Proppane one a 350hp 351w?
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Post Fiend
Joined: Nov 2001
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From: Coutts Canada
Proppane one a 350hp 351w?
So i'm thinkin about making the addidtion of propane to my truck. Now not only is the price of propane (40 cents per litre cheaper) but also the octane rating as well because the motor that i have in my pickup is runing flattop pistons with an overall CR of about 10:1 when the head work is taken into account as well. Now my questions are, is the conversion worth it, will my carb, a 650 carter, work with the propane, and what kind of power loss should i expect?
Lastly on a sidenote, is that 650 carter carb to small for my 350hp windsor if so should i upgrade to the holley 750 double pumper that i have sittin on a shelf (after a thougho rebuild of course)?
Lastly on a sidenote, is that 650 carter carb to small for my 350hp windsor if so should i upgrade to the holley 750 double pumper that i have sittin on a shelf (after a thougho rebuild of course)?
Post Fiend
Joined: Jan 2003
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From: Iowa
Nope that carb wont work at all. It was designed for gasoline, or at least liquid fuels. The propane, being gaseous as soon as it reaches atmospheric pressure, would vaporize as soon as it entered the float bowl. Wouldn't work good if at all.
There are systems out there to convert to propane. They have a special propane "carburetor" and all the necessary lines and stuff. Maybe someone with more experience with this than I will jump in. Just know that there is NO WAY a gasoline carburetor will work with propane.
There are systems out there to convert to propane. They have a special propane "carburetor" and all the necessary lines and stuff. Maybe someone with more experience with this than I will jump in. Just know that there is NO WAY a gasoline carburetor will work with propane.
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Post Fiend
Joined: Nov 2001
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From: Coutts Canada
I know that the kits out there have the special equipment to convert the carb to run propane (dad had an 81 on propane and it used a converted motorcraft carb), i was just wondering weather or not the carb would be to small/big enough and weather or not the conversion kits could be used on the type of carb that a carter is.
Elder User
Joined: Apr 2003
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For the size and hp. you have you need a Impco 425 mixer(carb) and you wont use your carb at all. Your engine will last longer but propane is hard on exhaust valves , they must have hardened seats or they wont last.
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Post Fiend
Joined: Nov 2001
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From: Coutts Canada
I know about the exhaust valve problems and i believe that this motor had hardened seat installed with the bigger valves when all the head work was finished, but thanks for leting me know about Impco.
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I believe that since the industry switched to unleaded fuel the exhaust valves have been specially hardened to account for any issues on the exhaust valves.
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Post Fiend
Joined: Nov 2001
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From: Coutts Canada
The reason for the hardened valves is because of lubrication purposes, propane doesn't lubricate the valves like gas does and thus the reason for the hardened valves (there is also a sodium type valve if you run propane under extreme conditions like racing). This is something i found out from my dad when i talked to hime about it the other day.
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Originally Posted by mustange70
The reason for the hardened valves is because of lubrication purposes, propane doesn't lubricate the valves like gas does and thus the reason for the hardened valves (there is also a sodium type valve if you run propane under extreme conditions like racing). This is something i found out from my dad when i talked to hime about it the other day.
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