[Diy_efi] Siamese intake ports

[Adam Wade]

--- R Talbot <LUSTY1 at sbcglobal.net> wrote:

> I have an engine that I would like to convert to
> fuel injection.  It would more interesting to go
> with individual fuel injectors than throttle bodies.
> I have an 8 cylinder engine which has 4 Siamese
> intake ports. Each Siamese pair is separated by one
> other cylinder firing. I believe that I have read
> injection systems do not work well with Siamese
> ports. If I use one injector per Siamese pair I can
> shoot directly into the intake port.  Does anyone
> have any experience doubling on the firing of
> injectors.

In his excellent book "Engine Management: Optimising
carburettors, fuel injection and ignition systems",
Dave Walker discusses this very issue.

The solution he found to work was to double the
injector firing rate, and halve the amount of fuel
delivered in each pulse.  So instead of the injector
firing every 360 crank degrees, he has it firing every
180, but half as much volume each time.  That keeps
one cylinder from robbing the fuel destined for the
other, in practice, apparently.

=====
| Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
|   http://y42.photos.yahoo.com/bc/espresso_doppio/lst?.dir=/   |
| "It was like an emergency ward after a great catastrophe; it  |
|   didn't matter what race or class the victims belonged to.   |
|  They were all given the same miracle drug, which was coffee. |
|   The catastrophe in this case, of course, was that the sun   |
|     had come up again."                    -Kurt Vonnegut     |

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