[Diy_efi] injector placement question

[Adam Wade]

--- Jack Vines <jackv at ambassadorprograms.org> wrote:

> I saw some test results for all-out race motors with
> a throttle plate and intake stack per cylinder and
> the best injector placement was smack in the
> middle of the air intake stack, firing right down
> the center of the horn.

As was mentioned this gives the best compromise
between wall wetting and vaporization opportunity when
there is a large airflow.

> Seems like quite a fire hazard, having the injector
> firing outside the throttle plate,

Why would it be a fire hazard?  I can't think of any
way that anything could ignite the fuel before
reaching the spark plug when under way.

> Naturally, this was an engine which idled at 4krpm
> and never saw a fully closed throttle bore.

Dual staged injectors makes for one of the best
compromises, assuming you can drive them and have
adequate hysteresis for the shower injector.  You get
a significantly wider dynamic range, and the
advantages of both a runner placement and a shower placement.

=====
| Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
| "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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