flat slide throttle motorcycle carbs on car engines

[Warpspeed]

No I am not bagging anyone out. I just do not wish to see someone spend a heap of money and time on something that will never run as well, or be as an easy to get going properly, as an EFI system.

Sure carbies work o/k for drag racing, no argument there. Even constant flow mechanical fuel injection is good enough for that.

But the advantage of the Forum is that you can ask the opinions of a lot of people with far more experience in a particular area than you might have yourself.

Now somebody might want to fit carbies just for the look and the sound, and do not really care about how it actually runs. Fair enough I suppose.

I once fitted tripple DCOE webers to a six cylinder engine, and had hell trying to tune it properly. I am just trying to save people some grief that is all.

A multi throttle body EFI system will look and sound just as good, be easier to tune, have far better drivability, and over a long period probably end up cheaper as well.

No I am not bagging carbies, but these days there is far better technology available.

[Rota_Motor]

I dunno about the other guys, but if I priced up all the parts etc. needed for the carb setup, and it cam even close to an EFI setup costing.
the EFI would get the nod.

but I like the old carbs so I cna do the caveman 'needs fuel, bigger jets' thing

[mondo2000]

Rota_Motor:

Yep I agree a good heatshield will fix the heating problem.

With the primary/secondary ports thing, I was thinking if you have the same size carbies on all ports, the primaries would be bulk rich. Which may lead to excessive wall wetting and poor atomization. This usually isn't a problem with injection. Don't know if it would be a problem with carbies either, I've never seen a setup such as this.

[Zac]

Rota_Motor, did you include EFI tuning in your estimation of turboing costs? I guess you are lucky in that EFI gear is readily available for your engine. For mine for example, factory EFI manifolds are extremely rare!

Warpspeed, sorry for the little outburst, I just get frustrated with people telling me to go to efi all the time.. I will, just not yet!

[floody]

Originally posted by jasondale
Modern Lectrons or FBG's are the carby of choice for most drag bike racers, easily adjusted, they are awesome for power!! Problem is cost 48mm's would be ideal though.

But everyone else uses keihins or mikunis in performance appliations where some variety of throttle openings are to be experienced. Maybe there is a reason why you don't see lectrons on thumpernats bikes, supermotards or road racers? I haven't seen a lectron flatslide on anything newer than a '74 CR250m elsinore (except in drag applications of course)...NOt saying anything is neccessarily wrong with them but maybe the beaten path is the best. Kawasaki zx-7r's are the last superbike racebikes on carbs, and still make as much or more power than the injected ones.....why? KEIHIN!!
Keihin 41mm seem ok, our one supported 65+ hp on a 650cc kawasaki klx, should be plenty big enough for decent power on a l-series with cylinder volumes in the region of 400-500cc, and lower revs. It was a pumper type carby for better response too.
cheers,
floody

[jasondale]

lectrons are not suitable for anything other than full open, full closed applications, the modern fbg's are nothing like the old lectrons, other than sharing the name

[hemi770]

I see your point Warpspeed, this isn't really the right thread for it though. I have no desire to replace perfectly functional carburetion with electronics.

[Warpspeed]

Hey guys, Im not trying to have a go at anyone over this, genuinly sorry if I have come across sounding a bit noxious to anyone.

Cheers, Warp.

[doctor ed]

give me the flooding smell of a WOT to slammed shut tipple weber asembly ANY DAY....


hhhhoooooooooooooorrrrrrrrrrrrrrrrrrrrrrkkk....... ..
hhhhoooooooooooooorrrrrrrrrrrrrrrrrrrrrrkkk....... ..
hhhhoooooooooooooorrrrrrrrrrrrrrrrrrrrrrkkk....... ..




love that sound

screw efi (if only it didnt do such a good job)

ed