Idea: Ultimate carby intake for B series motors.

[BigElCat]

This is just food for thought.

I'm wondering if an EFI intake could be used with Harley Davidson CV carb in place of the thought body. Of course the injector holes would have to be plugged. They use these carbs on 1.3 liter Samurais with great success, they call it a MySide conversion, IIRC. The long runner EFI intakes would be like a tunnel ram manifold, for high lift cams and high rpm use.

[bravekozak]

There isn't a lot of room under the hood. I thought about Weber or Dellorto side draft and down draft carbs, before I installed my twin Mikunis. There are a lot of twin motorcycle carbs, especially on Australian eBay. One of the main reasons for choosing an E5 intake, was a small one inch adapter plate with the water passages almost inline. In other words, it was meant to be a daily driver. This is an older pic of my engine, and I have made a few changes, but look how nice two non-computer controlled carbs fit under the hood with power steering and A/C. I will be finishing my cruise install in the spring.

[BigElCat]

The CV carb would sit in the same position and be about the same size as the original EFI throttle body. It's a single barrel with a cylinder/slot instead of a butterfly IIRC. I'll do some more research about the carb, if people think the EFI plenum would work with an air/fuel mixture instead of just air.

[bravekozak]

Of course it would work. The only thing fuel injection does is have a computer time the squirt of atomized gas directly (as close as possible) into the combustion chamber. Smokey was trying to put a carb or EFI injector as far as possible away, so that the gas could be completely vaporized before entering the combustion chamber.

[BigElCat]

If you have too much plenum, the fuel would seperate from the air, then trickle down the runners. Plus it's not heated. If it could be heated, I bet it it could be used on a more mild motor.

The 2nd Gen EFI intake would be the best, but the ports wouldn't match the B3.

[bravekozak]

It's hot enough under our hoods. There isn't that much space to cool a short plenum like that. A lot of heat is tranferred from the block. I don't think there will be a significant separation, once the B3 has reached operating temp. Can some feel the runners on their FI Festiva and tell us how hot they are? Cool, warm, hot, ouch, eyahhh!

[moz]

Re: Idea: Ultimate carby intake for B series motors.

It's hot enough under our hoods. There isn't that much space to cool a short plenum like that. A lot of heat is tranferred from the block. I don't think there will be a significant separation, once the B3 has reached operating temp. Can some feel the runners on their FI Festiva and tell us how hot they are? Cool, warm, hot, ouch, eyahhh!

Hahaha!!! Is that a Canadian imperial pain scale??

[Festevil3]

I think the CV carb is a good idea I would like to see someone try this, but I am no carby guy either

[BigElCat]

http://www.ebay.com/itm/HARLEY-86-06-EVO-Twin-Cam-XL-Buell-KEIHIN-40mm-CV-carb-very-nice-condition-/181035119736?pt=Motorcycles_Parts_Accessories&hash=item2a2688b478&vxp=mtr

Here's the carb. It uses a normal 40mm butterfly. It common, used on Harleys for 20 years.

What the diameters of the B3 throttle body butterfly, in mms? The B6 throttle body?

Or a Mukini 42mm...http://www.ebay.com/itm/MIKUNI-CARB-...893591&vxp=mtr

[BigElCat]

Here's the one for the Dickmeyer B3. 45mm.

http://www.ebay.com/itm/TM45-2-HSR-45mm-Natural-Carburetor-Only-Harley-Mikuni-/261176530493?pt=Motorcycles_Parts_Accessories&hash=item3ccf55963d&vxp=mtr

Carb would set over the header with a radiator hose back to the B3 EFI manifold. Air cleaner outside the engine compartment, next to the radiator. You'd need a heat shield between the header and carb.

[Christ]

You'd have to use a completely different logic filter and an emotion generator. [Thought body]

[Christ]

Also, carb throat is only one consideration here as well. You'll have to pay attention to max flow rates [CFM] and max fuel delivery as well [jet sizing] as you would with any other carb. Adding a single carb to a 1.3, you're probably looking at a 40-45mm carb throat being sufficient airflow, but then jet sizes - may have to have something custom drilled or use alcohol jets because it's a whole lot of fuel flowing through there.

Plenum itself, won't need to keep it heated... cold idle might be a problem but it'll run fine warm. Adding an extension to the mix, the weight of the atomized fuel may cause it to drop out of the air without sufficient turbulence to keep things mixed... but you've got to keep it under sonic flow speeds, too.

If I were just going to throw something at it as a starting point, I'd probably gut a stock TB and mount a Kei-Hin 38mm or a Mikuni similarly sized to it and go/tune from there.

[deathrace2000]

38 mm Keihin FCR

[BigElCat]

You'd have to use a completely different logic filter and an emotion generator. [Thought body]

Christ! Close the the door. Were you born in a barn? :peach:

They make all kinds of jets for these things. The motorcycle motors have the same displacement, I mean some of them.

[drumnerd33]

I did talk to matt dickmeyer a little about a better intake, he wants to design a really good intake for us carby guys so i told him i will definitely be getting one. I think he is just extremely busy right now. I can see the use of the efi intake but like somebody said earlier what about the hood? My air filter just barely clears the hood by like a 1/4 inch