[Diy_efi] And for the bottom end of the market....

[Joe Lutz]

I'm at UNC Charlotte.  We used an F2 for several reasons.  The main reason 
is that it is what we already had at the school.  Second reason that we used 
the F2 vs say an F4i is that the F2 is less oversquare...bore is smaller and 
stroke is longer.  Smaller bore gives us a faster burn so we get a higher 
mep for the same mass of traped mixture.  Also the longer stroke  increases 
in cyl turbulence at the same rpm for faster flame propogation.  Honda 
decreased the stroke on the F4 to give it the 15500 redline.  With the 
restriced setup required by the rules, we didn't need to turn 15k.  The F4i 
is far better than the F2 for an unrestricted application, but not for FSAE.

Joe

From: "peterw" <peterw at waybeat.com.au>
>Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
>Subject: Re: [Diy_efi] And for the bottom end of the market....
>Date: Mon, 16 Jun 2003 18:47:28 +1000
>
> > I just finished a Formula SAE car project in which we used a Motec M4 
>ecu
>to
> > control a custom pfi setup and two coil wasted spark ignition on a Honda
>CBR
> > 600 F2.  The engine was mapped n-alpha with the map sensor used for baro
>
>Which Uni are you at Joe ?
>
>I wish I was still doing engineering so I could do the SAE car thing.
>Wollongong Uni(my hometown Uni. Small town near Sydney in the land of Oz)
>did very well in this years SAE competition.
>
>What's the deal with wasted spark ignitions. Do they do that only because
>its simpler. i.e don't have to worry what stroke you're on.
>
>And why not just pick a FI 600cc bike motor and use as is ? Is it because
>the standard 600cc bike FI is not very good ?
>
>Peter
>
>
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