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Re: [turbobike] carburation vs fuel injection

John C Williamson (john.williamson5@virgin.net)
Wed, 21 Apr 1999 18:39:52 +0100

Not that this is my argument but..

Fuel injection will make more power (marginally) simply because the fuel is
pumped in.
In a carb the fuel has to be 'sucked in' by the venturi in the carb which by
neccesity has to restrict the airflow through the carb slightly to speed up
the flow through the venturi. If it didn't restrict flow it could not pick
up any fuel!

John Williamson

----- Original Message -----
From: Christer Johansson <christer.johansson@mbox383.swipnet.se>
To: Lorcan Parnell <lorcan@globalnet.co.uk>
Cc: <turbobike@natvideo.com>
Sent: 21 April 1999 16:29
Subject: Re: [turbobike] carburation vs fuel injection

Yes Iīm enjoying this to, but iīm a bit frustrated to see that You
wont accept the facts...hehe
Why didnīt You answer to all my statements in the last mail?
I was talking about modern days bike carbs ,besides fuel injection
has been around equally long.
Well I think I have proven My point over and over again, thereīs not
much more I can do about it...
Not all EFIīs can be adjusted individually.
I just knew You would mention Terry Kizers bike!
But is his bike also a GSXR 1127 with the same turbo setup,
just with EFI instead ? No it aint , You cant compare
apples and peerīs ,now can You?
Please explain to Me  why it is that an EFI will make more power
than a carb setup that works right!
Well I already now the answer to that ,IT WONT.

regards / Christer

Lorcan Parnell skrev:

> Hi Christer, I hope you are enjoying this as much as I am! hehe...
> >To make full use of a EFI setup you would really need to know what You
> doing
> and use all types of sensors, otherwise it will be more primitive than any
> carb
> setup.
> and carbs aren't primitive? Only been around 100 years...
> >I know what a MAP sensor is ,I work with dynoing engines at a engine
> research
> center.
> Then you should have kicked my ass on this discussion by now - I'm an
> amateur!
> >Yes some sofisticated EFIīs can adjust for different flows but then You
> would
> need
> a map sensor in every inlet rubber, on a carb setup the stronger signal
> just pull
> more fuel in that carb, nothing of major concern but nevertheless.
> No, you could just adjust the fueling/ignition on each cylinder against a
> brake dyno.
> >Yes Your van have EFI (to clear emission laws) but a Yamaha R1
> (who makes 150hp/litre) doesent , understand My point?
> Yes, now I do.
> >You may be able to buy an ECU for Ģ650 and injectors for Ģ15 ,but I doubt
> that John Doe can walk into an speed shop and get a nice EFI setup for
> amount.
> I AM that John Doe! No, I didn't walk into a speed shop, i just hunted
> around.
> >Besides you need alot more than ECU and injectors, throttle bodies and a
> box
> full of
> sensors ,wires ,not the cheapest stuff around. The carbs are already on
> bike
> True, but you are coming back to cost, the one point I concede.
> >How fast do I wanna go? well the old setup easily made 200mph and the new
> one
> is more powerful. As I said in an earlier mail Mark Moisan out of texas
> 429hp
> ...and Terry Kizer made 494 on his EFI ZX11...
> Cheers
> Lorcan