> The fuel pump you recommended uses hose clamps and the outlet
> side is
> short and can only accommodate one clamp, I'm going to see if
> I can
> find some with NPT or AN fittings. Incidently, That $100.00
> pump looks
> exactly like the one in Summit Racing Catolog for $167.00.
> Didn't you get fuel flow readings when you had the 13B on the
> dyno? I
> need a ball park figure for when I flow my needle valve.
Karibian
>
> It is 25 gallons an hour full power and 10 gallons an hour
> cruise.
> I don't see how that needle valve is going to give uniform
> flow in
> all those tubes. I can't see inside of it. Can you make a
sketch?
> --
> Paul Lamar ...No rotor no motor.
>
>
> Karibian,
>
> Good to see you are forging ahead with the mechanical fuel
> injection. It looks like a low-pressure system with no return
> flow. With six injectors you should get good fuel atomization,
> even with
> low pressure.
>
> If this works, it will provide others with a template for a
> simple fuel solution with cockpit mixture adjustment.
>
> Btw, is this an RX8 engine? I thought two of the injectors on the
> RX8 were right on the housings?
>
>
> Regards,
>
> Gordon.
Paul,
You asked me to remind you to dissect the one-way check valve on your
Walbro-type pump to see if it might need a secondary backup check valve.
Scott Gettings
Yes Scott. Thanks for reminding me. Unfortunately I am in LA today
for a trip
to Mazdatrix so I will
be back tonight where the Walbro pump is. As I recall I did not see
a one way
valve in the Walbro pump. But I will double check tonight.
-------------------------------------------------------------------------
Looking at this picture I think I see what is going on. When the
pump motor is
stopped it is a quasi positive displacement pump in that the rotor
is close fitting
in the housing. So fuel finds it hard to flow backwards through the pump
without spinning the motor. I suspect given enough pressure fuel
WOULD flow
backwards spinning the motor. Particularly if the pump is damaged by
running
it dry. In that case the rotor would partially wear away and allow
some fuel to
leak past. This also explains why it does not suck well.
Best to use an external, true one way valve.
The last jpg is the MDS pump I recommend. Sorry about the intake
fitting not being
AN.
-----------------------------------------------------
I just checked and the Walbro's do have a one way ball valve in the
output port.
BTW I just bought a 4 port RX8 motor for the RX8 P-port test engine.
I got a good deal because nobody wants a RX8 4 port rotary engine
in the car world :)
Paul Lamar ...No rotor no motor.
P-porting a 4 port Renesis might be quite a coup...
Matt-
It is the only way to get decent power out of them at 7000 RPM :)
Paul Lamar ...No rotor no motor.
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