ESE's works engine tuner

[Frits Overmars]

Remove around 3mm of material in the side of the duct outside of the reed cage - this helps flow from the petals that exits sideways from the cage (not directly out the tips).

Here are a couple of pics that may clarify your point, Wob.

[wobbly]

Thanks Frits.
This spillover flow out the sides is very apparent when using the style of stuffer as is used in KZ engines.
I discovered this when velocity testing the flow of the SKUSA CR125 reed cage.
As the carb is offset upwards and also angled to the side there is a huge amount of extra flow on the right side petal exits.
There is a higher velocity out sideways than directly in line.
I adjusted the petal backup stiffeners to even out the differences, and picked up over 2 Hp thru nearly the whole powerband.
The only other comment I would have is that a big taper out into the transfer ducts as is shown in the RH pic does not seem to work.
Keeping the area in front of the reed box as small as is possible ( by reducing especially the vertical height ) seems to be better.
I think that making a real effort to fill in the roof and floor, then making extra area to the sides, to help the angled reed cage flow would be the go.
But in KZ we cant add material.

[crbbt]

do you want me to send over my reed block for the RS wob

[F5 Dave]

Jeez Louise some of this stuff is not intuitive.

[jbiplane]

Attachment 333175Attachment 333172Attachment 333173Attachment 333174Attachment 333176Attachment 333177

Hi Greg. Just wonder what DOS-software generates pictures of flows in cylinder? Is it realistic enough?

[Greg85]

Hi Greg. Just wonder what DOS-software generates pictures of flows in cylinder? Is it realistic enough?

hello, yes DOS software but the version I do not know there are several versions for the bench jaros? you know this type of bench?

[Greg85]

Remove around 3mm of material in the side of the duct outside of the reed cage - this helps flow from the petals that exits sideways from the cage ( not directly out the tips).

wobbly thanks for your analysis i will do it, as you said the inlet design for a 30mm carburetor is super important to have a good flow and look for the 50 HP but complicated to reach ...

[Greg85]

Here are a couple of pics that may clarify your point, Wob.

Thanks frits for your explanation

[Flettner]

Ok, anyone here know anything real about the smart carb?
Have been told by a convert that the SC will atomize fuel better than a modern fuel injector. I don't believe it but someone here will have the 'real dirt' on these carburetors.

[husaberg]

Ok, anyone here know anything real about the smart carb?
Have been told by a convert that the SC will atomize fuel better than a modern fuel injector. I don't believe it but someone here will have the 'real dirt' on these carburetors.

its a lectron Ei, Quicksiver, posifuel, lake injector, rehash.

[Flettner]

American company? Excellent marketing then.

[husaberg]

American company? Excellent marketing then.

1968-1969: The Lake Injector prototype and final production model carburetor.
· 1970-1971: The Pos-A-Fuel prototype and final production model carburetor.
· 1971: The Pos-A-Fuel with remote float bowl production model carburetor.
· 1973-1974: The Lectron prototype and final production model carburetor.
· 1976-1977: The E.I. Prototype and final production model carburetor.
· 1978: The Blue Magnum production model carburetor.
· 1980: The Bank of Four Blue Magnum model carburetor.
· 1981-1982: The Qwik Silver prototype and production model carburetor.
· 1982: The Qwik Silver Bank of Four carburetor wins Daytona super-bike race.
· 1993: The Qwik Silver II production model carburetor (sold to Edelbrock).
Wob was doing something with one a while back 4 years or so.

https://www.kiwibiker.co.nz/forums/s...post1130842057
https://www.kiwibiker.co.nz/forums/s...post1130255542
https://www.kiwibiker.co.nz/forums/s...post1130812466
https://www.kiwibiker.co.nz/forums/s...post1130437168
there is more but KB search is not working properly maybe due to the thread being split a few times. poll etc

[wobbly]

The Smartcarb does a few things really well, but they would not listen to me re the shortcomings.
The flat cutaway needle from the Lectron is used, and yes it does atomize fuel smaller than conventional FI.
This makes the carb much less tuning sensitive.
The bore is egg shaped at the slide, giving very good throttle response at small openings.
And it has a pressure sensing setup in the top of the bell mouth ,that varies the depression above the fuel in the bowl.
This has the ability to correct the fueling on the run when it encounters differing air pressure.
Works really well at Pikes Peak with a huge variation in elevation.
And they has won several classes of Quads with engines/pipes I have done.
But its big downfall is that unlike a Lectron it does not have a secondary main jet circuit ( power jet ) than can be fine tuned to alter the top end jetting.
This means its all but impossible to correctly jet a twin to get equal egt, as just like a Lectron moving the needle up and down doesnt affect the main jet fueling.
They dont make needles in fine enough increments to change the egt say 30* F,and thats a real hassle even in a single cylinder application.

[Flettner]

And sonic flow engines? Part of smart carb I believe?
Oil less engines if I read it correctly?

[Frits Overmars]

American company? Excellent marketing then.

Yes, the kind of bragging that never fails to irritate me. However, I must say the Smartcarb performed really well on the dyno. But it gave some problems on the track,
whereupon its patent holder made an appointment to come over to Europe, insisting to meet me in person. He was scheduled to arrive early October. Still waiting...