24 replies to this topic

[1293sleeper]

Hi
i want to fit a weber to my mini i have a highly tuned 1293 should be about the 100bhp mark with a longman race head 286 kent cam fully lightend and ballanced big end and mega jolt plus a lot more.

the question is which of the dcoes should i use and what is the best manifold to use concidering i don't want to cut the bulk head/put in a weber box i know this won't give me the best power results but it is my choice, what lengh is a swan neck manifold and are there alternative short manifolds

[Dave33]

If you run a swan neck the whole point of fitting the weber is being knocked on the head.
They are very inefficient,you also need rampipes on webers so there wont be much room for these and a decent filter arrangement.
If you dont want to make a bulkhead box,dont bother fitting it,whats the point if it results in less performance than a standard su setup?
dave

[mini-geek]

go for twin HS4s

[miniobsessed]

If you don't want to mod the bulkhead but still want decent performance I vote for a HIF44 on a good manifold with a good air filter. Then get it setup at a competent rolling road.

Should also make a few extra ft/lbs of torque over the Weber too

[1293sleeper]

The powerloss of a swan neck is always greatly exagerated I have seen cars using both swan necks n mediom lengh manifolds doing almost the same on rolling roads and better than hiff44s of the same spec. All I was asking was what lengh is the swan neck as I was looking at shortest manifold on mini spares but didn't want toi order it if I had to cut the bulk head.

[valve bounce]

i know your can get 2 inch, 4 inch and 6inch manifold if that helps

[Dave 1293]

why fit a weber... just guna cost more to run and not gain anything from it.

[1293sleeper]

I like the sound they do give performance increase conmpaired to single su if set up properly and I have a dcoe40 without a manifold and don't have a pair of hs4s or hs6s

Oh yeah and the hiff44 is only really good for 100bhp and my long term aim is 120bhp

Edited by 1293sleeper, 20 June 2010 - 05:42 PM.

[Dave 1293]

only if you fit it with a straight inlet, mine was a 6" mini spares one, with trumpets and 100mm k&n filter the power gain was 74bhp with su to 79bhp... ok it was bit more responsive but also a pig in the cold, pig in the hot, hated gettin stuck in traffic, would over fuel or glaze over. Took it off after 8 months. can get the same from a su setup correctly.

[1293sleeper]

Twins maybe but u won't get much over 100bhp on a hiff44 no mater what the engine spec where as a dcoe can be used on engines up to 130bhp maybe more. Twin hs4s are peaking at 110bhp so a weber or twin hs6s are my best choice.

[Dave 1293]

well if u do go weber do it the right way and not a swan neck.

[1293sleeper]

What I really want is twin hs64 there is a set on ebay

[Pending]

Cut the bulk head and stick some nice split's under the bonnet

[Dave33]

the hif44 is good for alot more than 100hp,where did you get that idea?
The vizard book shows a 1435 fully worked motor putting out around 117hp with a hs6 su,that flows less than a hif44.with the weber on a decent 5" manifold it was about 121 hp.,the su gave more power than the weber up to 5000rpm,and was only 4hp down at 7000rpm.
on a comparison on another 1400 motor,there was only about 1hp between the hif and weber 45 on a good manifold.
hif44 flows 240cfm,unmodified
weber 45 flows 242cfm,unmodified.
a test vizard did with different manifolds on a 40dcoe,show a 5hp loss at top end between a swanneck and a 5" manifold.
The torque curve was was the worst of the lot,a hs4 completely outperformed it.
so if your not bothered about performance,fit a swanneck.
seeing as you have made mods to the engine to improve performance,this seems a bit crazy.
The 40dcoe on a good manifold is really only good for 80hp,similar to a single hs4,if you want 120hp you need a 45 or a hiff44.
hth
dave

Edited by Dave33, 20 June 2010 - 09:55 PM.

[satvinder]

ive got a webber in the garage going on my migular 1293 lump. its got a swan neck as i also dont want to cut the bulkhead. the engine ran amasing with it on and had around 120bhp.
ill get some pitcures an measurements for you mate
ill try do it tomorrow for you, pm me you email address so i can try send some pictures over

sat

AS SAID HIS CHOICE TO RUN THE SWAN NECK MANIFOLD. IF YOU HAVNT GOT INFO DONT ANSWER!!! HE WANTS A SWAN NECK MANIFOLD NOT PEOPLE TELLING HIM NOT TO RUN ONE!