[Diy_efi] CIS EFI via Fuel Pump PWM

[Mike]

At 11:39 PM 5/8/2002 +0100, you wrote:
>Erm, how will it take time to build up? Unless a "long" length of rubber
>hose is used, it will be instant.

No - instant is not very likely, what does that mean micro seconds ?

You are forgetting the rotational
inertia of the pump rotor... and the propensity for the fuel pressure
regulator to oscillate during a step change in flow/pressure, most outlets
of high pressure fuel pumps have a damper - mostly for the injectors
but also of value in reducing fuel pressure diaphragm flutter...

rgds

mike




 There might be an issue with dynamic flow,
>but given adequately sized solid tubing I would suggest this would be
>minimal.
>    Huw
>----- Original Message -----
From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
>To: <diy_efi at diy-efi.org>
>Sent: Monday, August 05, 2002 1:44 AM
>Subject: Re: [Diy_efi] CIS EFI via Fuel Pump PWM
>
>
>> ARKK tapped away at the keyboard with:
>>
>> > I asked this a week or two ago. I'm still hoping someone will ut in
>> > their two cents about the viability.
>>
>> > The idea was that CIS injectors could adequately be controlled via
>> > fuel pump modulation for pressure control.
>>
>> Unlikely to be successful unless the pump is quite close to the
>> injector. System delays will be the source of control problems;
>> it'll take a while for the pressure to build up over a couple of
>> metres of fuel line.
>>
>> What will you do to _reduce_ the pressure when load reduces?
>>
>> --
>> /"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
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