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Where do you get split webber manifolds in Oz?
https://ausmini.com/forums/viewtopic.php?f=5&t=17016		 Page 1 of 1
Author:  mechanicaly useless [ Thu Mar 09, 2006 6:46 pm ]
Post subject:  Where do you get split webber manifolds in Oz?
Hello folks, Where can I purchase split weber manifolds in Oz?
Ta!
:?:
Author:  feralsprint [ Thu Mar 09, 2006 7:05 pm ]
Post subject: 
Keep your eye out on ebay and all the mini club 4 sales, just a question though are you wanting it just for looks because they don't really have any advantage over a good single weber manifold

Jon
Author:  supercharged 850 [ Fri Mar 10, 2006 12:34 am ]
Post subject: 
Call Steve at Brickworx Racing in Adelaide (8297 9494) sometime next week.

I know he had, and possibly still does have, a set of "R. Longman & co." cast alloy manifolds for split 45's

:wink:
Author:  mechanicaly useless [ Fri Mar 10, 2006 3:49 am ]
Post subject:  Re manifolds
Hi Feral Sprint,
Cosmetics maybe part of it, but I want to try something new (For me anyway) Having had a few minis years ago I am back into the mini scene. I am trying to experiment with maximum laminer flow into a head design. Split weber manifolds give the most direct flow into the intake ports (No small bend to go around) I intend to shorten the manifold and use profiled Stub Stacks to compensate for manifold length. Using webers gives me a vast range of Chokes, emulsion tubes and jets etc etc. I might be barking up the wrong tree, but it will be fun trying. You never know it might work!!!!!!!! If not then it will be back down the single route.
Supercharged 850,
I've heard of Brickworx. I'm at work just now, but I will call when I get back to Oz.
Author:  h0nk [ Fri Mar 10, 2006 7:05 am ]
Post subject: 
I remember reading in Vizards book about how the split webers/dellortos give a more even fuel and air flow into each cylinder because of the lack of curves in the manifold. On paper it seems reasonable, but in practise is there actually much difference/advantage?
Author:  drmini in aust [ Fri Mar 10, 2006 8:56 am ]
Post subject: 
h0nk wrote:
I remember reading in Vizards book about how the split webers/dellortos give a more even fuel and air flow into each cylinder because of the lack of curves in the manifold. On paper it seems reasonable, but in practise is there actually much difference/advantage?

There has been a lot of racing, and single Weber manifold design work done since he wrote that.
Some are getting ~160HP at crank with a single Weber now, and 5 port head- from 1300cc.
No you won't drive it on the street... :lol:
Author:  feralsprint [ Fri Mar 10, 2006 9:14 am ]
Post subject: 
drmini in aust wrote:
h0nk wrote:
I remember reading in Vizards book about how the split webers/dellortos give a more even fuel and air flow into each cylinder because of the lack of curves in the manifold. On paper it seems reasonable, but in practise is there actually much difference/advantage?

There has been a lot of racing, and single Weber manifold design work done since he wrote that.
Some are getting ~160HP at crank with a single Weber now, and 5 port head- from 1300cc.
No you won't drive it on the street... :lol:


Thanks for that doc, I know many engineers have done a lot of work designing new manifolds since Vizard wrote those books and Griegs car is proof of how far things have come since those books were done. I know that even in open sport sedans in the 70s many tried the split weber design but since the mid 80s the fastest 5 ports have used single weber for cost and ease of use and the fact that while it may be reasonable to have a straight manifold for each cylinder it does not really work on a siamese port like a mini
Author:  TheMiniMan [ Sat Mar 11, 2006 1:53 pm ]
Post subject: 
One of the big reasons why they use split webers is the "more even" distribution thing yeah, & also for the fuel bowl not to dry up or starve for fuel on the really big HP engines can suck them dry very quickly (especially if the pump hasn`t the volume/flow to keep up)

but what my old man did years ago was to "angle" the carbs so as to achieve less fuel surge around corners, this also gave him the ability to use a pair of std webers without cutting one of them up

in my opinion that set up is far far superior than the "std" split set up...Problem is tho, you`ll need to make you`re own manifold or modify the "std" split weber manifold flanges. No drama there tho, easy-peasy.

think about it for a sec & you`ll see that there really is no reason to cut up one weber to fit them in there,,,simply angling the carbs to fit them will give the benefit of less surge around hard cornering, (race mini guys will (or rather should) know exactly what i`m talking about...if you don`t then i`d expect that you either have fuel bowl/air corrector extensions allready or you`re not corneing hard enough to notice the problem)

years ago the trick there was to use plastic tube type air corrector "extensions" & a float lit extension to get away from fuel jumping into the air correctors on hard cornering

ah well, just some more trivia for you all to giggle about :-)

& sorry, keeping my splits for a rainy day :-)
Author:  mechanicaly useless [ Sat Mar 11, 2006 2:37 pm ]
Post subject:  Weber splits
Hi Guys,
Sorry for the late reply (work!!!!!!, Interferes with fun) Hmm lots of food for thought here. I've dived a bit deeper into some of the single and split manifolds available on the market. Looking at them, I think I am going to have to make mine from scratch. Seems a shame buying them and then butchering them. I can't seem to find any flow comparisons (Yet) of both single or split manifolds. I guess I will have to do a bit more research. I will however compare both set ups on my motor and inform you all of the results.
I don't think that I will be going so hard as to angle the carbs. My motor is purely for fun driving on the street (Or at 2 in the morning on the twisty back roads!!!!!!!!!!)
Thanks to all for this interesting topic and all of your different inputs.
P.S. Never read D.Vizards book, but will try and get a copy.
M.U.
:?:
Author:  slide [ Mon Mar 13, 2006 10:18 am ]
Post subject: 
I used a split set up on my road Cooper S in the early '70s for a while - in the days when you could buy a new 45 Weber from Norm Beechey Speed Shop in Sydney Rd, Cobug for just over $100 each.

It didn't give any noticeable improvement in performance on the road though it may have done in racing. I eventually went back to a single Weber - more room, less hassle and no discernible drop in performance.

I think you'd be better of inveating in some quality flow work on your cylinder head.
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