Starting a car on LPG directly
Starting a car on LPG directly
(OP)
Hi everybody,
How does the starting the car on LPG, every day, (not on fuel) effect the motor? Does it reduce its life period?
I have a system with 3 positions (Fuel, 0, LPG) and I have a carburetor. My LPG installation guy tells me that I can start my car normally on LPG, but is it good to turn sometimes on Fuel, or just to go along driving every day on LPG.
Thanks
How does the starting the car on LPG, every day, (not on fuel) effect the motor? Does it reduce its life period?
I have a system with 3 positions (Fuel, 0, LPG) and I have a carburetor. My LPG installation guy tells me that I can start my car normally on LPG, but is it good to turn sometimes on Fuel, or just to go along driving every day on LPG.
Thanks





RE: Starting a car on LPG directly
Before unleaded petrol, it was felt that the occasional dose of lead increased engine life, but LPG vs unleaded petrol there is little difference, in fact a dry fuel has a beneficial effect of not washing down the bores on a cold start.
Not using the petrol system will cause degradation of fuel pumps and carburetor diaphragms and seals.
Regards
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RE: Starting a car on LPG directly
This page makes sense, because of the cooling effect in nozles.
I was wondering though, how often do you think someone should run the car on petrol only for the lubricating effects on diaphragms and seals??
RE: Starting a car on LPG directly
Regards
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Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Starting a car on LPG directly
Regards
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Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Starting a car on LPG directly
If you are running only an electric gasoline fuel pump then the same scenario would apply to the wiring/control system.
The main problem with wetting the system is the residue left when a carb is wetted and dries out repeatedly. Modern carb seals and gaskets can be left dry without damage as modern materials are very good (no cork in a quality kit). Think of a newly rebuilt carb sitting on a shelf.
Either you would want to keep it dry or keep it wetted in my opinion, not repeatedly cycle between the two.
RE: Starting a car on LPG directly
RE: Starting a car on LPG directly
RE: Starting a car on LPG directly
RE: Starting a car on LPG directly
Regards
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Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Starting a car on LPG directly
Second, any oils dripping into the air and fuel stream in quantities described are so minute as to be fully consumed during combustion. In larger amounts, No would they add to hydrocarbons in the exhaust and will render a catalyst inoperative in short order.
The oil drip system so touted to help with top end lubrication MAY help intake valves, but they have never had any problem, its the exhaust valves. As so properly stated, since the unleaded engines became so prominent in the mid 70's, the rate of valve problems have have decreased to almost nothing.
If ignition timing is not properly tailored for LPG use, increased exhaust valve temperatures could possibly lead to premature failure, but thats not particularly a problem when everything is properly set up.
I have run many vehicles from first fireup on propane with no problem, many of them are in the mid 150,000 mile range, with one in particular approaching 330,000 miles without a valve cover being pulled.
Franz
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Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Starting a car on LPG directly