>> Do you think the Kinsler nozzles would work in the RX8 intake
> manifold
>> injector holes or do they have to be in the main air stream?
Karibian
>>
>>
>> I think they have to be in the air stream.
>>
>> Paul Lamar ...No rotor no motor.
>
> Perhaps an e-mail or call to them would be beneficial.
> They have been very good at problem solving for our
> race engines, without a sales pitch. Every system sent
> to them for rework and calibration, has come back so
> well set up that we hardly turned a screw upon installing.
> Archie
>
>
> Karibian,
>
> I would suggest downloading the catalog and looking at the various
> nozzles shapes and sizes they offer. If you can find a shape and
> size similar to the EFI nozzle on the RX8 engine, I don't see why it
> should not work.
>
> The key thing is that it should spray fuel into the runner the same
> way the stock nozzle does -- not spray it onto the runner wall
> because it's too short or whatever.
>
> The other thing is how you will thread it in. It may not be the same
> size hole or thread. If the existing hole is smaller you may be able
> to enlarge it and rethread it so the Kinsler nozzle will fit.
>
> Regards,
>
> Gordon.
>
Gordon,
If the nozzle is constantly spraying then at low idling speeds some
fuel is
getting sucked out with the exhaust during over lap. I can imagine
that at
higher speeds this is not happening perhaps as much if at all. What
do you
think the BSFC will be compared to EFI in light of the fact Mazda
choose the
later in Lemans. They were concerned to get the best BSFC since it is an
endurance race. Mistral and Tracy both say that timing of the
injection is
critical for good BSFC.
In either case I want the injector right on the housings so maybe
this isn't
an issue. I am trying to design a way I could test both systems
using the
same injector boss.
Doug
Doug,
Mounting the injector right on the housing sounds like a good idea.
It will maximize the evaporative cooling effect of the fuel on the
air charge. I guess you will attach the bosses to the p-port tubes
that go in the housing?
About the BSFC, off the top of my head I don't see why the constant
flow nozzles should be at a disadvantage. Maybe at idle, like you
say but how much time do you spend at idle?
I could be wrong. Maybe the rotary has some peculiarities that could
make timed injection better. But at a steady rpm and power output I
don't see any advantages with timed injection.
If we think about the flow in the intake manifold, it is pulsed not
steady, coinciding with the rhythm of the intake cycle. So the flow
coming out of the nozzle will be pulsed also, becasue the air
flowing across the nozzle pulls the fuel through the nozzle. As the
air mass flowing across the nozzle slows down, the flow from the
nozzle will slow down. As it accelerates, the flow from the nozzle
will accelerate.
So even though fuel is flowing constantly, the amount of fuel flow
coming out of the nozzle will vary with the pressure pulses in the
manifold.
Of course only testing will give you the real answer.
Regards,
Gordon.
Doug,
I found a needle valve that should work nicely. It is made by
Swagelok and smallest size is 1/8 NPT which should be good. Orifice
size is 0.08".
it uses a toggle handle to pull the needle out and open the valve,
but we can toss that handle and attach a cable right to the needle.
As you pull the cable the needle comes out and flow increases. This
is perfect because increasing the flow on the return line makes the
mixture leaner.
So pulling the calbe makes the mixture leaner, just as it should be.
If you have a nice Vernier cable, you can make very fine adjustments.
Regards,
Gordon.
Regards,
Gordon.
Interesting idea.
The only problem I see Gordon is it does not have a long needle.
Hard to tune with something that moves only a fraction of an
inch from full off to full open even with a vernier.
Paul Lamar ...No rotor no motor.
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