Idea: Ultimate carby intake for B series motors.

[BigElCat]

Hold up...the slider carbs might not work...the butterfly stays open via the cable, but the slide opens with an vacuum draw from an opening intake valve(?) A common plenum would not allow the slides to open at all. Nuts!

Comments?

Constant Vacuum slide carb operation

http://www.bikerenews.com/Stories_Archives/Carburetors.html

Yeah, it would work. You might have to divide the plenum with a wall between cylinders 2 and 3.

[drumnerd33]

dont su's have a butterfly... ive heard that the su is a great carb

[Movin]

You sir are dangerous!! That could work, make them slightly uphill to the middle on the new plenum to further discourage puddling, dang
that could be really nasty..dual carb bike cables..Sock foam filters..the music from under the hood would be awesome!!

[BigElCat]

You sir are dangerous!! That could work, make them slightly uphill to the middle on the new plenum to further discourage puddling, dang
that could be really nasty..dual carb bike cables..Sock foam filters..the music from under the hood would be awesome!!

Go back, I editted it.

[BigElCat]

001.jpg

Like this.

What size and type of carbs? I want the cheap ones, with a piston slide and butterfly.

Oh yeah, I need a B3 EFI intake too.

[Movin]

I like the cable pull mukuni's no diaphragm to tune or slow things down.
Round slide is cheaper, flat slide is a little more compact. no butterfly.

http://www.ebay.com/itm/2002-ski-doo-summit-800-twin-mikuni-carburetors-carb-carbs-02-01-ski-doo-/181087721409?pt=Snowmobile_Parts_Accessories&hash=item2a29ab57c1&vxp=mtr

[moz]

Idea: Ultimate carby intake for B series motors.

[ATTACH=CONFIG]11746[/ATTACH]

Like this.

What size and type of carbs? I want the cheap ones, with a piston slide and butterfly.

Oh yeah, I need a B3 EFI intake too.

The only other thing that you must take into account is that the b series inlet manifold has back fall before it enters the head. You will have some serious pooling if you run fuel through it.
Only options IMO would be to cut it at the flange or use an early jdm manifold.

[Christ]

They'd work even if hte manifold wasn't divided. They just work on vacuum, not some special magic. Divided or not, the same amount of vacuum [sort of] is present in all parts of a manifold.

If you wanted to use a bank of bike carbs, you could remove either plenum and just cut the flange off, take a round tube and swage it to fit the port cutout in the flange, and use a rubber coupler to attach the bank of carbs. You may even just be able to use the flange as an adapter plate and bolt OEM carb boots right to the flange using short machine screws or allen head socket caps.

Most bike carbs in the CV-style will fit behind the engine in the same config as they are on a bike [no manifold or runner extension], but youre gona take a serious hit to low-end torque.

[BigElCat]

You're taking us farther away from the goal...'Christ'. Thanks for the disinformation.

My dual carbs are the solution, but a double plenum is required due to harmonics of the pulses. firing order

A quad would be better, but they won't fit.

[fastivaca]

A quad would be better, but they won't fit.

Four itb's on a BP.... check out this thread

[sketchman]

You're taking us farther away from the goal...'Christ'. Thanks for the disinformation.

My dual carbs are the solution, but a double plenum is required due to harmonics of the pulses. firing order

A quad would be better, but they won't fit.

Dude, WTFishsticks are you talking about?
The link you posted even disagrees with what you just wrote.

Here, let's make it easy enough for a caveman.
CV carb, common plenum, dead simple, bolt-on.
Now, 2,000 words.



I would start by copying what this guy did, but imagine it flipped so the bend goes either toward the cam gear or the trans just to get it off the valve cover. Then just see how well it works. THEN, start getting fancy, IF you HAVE to. You could even leave the injectors installed to further simplify the testing phase.

Just try the simple way first.

[BigElCat]

Excellent pics of the Suzuki Samurai "MySide" conversion.

I may try this on my stock B3. The tube would have to be twice that long, though.

The multi-carb set ups we're discussing are something to get a hot B3...like the Dickmeyer...up over 130 whp.

What link disagrees? Stay calm, "Christ" can rep himself if he feels the need.

[sketchman]

I'm calm. Sorry if it came across any other way than goofing about. I thought it was obvious with the WTFishsticks thrown in there.
You're just over-thinking it. You don't "need" to worry about harmonics or what the intake valves are doing, and it'll work with a common plenum and 1 CV just fine. I would personally go with a CV rather than a user operated slide carb if I were to pick one. The CV will be more consistent and more accurate. With a cable slide carb, the operator can throw the A/F ratio all over the place at any RPM.

[Christ]

First part of that post was because you mentioned using a divided intake, which isn't necessary even with a carb on both sides of a regular EFI intake manifold. The rest of it was just additional information you didn't need to include, but sorta fits.

I measured it out awhile ago - 4 bike carbs will fit between the engine and firewall, but it's really tight and you can't get much for a filter back there. No part of it was disinformation, it just wasn't as relevant to the post as you 'apparently' wanted it to be.