[Diy_efi] injector advance

[Kalmbach, Kevin D]

GianMarco,
How closely related is your Weber Marelli injection to the Marelli Alpha-N
injection on my 1998 Harley?
I'm looking for information on the ECM, particularly how to make a cable to
"talk" to it.  Then to edit. If you know of a good place to start I'd
appreciate the pointer.

Thanks!
Kevin

-----Original Message-----
From: Gianmarco Rizzo (BE/EAS) [mailto:gianmarco.rizzo at ericsson.com]
Sent: August 05, 2004 5:38 AM
To: 'A list for Do-It-Yourself EFI'
Subject: RE: [Diy_efi] injector advance


Hi Bevan

well, a full 4 stroke cycle takes 720 degrees. i take as reference
compression stroke TDC, therefore 450 degrees is 90 degrees before exhaust
phase TDC. considering the somewhat large valve overlap in bike engines,
this should be ok. the inlet valve opens 20 degrees before exhaust TDC and
closes 240 after. the original Weber Marelli ECU injects 600 degrees before
compression TDC

i am using sequential. i didnt write the strategy code but i am in close
connection with the guy who did

ciao

gm

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of Bevan Weiss
Sent: Mittwoch, 4. August 2004 23:53
To: 'A list for Do-It-Yourself EFI'
Subject: RE: [Diy_efi] injector advance



There's only 360degrees in a full revolution.
If you're injecting 450degrees advanced, then you're injecting 120degrees
before the previous ignition event... Which just doesn't make sense.

Injection should really be timed to the closing of the intake valve as
opposed to any ignition event.
You want injection to be stopped once the valve is closed.  So the start
time will depend on how much fuel you need injected and how fast the engine
is reving.

Which injection strategy are you using? Batch or sequential


Bevan


> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org 
> [mailto:diy_efi-bounces at diy-efi.org] On Behalf Of Gianmarco 
> Rizzo (BE/EAS)
> Sent: Thursday, August 05, 2004 2:06 AM
> To: 'A list for Do-It-Yourself EFI'
> Subject: [Diy_efi] injector advance
> 
> 
> Hi all
> 
> anyone with information on what injection advance to use? i 
> am currently injecting 450 degrees prior to combustion TDC.
> 
> is there any relation with fuel evaporating at the contact of 
> the hot inlet valve?
> 
> rgds
> 
> 
> 
> gmr
> _______________________________________________
> diy_efi mailing list
> diy_efi at diy-efi.org
> http://lists.diy-efi.org/mailman/listinfo/diy_efi
> 
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