LP conversion

Anyone on the board ever convert an updraft tractor gas carb to LP? I know you have to use a on demand vacuum regulator. I've seen some done years ago but don't remember the carb details as to where they injected the LP. I'll be using vapor only for this application.

Changing from gas to LP would involve changing cylinder head to get higher compression. Would be short on hp going from gas to LP without a compression increase.

You dont need to increase compression to burn LP back in the 50s when it came available many tractor were converted to LP where i live the local LP dealer bought a small shop and had people busy converting to LP and they didnt change heads

(quoted from post at 20:56:10 04/05/16) Changing from gas to LP would involve changing cylinder head to get higher compression. Would be short on hp going from gas to LP without a compression increase.

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I think what I see being said/// Is The BTU Rating.
L.P. Gas has less BTU than gasoline, Per Unit.(Less Energy).
It takes more L.P. gas to do the same work as gasoline.
The same as it goes, Highest to lowest, J.P.4, Diesel, Kerosene,
Gasoline, Liquid propane, Butane, Natural Gas.
Highest BTU Per Unit to the Lowest BTU unit.
As above, increasing the compression will make it more efficient,
And more H.P. power! I Agree! Does it need to done. No. You will loose H.P. Though! Again a lower BTU fuel.
Updraft Carb. No problem!! They have used these for years and still do in my industry. Forklifts,Refer/ units. Gen/Sets,Etc.
Just set it up right for the load and Idle and you should be fine.
As I said Both posts are CORRECT in what they Are saying!!
Just set it up right and you'll have no problems.
Just remember L.P.GAS is heavier than air and settles in low places!! Natural Gas is lighter than air and raises.

lp has more hp and needs different intake values Im thinking burns hotter.

or exhaust values one is different cant remember whick ones

(quoted from post at 11:36:05 04/06/16) or exhaust values one is different cant remember whick ones

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Not as much of a concern with engines built for unleaded fuel.

In the late 70's my uncle converted a chevy pickup and a ford pickup to propane and drove them many miles, also converted a JD combine (i think a 6600) to propane and never changed a head on any of them. Bob

(quoted from post at 14:32:05 04/06/16) In the late 70's my uncle converted a chevy pickup and a ford pickup to propane and drove them many miles, also converted a JD combine (i think a 6600) to propane and never changed a head on any of them. Bob

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I Agree, Everyone think"s of Sodium Filled exhaust valves and seat's. I Can tell you look at the what was said above and look it up. You will find the BTU Rating of the fuels. As said above. The lower the BTU. How can can that burn valves Or an Engine?? The only thing I can think of is What it doesn't have the valve lube. (Tetra Ethyl Lead) That was used in Leaded Gasoline. I have never seen burnt vales, or valve seats! I my life time. As said above lower BTU's
The cooler it runs. AND the ENGINE Oil stay's CLEAN! why? Because there less hydrocarbons being bunt that the oil has to clean. It can be done!! With no problems!!
Also just to let you all know! When Crude Is Distilled, The Gasoline that comes out IS (WHITE GASOLINE)!! (UNLEADED)
That's what US Navy called it that in WWII ????
Bad part I see, WE paid for additives to make leaded gas.
And now WE pay MORE for the way it comes out natural after being Distilled!! Please look it up! Also for heads up, Unleaded gas is the best you can use for you'r two Cycle Equipment!! YES,
Is doesn't CARBON UP and leave deposits! The carbon deposits will break off and score the cylinder bore's. You all ready have oil mixed with right?? Why use leaded Gasoline??
On the other hand unleaded Gasoline has allot of additives,
ETHANOL is BAD, Dry out the seals, Etc. (Does NOT Run Hotter), The Lubrication Manufactures have made up for the Diff.
Hope this Helps,
MDFJ