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Re: [turbobike] carburation vs fuel injection

Bryan Goodwin (bgoodwin@iquest.net)
Sun, 18 Apr 1999 03:34:27 -0500

You make an interesting point, but it lacks scientific information to back it
up.

Lorcan Parnell wrote:

> Christer,
>
> I have to disagree. It is not possible to match the performance of EFI with
> carbs. If it was, the F1 teams would use carbs. Indycars would use carbs.
> They don't.  EFI will always be ahead and as technology improves more so.
> Your point about the variations in flow is simply wrong. Yes, you need 8
> injectors, possibly more (my bike has 16). Bikes of the future will all use
> EFI. The only reasons to use carburettors is because they are cheap, or
> because the rules (like in Pro Stock) don't allow EFI.
>
> Regards
>
> Lorcan
>
> -----Original Message-----
> From: Christer Johansson <christer.johansson@mbox383.swipnet.se>
> To: turbobike@natvideo.com <turbobike@natvideo.com>
> Date: 18 April 1999 16:52
> Subject: Re: [turbobike] carburation vs fuel injection
>
> I thought of going to EFI ,but I saw no reason to do it.
> Efi does have some advantages in that you can map the fuel
> and ignition curves more precisly. But itīs possible with carbs
> and a adjustable ignition module to.
> As long as the engine gets the right A/F ratio there is no advantage
> in EFI powerwise. To know what A/F ratio you have,you will
> need a lambda cell, also a EGT sensor would be nice.
> This goes for both Efi and carb setups.
> During the dial in period I will use a lambda cell and EGT sensors in
> all 4 exhaust pipes and the collector, on the new system.
> Also, blow through carbs could prove more "forgiving" to the design
> of the plenum etc than a EFI would be. If you get sligtly more flow
> through some carbs the injectors on a EFI system will still spray
> the same amount of fuel, on a carb system it will drag the fuel needed.
> Also if you run a high hp EFI system you will need 8 injectors on a
> 4 cylinder engine ,otherwise you could get trouble with idle as the
> injectors would be qite big.
> Carbs gives better fuel atomizing at low engine speeds.
> But a EFI setup looks cooler though....
>
> Christer