lpg convertor

[kenre]

I have searched here to no avail, as i know it was poted here once before. Impco LPG convertors have an arrow for orientation, what is the reason for this? i want to fit one and the neatest way is unfortunatly arrow down.

Ken

 

[franzh]

Impco vaporizers have no directional orientation on any I have. The reason any of them may say to point down is to allow any heavy ends (grease like substance) to flow into the vapor stream.

When Propane is heated, the propane vapor becomes the lightest compound and is pulled into the engine as fuel. Any heavier compounds with a higher boiling point may settle in the vaporizer. These are usually C16 and heavier, some paraffins, some polyesthers, some amine compounds, etc. Some of these products are left in during the refining process, some are leached from pumps and compressors, some are leached from hoses.

Franz



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[kenre]

Thanks for the reply franzh.
the one i have is a Model L, and a small arrow with "top" cast next to it. This does place the vapour outlet towards the bottom. Is it best to fit it to the engine itself, or to the bodywork? engine is a V8.

Ken

 

[franzh]

This basic question is out of topic for this forum, but to change it into an engineering point:

You should keep the amount of fuel in transit as close to the engine as possible. This minimizes the chance of backfires and improves throttle response. If the system is closed loop, it will improve on the fuel transit delay time too.

Franz

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[kenre]

Point taken! reason i ask is are they affected by vibration at all?
Is it possible for uwanted vibration to upset fuel vapour delivery, being that there is only very low vacuum acting on the diaphram?

Setup is not closed loop, but certainly may change to that if parts needed can be found.

Ken

 

[franzh]

Generally speaking, any regulator can be affected by vibration, it just depends on how much. In an automotive application, I would not worry about it.

The vacuum may be low but it is consistent and the diaphragm is relativey stable.

On some zero governor units, the regulator must be mounted inline with the vehicle centerline to avoid diaphram shift during braking or acceleration.

Franz

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