Re: Injector Duty cycle calculations

["Bruce Plecan" <nacelp@bright.net>]

> Oh.. this is not on my truck... this is race engines..

Ya, I got that.

> My truck was horrible from idle too 3000 where the cam started to work
> My bsfc were around .475 from 3000 till 4000 then they started to climb..
> and go goofy.. bounce around..

What for fuel metering were you using on the dyno?.  EFI, Holley, SU,
Carter, TBI, Webers, <g> etc?
Grumpy

> Mike Rolica
> Plant A,
> Magnesium Products Division
> Strathroy
>
> (519)-245-4040  Ext. 244
>
>
>
> -----Original Message-----
> From: Bruce Plecan [SMTP:nacelp@bright.net]
> Sent: Monday, July 24, 2000 12:17 PM
> To: gmecm@diy-efi.org
> Subject: Re: Injector Duty cycle calculations
>
>
>
>
> > and how wide of range did it run, a
> > band of a couple hundred rpm or several thousand?.
> > Usually 5500 to 7500
>
> Uhmm, this was with the 165??
>
> > Yes and can change in less than an hour... seen where engine was
> > running  .39.. then set valve lash..
> > Had storm fron coming in.. next pull it ran .45's.....john playe
> > with carb.. got it back down to .40~.41...
>
> Weather and a relash, and stuff changed that much?. That is toooo
> cutting
> edge by a long run for a street motor, and that rate, you could melt
> a motor
> by carrying a passenger, and pulling a long grade.
>
> > I agree... seem they have problems with exaust valves:-)... run
> > really hot...
>
> Lean is watching the greenish sparks in the exhuast, and just
> knowing that's
> the exhuast valves leaving thru the ports (short primary pipes
> usually
> needed to see this).  Say a ----  one time dump sparks thru the
> mufflers
> once.  Hehehe, I won, he had a miss afterwards.
> Grumpy
>
>
>
>
>
>
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