[Diy_efi] sequential injection timing

[Carl Hardie]

Hi Kent,

I am by no means an expert on this one, but the explanation that I heard,
was that the centre of the injection pulse should be slightly advanced on
the maximum inlet port velocity.
This is done in an attempt to get good atomisation (??? not sure if this is
the right word to use), or distribution in the chamber.

I am sure there are otherways to work out when to inject.

Please feel free to correct me.

Carl.

----- Original Message -----
From: "Kent Martin" <kentmartin at froggy.com.au>
To: <diy_efi at diy-efi.org>
Sent: Sunday, July 28, 2002 2:32 PM
Subject: [Diy_efi] sequential injection timing


> Does any one know at what angle you should start fuel injection
> in a sequential injection arrangement. I would have assumed
> that you would start injection just before or when the intake begins
> opening. I had a look on my car and found that they started injection
> somewhere around 70 or 80 degrees before TDC. The valve is not
> open at this time, why do they do it then?
> This was measured at idle, and they might have been timing it so at
> maximum load the injection finished when the valve was closing at the
> expense of spraying on a closed valve at lower loads. Does anyone
> have an explanation for this? What are the advantages and disadvantages
> of different injection start times?
> Kent.
>
>
>
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