26 replies to this topic

[Guess-Works.com]

Ok, I now have two 45's ready to build a split weber system for my next engine...

Who's done, got, running splits...?

need pics so I can have a look see...

Will probably be making my own custom manifold so what lengths have you used.

[thompy.mark]

See if you can get your hands on a copy of David Vizard's 'How to Modify Your Mini', it has reasonably detailed instructions with some helpful pics.

Good luck

[Guess-Works.com]

that'll be the big yellow book my keyboard sits on

[GraemeC]

Split 45s ! That must be some juice hungry engine you're planning

Manifolds should be easy enough although I'm sure Maniflow produce somthing suitable - at the end of the day its only two tubes with flanges on each end!

[mini_turbo_pete]

i have got a pic of one of my old Mini's with Split 45's but i's the only pic i can find at the mo..

[Guess-Works.com]

Split 45s ! That must be some juice hungry engine you're planning

Manifolds should be easy enough although I'm sure Maniflow produce somthing suitable - at the end of the day its only two tubes with flanges on each end!

Exactly, which is why I thought I'd build my own, no need to pay Maniflow prices for basically two steel tubes with flanges on the end...

Yes I suspect I'll be doing my bit for a fuel shortage, but with a hopeful red line of 8.5-9k going to need something which can shovel the fuel in by the bucket load... and I don't do injection...

[mini_turbo_pete]

You should speak to Nick Swift at swiftune, he recons that a single 48 is better than split 45's and it probably a damm site cheaper...

[wolfys_mini]

pardon me for thinking

but surely, you are using one side of each carb? so is it not better to use both sides of one bigger carb?

and my god what are you doing to want that kind of set up!?

[Guess-Works.com]

The other thought was to run an IDA, but that sticking out the top of my 'supposedly' stock looking van may have been a bt of a giveaway...

[mini_turbo_pete]

hmmm IDA any day, if i hadn't sold my old mini i would have eventually got an IDA for it...

[Guess-Works.com]

Technically there's little difference over running just a single 45, but it's the air flow which is changed, basically the venturi of the carb lines up directly with the port on the head, and does not have the little 'kink' in the inlet manifold... also means you can run a shorter inlet manifold therefore not requiring such a deep box.

[wolfys_mini]

thanks for that gw

i always wondered, i thought it was due to pub bragging rights

or because the works had them

[GraemeC]

IIRC they originally came about from works set ups as they weren't allowed to use twin choke carbs but at the time the Webers were their weapon of choice - answer convert the Webers to single choke and use two!

The straight line flow is a marginal improvement over a std Weber but wether it is enough to warrant the work and cost is a different matter.

[wolfys_mini]

IIRC they originally came about from works set ups as they weren't allowed to use twin choke carbs but at the time the Webers were their weapon of choice - answer convert the Webers to single choke and use two!

yeah thats what i thought, i just couldnt remember properly and didnt want to seem a fool again

gw, i may have a pic on my phone of a couple, i will have a look later for you.

[mk3 Cooper S]

Split 45's are proper thirsty!!

The length of the inlet manifold should be selected for top end or bottom end power/torque or a mixture/compromise for both.
Drag strip or road use?