Lectrons and power jets

[Alice Bowie]

Has anyone ever tried to test and see at precisely what point (in rpm or CFM) that the powerjet becomes functional I am aware it might be different according to engine size, camshaft size and timing, port design, carb size ect


Even a rough rpm range would be good to know, if the information is somewhat accurate.

[Tim Rinkerman]

It depends on vacuum..(load). Adjust the screw out and it will start dumping fuel right off idle....close it..leaning it...to keep it from coming on till the top end..it all depends on where you need it....

[Alice Bowie]

Thanks Tim,


But my powerjets dont have an adjustment screw. Just a mikuni pilot jet screwed into the orifice under a cap screw. I know changing the jet size gives me a leaner or richer mixture, just didnt have anyidea about what point the vaccuum was enough to start drawing the fuel through the jet.

[Tim Rinkerman]

Gotcha...I have a 44 Lectron with one of those and a screw needle type...mine is on a turbo, I can rev it up and watch the fuel go through the clear tubes up to the jets....I set the needle to allow fuel to pass at about 2/3 throttle, to start off with...

[RicN]

You can adjust the pickup point by using longer or shorter tubes. IIRC shorter tubes work higher up the rev range.

[Kawi1500Vortex2]

u sure about that


i kinda doubt it...its just a 1/8" hole perpendicular to air flow which creates a vacuum and pulls the fuel up to the jet


trons are not really a carb


i believe they start off rich, get right at about 10k, and then start to lean out from there


that is why paul added the pj


where are you shifting your motor


wheres it at going across the stripe

[PM720]

Uh, why don't you call FBG I think they would have a general idea how these carbs work. [img]smileys/smiley5.gif[/img][img]smileys/smiley2.gif[/img]


Scott

[Kawi1500Vortex2]

are you sure


i mean, after all,you guys dont have a clue how your ignition systems work


haha


gotcha

[RicN]

Tank, I believe it's right. Something to do with where the outlet is sitting in the airstream and different velocities of air across the venturi.


Can't say I 've ever tried tuning em like that though, always just do rod and jets.


AFAIK the powerjets have always been there, like when they were originally used on TZ's. My old 38's are genuine Lectron and have them.

[Kawi1500Vortex2]

guess its possible


they are right behind the radius


pretty much...


sounds more to me like someone was bored and had ran outta things to try


lol