectors!

Edited by bmcecosse, 13 December 2009 - 10:29 AM.

[cap'n crunch]

My view - you would do better to use an HIF44 on an MG Metro inlet. Far easier to set up - and will use less fuel -but if determined to use the 40 weber, fit the largest chokes you can get in there.

I would have to say the Weber is easier to set up as once they are set up that is it they are done, an SU will need tweeking and drifts in and out of tune. Yes the SU probably will give you a bit MPG but not by a whole lot. For choke size check the Vizard bible for a rough idea and talk to some weber specialists.

To fit the weber - you will need to weld in a 'weber box'.
And - wear ear protectors!

Once again you do not HAVE to fit a weber box, depends on the manifold and air filter length that you use.

ear protectors? then you will miss out on the great sound of the weber!

[blake12345]

Well im happy to get it setup properly and get what needs doing to it done to get the best out of it. But yeh i dont really want to be cutting my firewall to put a box in so if i can fit it without the box than i still dont know what to but if i have to put a box then i think i'll stick with the 1.5"

[CobraV8]

I have a short manifold and no air cleaner just short trumpets, but... a thin air cleaner would fit. You do not have to have an airbox or cut the firewall with a short manifold. Fuel consumption is good. Sound is noiser than SUs but has better throttle response and goes well. I agree with the statement about once tuned - never have to touch it.

[Asphalt]

What about an airbox with a hose leading to a cone filter?



Those are sold as part of a tuning kit, consisting of a 40 Weber, LCB & alloy manifold (short, 2.5" IIRC), air hose and K&N filter. It is recomended to raise the compresion by skimming the head in the instructions. Apparently those kits are good for ~50HP.

[WiredbyWilson]

To fit the weber - you will need to weld in a 'weber box'.
And - wear ear protectors!

Once again I have to disagree.

My old 1275 didn't have a weber box and returned good mpg, and to be honest isn't that noisy unless you have lead boots!! Although with my 1330 i have fitted the box and the only problem was having to re-locate my HU which used to be in my dash.

May i ask bmc if you have driven a mini running a weber?? As if you had the noise alone would convert you to wanting one!!

Go for the weber, good solid reliable carb once set up

Edited by Wilson1330, 14 December 2009 - 09:06 AM.

[Equinox1275]

What about an airbox with a hose leading to a cone filter?



Those are sold as part of a tuning kit, consisting of a 40 Weber, LCB & alloy manifold (short, 2.5" IIRC), air hose and K&N filter. It is recomended to raise the compresion by skimming the head in the instructions. Apparently those kits are good for ~50HP.

Man that kit is beautiful. I need it in my life!!! please reply because i really want to know where you found this and what it is. Looks stunning

[Equinox1275]

bump

[Bungle]

3 year old topic i'm not sure he's even here any more

[Artful Dodger]

Some bad press around here... Fit a weber normally means a weber box. The only manifold you can run without one is a swan neck. And they are very poor, it's like downgrading to a lesser SU. there is no point!

Another angle to look at it is using one choke from a weber 45. There is less silly furling due to there only being one pump jet in action and it would perform well enough for your engine. All of the old 100bhp miglia 1000cc engines used one!