[Diy_efi] RE: Diy_efi Digest, Vol 1, Issue 506

[efi student]

I thought the concept was rather like a diesel.  Relatively high =
pressure,
fuel introduced as near the time of ignition as possible to reduce the
opportunity to detonate.  I would expect that time to be long after the
intake valve has closed.  Am I not understanding something about GDI?

Lance

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] =
On
Behalf Of Mike
Sent: Saturday, January 11, 2003 9:50 PM
To: List for general do-it-yourself EFI talk
Subject: Re: [Diy_efi] RE: Diy_efi Digest, Vol 1, Issue 506


surely you'd need much bigger injectors as your spray time per engine =
cycle
is less, or will you raise pressure or also spray a little when the =
inlet
valve is closed ?

rgds

mike



At 05:35 PM 1/11/03 EST, you wrote:
>well im no EE but ive been working on a AVR based injector controller=20
>that
>takes a ecm pulse and converts it into a sqeautnaily timmed pulse. im a
long=20
>way away form having it built. but it can be done. and alot of CDI =
engine=20
>desiels and the mitsu stuff are in fact rail controlled fuel pressue. =
but
its=20
>more in the head return. the point of CDI isnt to spray fuel directly=20
>into
>the cylinder. its to take advantage of the vaporazation from the heat =
of
the=20
>chamber/and being able to time the fuel to stave off detonation with =
hgih=20
>compresion ratios. a hot injector pintle will really help to atomize =
the=20
>fuel. this will inturn make it easier to ignite of very lean mixtures. =
yet=20
>again any GM ecm could be use with a bit of hardware development. then
again=20
>for all the trouble it might actually be easier to just scratch build=20
>something or use a design similar to the efi332 project.=20
>
>  its all subjective. there alot of way to skin the cat.
>
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>
>

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