Latest Sterling Carb development...
 

Carl has just flowed the latest Sterling Carb and we are proud to announce that it flows better than 450 cfm!

YEEEEHAAAAA!

This flow rate is made possible by a new venturi cutting configuration. This flow increase is NOT the result of simply opening the diameter of the venturis further. Opening the venturi diameter increase flow, but decreases velocity.

The primary venturis are opened up from the stock 20 mm diameter to 24 mm.
The secondary venturi dianmeter remains stock, but the contours of all four venturis are reconfigured to achieve optimal flow.

Because the Sterling Carb flows better with the same venturi diameter, the intake velocity is increased.
This provides better fuel delivery potential throughout the entire RPM range.

We feel confident that the Sterling Carb will perform wonderfully on a street port 12a as well as a stock port!

sweet

BTW does this help any bridgeport carbs

im thinking about bridgeing, and i want to get a modded nikki

This model carburetor is not optimal for BPs, but Carl's "Banana Carb" will be. This venturi cutting configuration is so much more efficient that flow velocity will be fine even when the venturis need to be opened further for BR application.

Dude, you guys are cool :).

~T.J.

Hey Sterling, what's the reasoning behind only opening the primaries up and not the secondaries? Or would you have to kill me if you told me? :D

wow, if i wasn't going to go EFI then i'd have to have one...

man I wank a banana carb :P

Sterling is da man! You got me thinking BTW. I got a couple of ideas to get more for your carb and mine. ;)Hopefully the numbers for the banana carb will be availible shortly. Oh and the posted numbers are corrected from a raw data number of 471 CFM.

Dude! No... the jizz is gonna get all crusty in the jets and stuff... I don't think they're gonna wanna rebuild it after that.

Question for anyone... What's the flow rate on a stock carb... As Sterling put it, any piece of shit Nikki from the bottom of a river... I have the number 370 some odd Cubic Feet/Min floating in my head...

I think it is someware around 350 without air cleaner, and under 300 with the stock air cleaner on. One of the biggest mods you can to to improve airflow, is modify your air cleaner to flow more air.

Damn you guys are good. What will the cost be for one of these carbs. Do they come already with the right size jets? I would be looking into one as a cheaper alternative to a Holley.

The stock Nikki flows approx 300 CFM.
Contact Sterling or myself to discuss any of your other questions.

The whole idea is to open up the carb so it flows only as much as the engine can use because any bigger than that, and performance and tunability start to decrease because of a drop in velocity.

Opening up the secondaries simply is not necessary for stockports. But for street port carbs it is because if the primaries are opened up any further than about 24 mm, velocity would drop too far and there would be nothing down low at all. So I was experimenting with how large to open the secondaries to accomidate a streetport.

Carl had been sudying the flow rates of mannis he was working on. We were discussing the counter-intuitive deductive reasoning behind simple manny to engine port matching and how it suprisingly decreases flow rate if not done a certain way.

I knew that we could squeeze a little more flow out of the same diameter venturis, and thus more velocity if the venturi designs were optimized. I knew they were'nt optimal from the factory- I just had no idea how far off they really are!
After researching proper venturi design principals (and a bit of formulae) I started experimenting with different contours of venturi while keeping the diameter the same. I was really just trying to gain back the little bit of velocity we would be losing by opening the secondaries up.

We had no idea the gains would serve us so well! It means that the Sterling Carb is not only better than ever for a stockport, but that it will be quite adequate for a streetport, as well.

Because we have not actually tested the carb on a streetport, I don't want to jump the gun by saying that it will definitely kick all ass for that application. I will say that I am confident that it will. :)
Time will tell.

But the best news for everyone here is that the good old Nikki carb now shows optimum performance promise for every Rx-7 porting configuration, possibly including a 13b bridgeport!

The Sterling Carb's price will not be effected this new development, and in fact, the carb that my signature picture links to is actually the one Carl tested.
-However, a small price increase may be necessary in the spring with the addition of a new step; zinc plating of the linkages. It will cost us in time, materials, and disposal of hazardous chemicals. We will keep the increase as low as we can. (We want to produce the least expensive, ass-kickinest, quality parts we possibly can! ;) )


Please do NOT PM us regarding carburetor sales info. Instead, Email us so we can can send you a copy of everything. There's too much info to fit on the PM board!

Can't wait for the Banana Carb #s!

bring on the banana

That's terrific stuff! My rainy day fund is about 75% there to get one of these bad boys!

Sweet! This means that the old YawPower carb I had is now obsolete....

By the way- those carbs side by side in your sig is wild. The modded carb looks nothing like its' mate..Nice work.

GO STERLING!!!