..boB wrote:
> Bill wrote:
>
>> Hi ho-
>>
>> Got a few older Hilborn/Crower intakes collecting dust and would like
>> to convert them to EFI. Trying to avoid welding in the injector bungs
>> as the
>> heat causes distortion, which will likely require the intakes to be
>> remachined in order to straighten them out. However- I'm wondering
>> why you can't machine an intermediate adapter to hold the injectors
>> and bolt in place underneath the ram tubes. I'm sure this will work ok
>> at part and full throttle. My concern is that, at idle with the
>> throttle blades closed, the injectors will be positioned above the
>> blades (instead of below them like most setups) so it might not
>> idle so well. On the other hand, tbi's & carbs work that way, and the
>> two Crower
>> mechanical intakes I have also work that way (but I DO realize these
>> weren't
>> meant for cars who's main purpose was idling!). Still, the more I
>> think about
>> it, the more I think it will probably work.
>>
>> Has anyone tried this?
>>
>> cheers,
>> Bill
>>
> Will it work? Yeah, it probably will. But you'll have some idle and
> low rpm performance issues.
I think you might be right but I'm still wondering if anyone has done
this. . .
I think it would be fine for a race car.
> But a street car will have some real annoying derivability issues.
> When the fuel hits the nearly closed blades, it will puddle a drip
off.
That what I thought at first but it doesn't do that with tbi (maybe
because tbi
works with less pressure?). I don't know that it will actually hit. It
might
depend on how far above the blades the injector tip is. And it sprays so
little
at idle that I think the atomized fuel might just find it's way around the
blades (vaccuum) and work ok. Sure the spraying fuel is under a lot of
pressure
but it's also atomized and there is a fair amount of vaccuum at idle.
Maybe the
tip of the injector will have to be some minimum distance above the blades
to
allow for a smooth flow around them.
> Have the bungs welded in below the throttle plates. have a pro do it
> so there's no distortion.
Talked to a couple of pros about this. Depends where you want them welded
and
how thick the metal is there.
It will cost you, but worth it.
> Take a look at how Kinsler does it.
>
I have. And talked to them on the phone. They do it a few different ways:
One,
with Lucas metering (not EFI but makes no diff in this case), bungs
welded into
the ram tubes and sprays fuel down onto the throttle blades. Another (most
common for Kinsler) is below the blades BUT spraying from the outside at
the
opposite side of the intake runner wall instead of toward the valve.
According
to the theory above, the fuel would then splash off the opposite wall and
drip
into the cylinder. But I'm not sure it really does. Yet another (actually
own
one of these) is a 3 piece magnesium intake from a chevy SB (well actually
"Pontiac" but in name only) turbo gtp car. The throttle blades are way
high
(maybe 10 inches high) in the runners with the injectors just below them
on the
inside of each runner- so there is still probably a good 9 inches of wet
flow
before the fuel makes it into the head...(quite a contrast with the direct
****t
injection used on some sprint cars) I called kinsler a few weeks ago and
asked
if this adapter method would work and they said they had done it using a
Hilborn
setup on a hemi and it worked great. But admittedly that was a race car.
I guess there's no way to know without actually trying it. . .
thanks for your input it IS appreciated!!
b
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