18 replies to this topic

[Notay]

Hi - I was just wondering if you use a 3.5 inch maniflow manifold for a weber 45 do you still need to cut the bulkhead if ram pipes are used with suitable meshes instead of a kn air filter? As I do not want to go down the IVA test path.

Does the ram pipe clear the bulkhead hole which is already there (and usually covered by the black plastic which leads to behind the dash)?

And finally what sort of performance are people getting on say a 1380 from a shorter manifold bearing in mind the poorer atomisation of the fuel than a longer manifold?

Would be great to see some pics (not many people go for a shorter manifold). I have a 1994 mini sprite.

Many thanks

Notay

[racingbob]

i wouldnt worry about using the shorter one particulary if its for road use
i have a feeling you still have to cut out where it fits in the bulkhead
but maybe someone on here will know for certain

i have used both on a 1380 race car

[mingy]

When i bought my mini 18 months ago it came with a Weber 40 dcoe on a 3.5" janspeed type offset inlet manifold and a big JR (k&n ) filter.
I can tell you all this would not have gone on the head without the bulkhead mods and probably even with ram pipes only you would still have to cut the bulkhead.
My 1380 produced 85bhp at the flywheel on a well worn (virtually knackered block with a bog standard 12G940 head).
I would not use ram pipes with mesh as they will still allow dust and larger particles to be drawn into the engine and very quickly you may well live to regret it, get a good filter or at least some socks.

[Notay]

When i bought my mini 18 months ago it came with a Weber 40 dcoe on a 3.5" janspeed type offset inlet manifold and a big JR (k&n ) filter.
I can tell you all this would not have gone on the head without the bulkhead mods and probably even with ram pipes only you would still have to cut the bulkhead.
My 1380 produced 85bhp at the flywheel on a well worn (virtually knackered block with a bog standard 12G940 head).
I would not use ram pipes with mesh as they will still allow dust and larger particles to be drawn into the engine and very quickly you may well live to regret it, get a good filter or at least some socks.

mingy - do you have any pics of your setup? Is it the weber that hits the bulkhead or the ram pipes on a short manifold which causes the necessary cutting?

85bhp is pretty respectable/good even on a knackered block. Whats sort of economy you getting?

Edited by Notay, 15 January 2012 - 09:11 PM.

[mingy]

This is my Weber 40 setup taken off the head as you see it,sorry it has,nt been on the car for a while as my head is being modded and i plan to run a SU HIF44 on a minispares inlet with an MED stub stack and ITG filter setup.
The Weber was only thirsty when you started to get to 5/6500rpm but it really growls when opened up.
I have put it in the for sale section as i cannot see me using it again and i would think it would be more use on another vehicle as stuck on a shelf!!.
But MPG wise it did,nt seem that bad if you were steady away.

[racingbob]

if i can recall you have to fit a SWAN NECK inlet manifold
to fit the weber in but restricts performance

[Notay]

This is my Weber 40 setup taken off the head as you see it,sorry it has,nt been on the car for a while as my head is being modded and i plan to run a SU HIF44 on a minispares inlet with an MED stub stack and ITG filter setup.
The Weber was only thirsty when you started to get to 5/6500rpm but it really growls when opened up.
I have put it in the for sale section as i cannot see me using it again and i would think it would be more use on another vehicle as stuck on a shelf!!.
But MPG wise it did,nt seem that bad if you were steady away.

cheers - looks pretty sweet. Could you please tell me what the total length is from the manifold to the end of the weber carb before the air filter? Also what is the length of the air filter on its own?

thanks

[mingy]

Hi, Sorry the picture really does not do the inlet manifold justice,the fuel/air mixture path is pretty unrestricted and it was Rob( rolling road) at Minisport who pointed out it was not a dreaded swan kneck type which would crucify the perfomance but it is a Janspeed or a similar design which flows very well( there,s an identical manifold to mine in David Vizards yellow tuning book).
Anyway Notay the depth of the filter is 80mm but there are two Weber ram pipes inside which protrude 16mm past the end of the carb which are the shortest rams for the Weber.I have,nt measured the length of the carb but i will and get back to you asap.

[mingy]

Back with some measurements for you if it will help.

1)length of Weber minus ram pipes = 120mm

2)length of inlet manifold = 90mm

3)Length of filter = 70mm

4) Width of Misab plate = 8mm ( plates fit between carb and manifold acting as flexible joint).

5) Total length of above = 288mm

[MiniFTW]

This is my Weber 40 setup taken off the head as you see it,sorry it has,nt been on the car for a while as my head is being modded and i plan to run a SU HIF44 on a minispares inlet with an MED stub stack and ITG filter setup.
The Weber was only thirsty when you started to get to 5/6500rpm but it really growls when opened up.
I have put it in the for sale section as i cannot see me using it again and i would think it would be more use on another vehicle as stuck on a shelf!!.
But MPG wise it did,nt seem that bad if you were steady away.

Why are you switching over to the HIF44 from a weber?

[Hegnirst]

This is my Weber 40 setup taken off the head as you see it,sorry it has,nt been on the car for a while as my head is being modded and i plan to run a SU HIF44 on a minispares inlet with an MED stub stack and ITG filter setup.
The Weber was only thirsty when you started to get to 5/6500rpm but it really growls when opened up.
I have put it in the for sale section as i cannot see me using it again and i would think it would be more use on another vehicle as stuck on a shelf!!.
But MPG wise it did,nt seem that bad if you were steady away.

do you still have this? as i will buy it from you?? :) old thread for the WIn

LOL

[mingy]

This is my Weber 40 setup taken off the head as you see it,sorry it has,nt been on the car for a while as my head is being modded and i plan to run a SU HIF44 on a minispares inlet with an MED stub stack and ITG filter setup.
The Weber was only thirsty when you started to get to 5/6500rpm but it really growls when opened up.
I have put it in the for sale section as i cannot see me using it again and i would think it would be more use on another vehicle as stuck on a shelf!!.
But MPG wise it did,nt seem that bad if you were steady away.

Why are you switching over to the HIF44 from a weber?

I have got to know a few chaps that rally minis and they have all assured me that the way forward for a mostly roadgoing car is to use a HIF44 as the difference in both carbs performance is small, the weber produces more torque and BHP at a higher rev range but is thirsty, noisier and more complex to set up. The HIF is more economical for road use and only uses one needle which is easier to set up. The only additional part you need for the HIF is a choke cable which is no problem.

[mingy]

This is my Weber 40 setup taken off the head as you see it,sorry it has,nt been on the car for a while as my head is being modded and i plan to run a SU HIF44 on a minispares inlet with an MED stub stack and ITG filter setup.
The Weber was only thirsty when you started to get to 5/6500rpm but it really growls when opened up.
I have put it in the for sale section as i cannot see me using it again and i would think it would be more use on another vehicle as stuck on a shelf!!.
But MPG wise it did,nt seem that bad if you were steady away.

do you still have this? as i will buy it from you?? :) old thread for the WIn

LOL

sorry mate, i sold the weber to another tmf member quite a while ago.

[retrodave]

I ran with the maniflow type inlet with a 45dcoe and it did not require and mods to the bulkhead, it fits in the std aperture, however depending on what filters you use and length of ram pipes, you may have to trim a small area just to prevent it rubbing. I used pipercross socks and 2"-2"1/4 ram stacks. I might have a pic somewhere if it helps.

[WillRunci]

Hi dave ya i would like to see a pic of that please.