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Old August 11th, 2012, 02:47 PM   #1
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Default gas vs LP on rig

does any one know if their is a hp gain or loss when running lp?
i have a 351W I'm thinking about doing the conversion on. i don't know any one who has ever ran lp so any info would help.
and also if you know. how long average will a tank of lp go? HiLo size tank.

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Old August 11th, 2012, 03:26 PM   #2
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Without otherwise modifying the engine, its typically around 10% power loss, in theory. Since often old carb'd engines aren't running tip-top, people don't always notice much loss.
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Old August 11th, 2012, 04:27 PM   #3
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I thought propane was considered 115 octane, drops down after the canister to like 110 octane. I could be wrong, just remember someone talkin about it before.
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Old August 11th, 2012, 04:27 PM   #4
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if your going to build a dedicated LP rig i would look into running higher compression pistons as propane has a relative octane of 110. this would increase the efficiency by a decent amount.
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Old August 11th, 2012, 04:35 PM   #5
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I run LP on my Rig, I love it. FWIW it doesn't feel sluggish at all.
I've only tooled around small trails, not rocks, but I understand the benefits in articulation to a carb.
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Old August 11th, 2012, 05:35 PM   #6
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Well this is all good input. I also think I will be building a sbf to run on just Lp. Unless a decent deal comes up on a mild built one.
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Old August 11th, 2012, 05:38 PM   #7
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Are we talking like 10-1 or higher still?
What would be best compression for Lp only?
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Old August 11th, 2012, 06:08 PM   #8
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10 -1 is fine, any higher and you would need a second mixer, for most part, a E-425 mixer will do. I run a E-425 on my 472 caddy BB on my heep and could add a second but for what I do, it gets the job done. prob could run upside down, if you can keep the oil pressure up.

oh- any bigger HP motor, you would need a second Mixer and evap. because it needs more air-flow

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Old August 11th, 2012, 06:14 PM   #9
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so good readings on LP here
http://fuelsforum.rasoenterprises.co...f1c133cd7859b0
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Old August 11th, 2012, 06:17 PM   #10
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Not building it big hp. Maby a pair of OTC heads down the road.
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Old August 11th, 2012, 06:31 PM   #11
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Lp is fail prof, if you go LP, just a few things to remember, advance your timing and run colder plugs for 110 octan, seal up any vacuum leaks good, Lp hates vacuum leaks
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Old August 11th, 2012, 06:35 PM   #12
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Lp is fail prof, if you go LP, just a few things to remember, advance your timing and run colder plugs for 110 octan, seal up any vacuum leaks good, Lp hates vacuum leaks
I like fail proof....

I'm starting a buggy build. Gathering parts and info before I'm over my head in it.
I've noticed a lot of guys running LP and I figured it was mainly because of off camber situations, and also because of lack of funds to run a nice efi. So it sounds like this fits my needs good!!
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Old August 11th, 2012, 06:44 PM   #13
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Lp burns cleaner, and doesn't build up carbon like gas does, your engine, and oil will stay cleaner longer, I plan on running my 304 on Lp, and my brother is running his 401 on it also, I've heard you get good run times out of a hi-Lo tank, obviously depends on how you wheel, but I've heard guys can.go all.day on a tank if not more, and being its higher octane its cheaper than gas
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Old August 11th, 2012, 07:00 PM   #14
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At around 40$ to fill Hilo tank that's cheep compared to 110 for a days worth!
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Old August 11th, 2012, 07:05 PM   #15
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30 lbs forklift tank should last all day, if it doesnt you have a leak, adding a tee and a 20lbs bbq tank upside down to refill on the trail
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Old August 11th, 2012, 07:30 PM   #16
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I have room for 2 tanks in the rear if my rig.
Is their one kit that is better than another? I've been looking at the kit that jasper sells.
http://www.jasperengines.com/rock-crawler.php
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Old August 11th, 2012, 07:58 PM   #17
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most impco kits are the same, just gotta shop around, or search for used at a cheeper price

http://www.gotpropane.com/p1.html

http://www.nashfuel.com/
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Old August 12th, 2012, 01:50 AM   #18
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30 lbs forklift tank should last all day, if it doesnt you have a leak, adding a tee and a 20lbs bbq tank upside down to refill on the trail
Unless you have the old style valve on the 20lb tank, that propane places are prohibited from filling, this is not possible.
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Old August 16th, 2012, 06:13 AM   #19
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Unless you have the old style valve on the 20lb tank, that propane places are prohibited from filling, this is not possible.
There is a special fitting and adapter for using a grill tank in emergencies. I am 150% satisfied with my propane set up. I didn't notice any power loss. Plus being able to attempt some sketchy lines with out it sputtering is great!
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