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Old 07-21-2013, 12:33 PM   #301 (permalink)
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Join Date: Nov 2011
Location: United States
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Originally Posted by visionary View Post
Hal - thanks for that EFI link. I've just checked out the site and it's just what I was looking for! The pricing looks reasonable too. If anyone has first-hand experience of the system I would like to get an opinion before purchasing.
My aim was always to upgrade the motor to FI when the initial testing is complete. I know I cannot hit my target 100mph without the 11.5hp that I calculated, and the power hike has to come from an engine rebuild with rebore to 100cc and other mods. However, I want to get the project "on the road" asap, so I will leave the engine standard initially. This means finishing the intake port to mount the std carb, even though I plan to junk it later.
Ref the 125 - this is where I should have started, but its too late now! I would be interested if anyone can tell me if the engine mounting points are interchangeable - that would mean less cutting an welding if I decided to upgrade at a later date. Craig(Vetter) always said he thought the 90 was a bit small, so I'm keeping an open mind until I get it running.

Craig - sometimes you really surprise me! I had imagined a "forward thinker" like yourself would be all in favour of EFI. Carbs may be the choice of a racer, but they have no place in modern vehicle technology. At best they are a blunt instrument which hits the target only by throwing-in fuel "and seeing what sticks".
EFI is actually the "racers choice" introduced in F1 in mid 80's long before govts even understood the potential gains. I doubt if any engineer who has installed a good "fully programmable" engine management system, and completed a calibration with the ease and accuracy available, would ever consider going back to carbs.
Your streamliner would probably benefit from EFI - think of all that foreign oil you are wasting!
I'd love to join you on your Vegas trip (Red Rock Casino Sunday 20th Nov - hope you don't mind the plug) but the bike's a long way from finished and I'm still on the wrong side of the pond. But, I'm gonna make myself a promise - I'll do one of your challenges, once I meet my own!
I think the advantages of EFI are it is tune on the fly.Nascar claims a little bit better fuel economy since losing the the big Holleys.A carb is limited to its settings,the average joe is not going to jet for air density,EFI with all its sensors does that for you.Just turn the key and go.Not to say carbs cant work real well,it's just that EFI works better.

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