Starting fuel load question.

[Con Torrisi]

Shannen,

Cold is ambient of about 15-20 Celsius. In my system the cranking value is
regardless of hot or cold, the cold enrich works only when the engine is
cold and begins decaying until it cuts out at about engine temp of 60 deg.

I have high volume injectors and every engine type is different. What would
be useful is know is how much extra fuel is required for cold cranking
compared to (say) hot idle. Then I can work it out. Cold where I live
(Brisbane Australia) is relatively constant and I see that most systems
would have to cope with a much wider variation of temperatures. However, my
system is much simpler and suits my application reasonably well.

Cheers

Con


----- Original Message -----
From: "Shannen Durphey" <shannen at grolen.com>
To: <diy_efi at diy-efi.org>
Sent: Saturday, September 15, 2001 11:14 PM
Subject: Re: Starting fuel load question.


> What temperature is cold?
>
> In many factory calibrations, there are tables with temperature ranges for
this
> job.  I've seen startup pw set well over 10 ms in the lower regions of the
> tables.  Cold enrichment needs to be set correctly for cold operation, not
just
> startup.  Sounds like you don't have many options there.
>
> Shannen
>
> Con Torrisi wrote:
> >
> > Hi guys,
> >
> > I have a question you may be able to help with. My kit efi system allows
me to set a cranking fuel load (in ms) and cold enrichment (as a
percentage). If the normal idle hot injector duration is 1.7ms at idle then
what would be a good duration for cranking.
> >
> > My problem is that the engine is very hard to start cold but starts well
hot. Currently the cranking setting is 4.03ms and cold enrichment is set to
25%.
> >
> > Thanks
> >
> > Con Torrisi.
> >
>
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