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Tool Talk Discussion Forum

Propane conversions

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Bill

09-07-2003 06:07:14




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I have a 16 horse Briggs Vangaurd powered Generator. I HATE storing gasoline & rotating it to keep it fresh. Stabilizer will help but the gasoline still absorbs moisture & there there is that safety factor of storing gasoline..
I've done a Yahoo search for propane conversions & all I ever come up with use vapor & require large tanks so they don't freeze up.
I Just brought home a Cushman truckster. Handy little devil. 18 horse Onan I believe. Runs on propane...LIQUID.. Runs forever without freezing up a 30 pound tank. Any one know where I can get a LIQUID propane conversion for my Briggs Vangaurd? I'd also like to convert to propane to extend the engine life with the cleaner fuel. The Generator I bought was a cheapie versus wattage output but to make it cheap they used a Briggs. Wish I could have afforded the Honda or a diesel.... So many toys wanted..so little $$$$$ for toys

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Bill

09-07-2003 13:45:42




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 Re: Propane conversions in reply to Bill, 09-07-2003 06:07:14  
Thanks guys! I only use propane to cook with at the house and only have 100 pound cylinders. The conversions I researched say my 16 horse will even overcome/freeze the 100 pounders... Will DEFINATELY look into IMPCO... Like most who use this forum I'm DRIVEN to do the conversion myself if I can SAFELY do it/learn from it... I've seen what propane can do by looking at a couple of the service men who have been to the house over the years. ( terrible scars..) Thanks for the lead on IMPCO!!!!!

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Jon H

09-09-2003 17:10:41




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 Re: Re: Propane conversions in reply to Bill, 09-07-2003 13:45:42  
One problem with running a liquid propane system would be how do you draw liquid LP from a 100# bottle? You would need to turn the bottle upside down to withdraw liquid LP,and I worry if that is legal or safe as the pressure relief in included in the tanks vapor valve. You might get a forklift type tank to run the generator which would have a liquid valve. You want to make sure the tank fittings are different so you can not hook a tank with a liquid valve to the heating/cooking system at the cabin. They are made for vapor only,and you risk fire or explosion if fed liquid LP

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Bill

09-10-2003 09:56:25




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 Re: Re: Re: Propane conversions in reply to Jon H, 09-09-2003 17:10:41  
Everything you say is true. I have 2 fork lift liquid tanks & a 100 pound liquid tank from a propane fired tar kettle. The fittings on the tanks are different than traditional vapor tanks so that they cannot accidentally be interchanged. THANKS!! Bill.....



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markct

09-07-2003 19:36:14




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 Re: Re: Propane conversions in reply to Bill, 09-07-2003 13:45:42  
i dont get why ya would need such a big tank, i had a forklift with a 6 cylinder GM engine and it ran fine off a 20lb gasgrill tank, i dont know of any propane forklifts that have much more than a 40 lb tank anyhow. we also have a nissan pickup that was converted to run on propane, it has a tank in the bed that cant be more than 50 gallons or so. i dont see how a little briggs could need so big of a tank. i have seen floor polishing machines that used a briggs engine of about 8 hp or so, and most use a 10 lb tank. i think your calculations are off

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Bill

09-08-2003 04:30:27




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 Re: Re: Re: Propane conversions in reply to markct, 09-07-2003 19:36:14  
Over the road vehicles, fork lifts, my cushman ect run on liquid propane. Draining off liquid does not freeze up the small tanks. Vapor powered engines require huge tanks to keep the tanks from freezing due to the refrigeration effect of the liquid flashing to gas/vapor. Most of the websites I visited selling vapor conversions confirmed that & even provided charts for engine horsepower size versus cylinder size required for vapor application. I figured out I can use any size cylinder till empty if I use a liquid conversion. As above all input is appreciated & THANKS!!!

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markct

09-08-2003 05:58:40




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 Re: Re: Re: Re: Propane conversions in reply to Bill, 09-08-2003 04:30:27  
ahh ok that makes alot more sense now, so i guess liquid is the way to go for a small engine



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Jon H

09-07-2003 12:53:36




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 Re: Propane conversions in reply to Bill, 09-07-2003 06:07:14  
A google search showed IMPCO makes an air heated vaporizer/regulator for liquid propane fuel in small aircooled engines. Check your propane supplier that handles IMPCO products. For many years I have used IMPCO propane conversion systems on liquid cooled engines,and find them very simple and reliable. The only difference in your case would be the air heated vaporizer.



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RayP(MI)

09-07-2003 10:20:58




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 Re: Propane conversions in reply to Bill, 09-07-2003 06:07:14  
Sorry, can't help you much on the propane conversion, but if you find something, I'd like to know - would like to convert the Coleman 8Hp/Briggs I have. Do you heat with propane, if so, tapping into your main tank would provide you with quite a bit of available vapor. Aslo, propane normally vaporizes down to -20F, so you probably would be OK to run most of the time anyway. (I'm new to propane, having had nat gas for years. Just lost it.) I'm concerned what happens to my need for furnace heat in the extreme cold temperatures too. As far as the Vangard, if that's the same engine I put on my lawn tractor, it is a pretty good engine - you don't need to apologize for having one. We've beat up on ours something fierce, and it keeps on going! I have a cheapy generator too - as long as you're only using it as backup, it'll last a long time, if you care for it properly. If you're powering a worksite 40hours or more a week, a better unit might be appropriate. For now, be happy with what you've got - I'tll keep your house warm, and your beef cold thru many outages. Have you contacted several propane dealers - they often will run vehicles on propane, or be able to refer you to firms that do conversions.

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