[Diy_efi] Liquid Phase Propane Injectors

[Robert Harris]

Pressure in the tank varies according to free air temperature of the tank.
Propane "boils" at ~-44F.  Butane and other lights boil at a higher
temperature.  Temperature and composition establish pressure for a given
temperature. Pressure keeps the everything liquid.  The most insidious part is
that commercial LPG can contain up to 50% or more butane, butene, propene,
ethylene, propylene etc.  A virtual witches stew with no two batches being the
same.  Some advertise 95% propane - but then, so do others sell bridges.

On Wed, 29 May 2002 21:33:44 +0100, you wrote:

>Hi Phil,
>
>Thanks for the info. As I said I am in the information gathering phase at
>the moment. I hadn't realised quite how variable things were on the pressure
>side. Still I have time to explore the options. Certainly seems I will need
>a LOT more inputs into the ECU to monitor things. There must be someone in
>the UK who has done this, I just need to hunt them out.
>
>One extra question though. I assume that the system pressure is directly
>related to the liquid level in the tank and temperature in that it changes
>slowly wrt the otto cycle or are there more insidious mechanisms at work?
>
>Thanks again
>
>Bill
>----- Original Message -----
From: Phil Lamovie <phil at injec.com>
>To: <Diy_efi at diy-efi.org>
>Sent: Wednesday, May 29, 2002 5:30 PM
>Subject: Re: [Diy_efi] Liquid Phase Propane Injectors
>
>
>>
>> Hi Bill,
>>
>> One thing that I should point out is that Liquid Phase
>> LPG injection is an order of magnitude more complex
>> than petrol EFI.
>>
>> This is the short list.
>>
>
>
>
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