Injector timing

[Greg Hermann]

At 10:14 AM 3/14/02, Axel Rietschin wrote:
>----- Original Message -----
>From: "Rausch, Bernd" <br at rnt.de>
>To: <diy_efi at diy-efi.org>
>Sent: Tuesday, March 12, 2002 16:35
>Subject: Injector timing
>
>
>> What about using big injectors and injecting only when the intake valve is
>open ? With opening times of about 230deg, you need big injectors with low
>duty cycles of 720deg/230deg, about 30% at WOT.
>
>It actually helps the torque a little to deliberately inject on a closed
>valve at mid rpm range. With huge injectors you may get big droplets that
>don't really evaporate well, so you'll run lean with a lot of unburnt fuel,
>so you will increase to fuel to run normally rich (for max power) and you'll
>end up with a whole lot of unburnt fuel, very poor emissions and very poor
>economy. This was the main reasons why I switched to paired injectors of a
>smaller size (2x bosch 400 per cylinder instead of 1x 403 - I plan to use
>the even smaller bosch 803 in the near future as I have too much headroom
>with the 400's). For best power and economy I believe a good approach is to
>use a high fuel pressure and the smallest injectors with enough flow for the
>application.
>
>--Axel

In order to do what Bernd is talking about, air boosting of the injectors
(and the consequent very fine atomization of he fuel)  is necessary. And
YES, done right, it will help things if timed as he described.

Greg


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