What Not one single argument Must be loosing my touch

Common Anglix, blast away...Sam nothing to say,Oh man,what a drag

Sorry, I really meant to continue the debate but I've been stupidly busy at work. I've been reading the dialogue, though...

First, just for clarity - you mean multi-point, rather than throttle body injection when you say direct injection, right? This is not to be confused with direct, high pressure injection right into the combustion chamber. Modern Ducatis are multi point, I don't think anyone is doing direct injection yet on a M/C.

If that's the case, then we're pretty much in agreement. I might argue that EFI does have more tuning advantages in that you can tune for a wide variety of input changes other than manifold vacuum, but you could counter that you can do the same with a carb, to some extent. I do think EFI systems are generally less susceptible to change over time, but that's debatable. Carbs *do* get real complicated when you start adding lots of little solenoids and rheostats, etc.

EFI is still more expensive than cheap carbs, but not good ones - if they weren't competitive I can assure you we wouldn't be seeing them on the latest round of MX bikes. I think we're right at the price tipping point now.

I built my own EFI system about 10 years ago, it was a disaster; I lost 2 years of racing pushing my bike around the pits, because I didn't think I had the time to dyno tune it. I got it to work, but never well...the best performance I ever got was when I replaced my EFI with a set of FCRs. Still, eventually I'd like to replace the stock EFI on the 907 with a newer system, when I have the time. Just the controls, I think the stock hardware is perfectly fine. This time I'll schedule a few days on the dyno to get it going right.

Sam

Anyone has some hard facts, like one engine w carbs & injection on a Dyno?
Any motor will do, would be real interesting.

Well said Sam I would agree on every point excepting one. That would be that a single point injector located in the intake has more control over the mixture than a well jetted carb