[Diy_efi] Donegan ECU

[Mike]

Mate,
your posts are quite difficult to read as it seems to be missing
the quote prefix and cant easily tell where your comments
start and previous posters finish... Any chance you can
amend your email client ?

regards

mike


At 04:04 PM 1/8/07, you wrote:


>Original Message:
>-----------------
>From: Bernd Felsche bernie at innovative.iinet.net.au
>
>> When you say 'geared to', do you mean mechanically
>> coupled?
>
>Probably not...
>
>> No rules that say the pressure pump can't be close to,
>
>Try the rule of not operating the pump in an environment hotter than
>allowed by its specifications. :-)
>
>It is possible to build pumps that'll tolerate under-bonnet
>temperatures but off-the-shelf ones, designed for under-tank or
>under-body mounting, typically don't.
>
>> or right next to, the fuel rail. In fact, for
>
>Or "in" the fuel rail.
>
>> retrofitting, that can make things easier. That
>> eliminates the 'dead end piping' issue.
>
>Diesel engines have worked like that for ages... especially the ones
>with unit injector pumps.
>
>Heat is more of a problem with gasoline than diesel; especially
>heat-soak. However, the feed pump from the fuel tank can be set up
>to flush the high-pressure pump and rail before starting. There are
>half a dozen ways that I can immediately think of doing that.
>
>There are a few niggly problems about there being enough of a fluid
>pressure damper in the system so that pulsations of fuel pressure
>from the pump and the injectors don't wreak havoc with the fuel
>pressure control system and to ensure a consistent (intended) fuel
>pressure at the injectors. There is sometimes a pressure
>accummulator between the high pressure pump and the injectors, and
>in some systems a separate damper to handly dynamic fluctuations
>(typically when the fuel rail volume isn't "huge" wrt injected
>quantity).
>
>The potential problems from fuel piping (and rail) dynamics are HARDLY
>'niggling'!!
>
>NOR are the needs to pay attention to keeping vapor OUT of the piping and
>rails and for providing adequate NPSH to the high pressure pump under ALL
>possible operating conditions.
>
>Those who do not know the words behind the above 'NPSH' acronym, AND
>_FULLY_ understand their meaning, but who PLAY with the design of such
>systems anyway, quite likely are fully deserving of ALL of the negative
>consequences of doing so --after all, there are even reputable vehicle
>MANUFACTURERS who reaped serious negative consequences from such ignorance
>in the past!!! (Volvo's application of D-jetronic, for instance !!)
>
>Greg
>
>-- 
>/"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
>\ /  ASCII ribbon campaign | "If we let things terrify us,
> X   against HTML mail     |  life will not be worth living."
>/ \  and postings          | Lucius Annaeus Seneca, c. 4BC - 65AD.
>
>
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Regards from


Mike
Perth, Western Australia
VK/VL Commodore Fuse Rail panel that wont warp, twist or melt, guaranteed  !
Twin tyres for most sedans, trikes and motorcycle sidecars
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