Alternative Carbs!

[MotoSook]

So someone thought I should post what I have been working on in the super secret lab. I've been teasing some of the local guys with this for a while. Jamie Novak is working on the ITB for EFI, which was going to be my next stage of development. Kudos to Jamie!

I've contacted the manufacturer/sole US distributor of these, and they will grant me a whole sale account, but I've been so damn busy to work on it. So now you guys know why I have been wanting an engine!

These should be very tunable with the ability to put accelerator pumps on each body (who needs a choke!). Some of you will recognize them right away, but if you don't these are slide valve carbs that will go full open with just a needle in the flow path, minimal obstruction at WOT! I've been working on a mating manifold, but I inverted a stock 911 carb manifold for these pictures so you can see the spacing.

The throttle linkage will be very simple, and I'm working on a packaged regulator set (now you know what was in the head Ronnie) that will work with any fuel system you have so long as the pump can put out enough flow.

Most everything will be existing parts and needles and jets are very available!

Cost? ... you'll like it.....

[thrown_hammer]

intriuging........

[Tim Hancock]

Souk, I was just thinking about the same thing using either Mikunis Kehins or Bings. The only problem I can think of is that it might be a tuning nightmare trying to find the right needle/needlejet/idle jet/main jet/throttle slide cutaway combination. It is bad enough when setting up from scratch with one carb on a dirt bike but times six might be a pain although once the basic setup is found, minor changes would be fun.

[MotoSook]

I was corresponding with a well known FactoryPro tuner about these, and he recommended some jetting that will be a good start. I've got some machining that will come in handy if the jetting is not available off the shelf.

The idea is for me to do the baseline the tuning. Now that I have two 911's, on will be the mobile test bed for tuning. Once I have a baseline, any engine sizes above or below my 3.0 can be fitted with these....within reasonable displacements of course.

[71T Targa]

What kind/size bike are they from?

[MotoSook]

These come in various bore sizes, and ultimately the carbs would be sized and jetted per request.

[jpnovak]

Security Alert! The Secret GrubbeB Labs have a leak!

Cool idea. I was thinking about trying to make a slidevalve system like the factory used. These look like a nice bolt on.

I am still trying to figure out a filter setup. What are the plans for yours? How do you link them together? Cable or rod actuated? Just thinking we could combine ideas here.

Great work!

[MotoSook]

These carbs typically come with push-pull cables, so you can see where it will lead me. The filters can be standard KN oval or cones which ever you'd like. The adapters are available. I've considered an airbox, but it would make it more expensive in the end. I've have a number of bikes with individual cone filters. Most racers run these open with just the venturies.

[Mike Bonkalski]

An option for filters:

NEW UNI CHROME POD KITS



The Chrome Pod Filter features a deluxe chrome end cap, black foam element, black urethane snout and stainless clamp. Not only do they look good, but they perform good! Jetting change is normally necessary to achieve maximum performance. The new series uses a 5/16" wide clamping area to fit all popular carburetors.

(Jetting changes may be required to fully realize the advantages of these filters).

NOTE: EPA law may prohibit stock carb adjustments after 1978 for street use.

PT# Description Qty. Price
PK-22 1 1/4" - 1 1/2" (35 - 38mm) 2 34.95
PK-52 1 5/8" - 1 3/4" (43 - 46mm) 2 34.95
PK-82 1 7/8" - 2 1/16" (50 - 52mm) 2 34.95
PK-92 2 1/8" - 2 1/4" (53 - 55mm) 2 34.95

http://www.unifilter.com/clamp-on.htm

[jpnovak]

I checked that link. I like the black $13 better. Especially since I have to get six. At least they are resuable. Great link. It will be useful in the future.

[KobaltBlau]

Jamie, ITG also makes some "sock" filters that go over individual stacks. I think that would be the easiest. Matt Holcomb's black and red RSRish replica has filters like that on it, he didn't put them on but he might know something about where to get them.

[Carrera3.5L]

Originally posted by KobaltBlau
Jamie, ITG also makes some "sock" filters that go over individual stacks. I think that would be the easiest. Matt Holcomb's black and red RSRish replica has filters like that on it, he didn't put them on but he might know something about where to get them.

One of the ITG importers is Coast Fabrication in Huntington Beach, CA. Phone number is 714.842.2603. Ask for Mike Lang. He should be able to assist you guys or at least point you in the right direction for the ITG filter.

[Shuie]

Nice job Souk!

[slater]

Cost? ... you'll like it.....

About this.. what kind of cost are you thinking? roughly

[jmz]

Souk,

Why reinvent the wheel?

Do you think this will be a less expensive option to used Webers or PMO's?

Don't get me wrong it looks cool.

I was just talking to a guy who races Personal watercrafts about the Mikuni carbs they use and adapting to Porsche. ...we were at a Porsche race shop where they were putting a motec set up on one of this guys PWC race "boats." At any rate, we kind of concluded that it would be too expensive especially using new carbs.

Jay

[MotoSook]

Originally posted by jmz
Souk,

Why reinvent the wheel?

Do you think this will be a less expensive option to used Webers or PMO's?


Jay

These are less expensive than PMO's. I don't think I'm reinventing the wheel. I'm creating an option to add to the short list of available induction choices. Most all the parts are already massed produced, and you can buy them off the shelf! Only the carb body is a single source part.

Some guys will buy a pair of Webers, used and rebuilt, for $1200 or more, then they still have to source other small parts to make it work.

For a total cost that is just over what it would cost to install a set of used Weber, wouldn't you rather have brand new carbs and all the parts you'll need all in one box?

So like the BASF commercials..

I don't make the wheel, I make the wheel BETTER!

[klaucke]

Approximate price?

[unimog]

Originally posted by klaucke
Approximate price?

Originally posted by Souk
Some guys will buy a pair of Webers, used and rebuilt, for $1200 or more,..... For a total cost that is just over what it would cost to install a set of used Weber, wouldn't you rather have brand new carbs and all the parts you'll need all in one box?

My 'guess' in the $1200 range

[slater]

I think anything even close to that range would be an excellent price for a set of new carbs. Plus, you get that "what the?!" from people when you open up your deck lid.

[Randy Webb]

If it was as much of a "turn key" soln as the PMOs and had similar performance, it would kill. If it requires a lot of fiddling, then the market for it will be a lot smaller - but still might be big enough. So I think we should wish him luck.