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Impco 300a propane question



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Old 07-16-2010, 02:16 PM   #1
Gonzo Wheeler
 
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Impco 300a propane question

So my new to me 4.3 v-6 motor has been converted over to propane with this infamous impco 300a. It is mounted on top of a holley carb and from my research means its dual fuel. I want straight propane! Am I able to keep the 300a and run straight propane or should I pony up and buy a impco 425? I already have a model E vaporizer-------------Kyle
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Old 07-16-2010, 03:18 PM   #2
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there will be no performance advantage to going propane only. the setup you have is perfct for that motor. a 425 is alot of propane for that motor.
So i recommend hanging on to the gas carb and the propane. keep this in mind. if you get in a tight spot, you can always borrow a gallon of gasoline from a buddy to get yourself home. you cant borrow a gallon of propane.
i run dual fuel and its perfect.
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Old 07-16-2010, 07:55 PM   #3
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You don't have to use the gas side of the carb if you don't want to.
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Old 07-16-2010, 11:32 PM   #4
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I can't speak intelligently on that exact setup, but the dual fuel units that I have read about end up restricting air flow and causing a drop in performance. This may not affect this setup and you may not care that much. You should be able to pull the base plate off that carb and put it on the bottom of the 300a (I think) and be just straight propane.

I ran out of 'pane ONCE, and it was enough for me to pick up enough tanks that I could change out each morning and not have to worry about it the rest of the day. I have a 500 gallon tank that feed the house that I use to fill them up with, so I get it cheaper and easier than most would at a filling station.
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Old 07-17-2010, 10:39 PM   #5
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Quote:
Originally Posted by cambruggeman View Post
there will be no performance advantage to going propane only. the setup you have is perfct for that motor. a 425 is alot of propane for that motor.
So i recommend hanging on to the gas carb and the propane. keep this in mind. if you get in a tight spot, you can always borrow a gallon of gasoline from a buddy to get yourself home. you cant borrow a gallon of propane.
i run dual fuel and its perfect.
I think the fact I don't really know how to set it all up scares me about going dual fuel. Any tips pictures etc. of your setup??
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Old 07-20-2010, 09:28 PM   #6
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its really easy. you tune the gas side the same as you normaly would. and you tune it running on propane again the same way. sometimes you have to find a happy medium with the idle adjust screw on the carb, but its really not that hard.

like mike said above, when you are on propane, you are not using the gasoline at all, so you dont have to use it ever if you dont want to. you could run a 1 gallon gasoline tank if you want, all im saying is that its nice to have the capability of gasoline just in case.

its alot easier than you would think.
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Old 07-20-2010, 11:08 PM   #7
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Hmmm well I guess I will give it a shot!
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Old 07-21-2010, 05:46 AM   #8
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You need to find a truck already set up. Look to a farmer friend just about all of them use to run dual fuel set ups. I had a ball valve in the gas line to shut it off. Some systems ran an electric on off valve on both the gas and the propane lines. A three position switch on off on is used. You will loose performance on propane, about 15%. your engine wasn't' built for propane witch likes a lot more compression about (12 to 1).

Anyway look to the farming community for a dual fuel set up.
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