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Old 09-22-2002, 11:49 AM   #1 (permalink)
 
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Dual propane carbs

can you run two propane carbs, other that the dual carb manifold what else would you need??...or can you even do this.
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Old 09-22-2002, 12:05 PM   #2 (permalink)
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Piece of cake. I think one mixer will work just with a T

Look up propane guy
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Old 09-22-2002, 05:21 PM   #3 (permalink)
 
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Re: Dual propane carbs

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Originally posted by MOFUGRA
can you run two propane carbs, other that the dual carb manifold what else would you need??...or can you even do this.
why
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Old 09-22-2002, 07:27 PM   #4 (permalink)
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The why is to get enough air flow through the motor. AFAIK the biggest propane carb out there is the 425 and it flows a little under 600 CFM if I remember right, and I think it depends on the base you use. Most conversions on big blocks use two carbs and I think two converters.
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Old 09-22-2002, 07:37 PM   #5 (permalink)
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the 425 will work just fine
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Old 09-22-2002, 07:43 PM   #6 (permalink)
 
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Re: Re: Dual propane carbs

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why
ya i guess more power sucks, what was i thinkin.........
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Old 09-22-2002, 07:49 PM   #7 (permalink)
 
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Re: Dual propane carbs

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Originally posted by MOFUGRA
can you run two propane carbs, other that the dual carb manifold what else would you need??...or can you even do this.
Don't know if this is any help or not, but here is a pic of a guy running dual propane.
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Old 09-22-2002, 07:56 PM   #8 (permalink)
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I use a single Impco 425 mixer which is good to handle up to about a 375 hp motor. It's the biggest mixer that I found that still has an idle circuit. I use this on a 420 c.i. small block chevy with a mild cam and 10.3 to 1 compression. It works very good for what I do with it.

To flow more propane and air you'll need two mixers, two regulators, a dual quad manifold(single plane works best for propane), Split the main propane hose with a "Y" fitting to each regulator and setup the linkage so both mixers come on at the same time(don't try to make it a progressive linkage).

And use a Huge tank
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Old 09-22-2002, 07:58 PM   #9 (permalink)
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I was just looking at a LP site and they offered a baseplate that would allow you to run two mixers on a single carb intake.

A single 425 is not up to snuff for a 454 from what I understand. My uncle worked for aplace that had LP 454 tow rigs and they all ran dual carbs.
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Old 09-22-2002, 08:01 PM   #10 (permalink)
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Don't mount the regulator on it's back, like in that photo above. It needs to be mounted so the vapor port to the mixer is on the bottom or water will accumulate in the regulator.
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Old 09-22-2002, 08:07 PM   #11 (permalink)
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Quote:
Originally posted by DUG
I was just looking at a LP site and they offered a baseplate that would allow you to run two mixers on a single carb intake.
I've heard they don't work very good, trying the funnel the air flow of two 4 barrels into a single 4 barrel manifold
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Old 09-23-2002, 04:40 PM   #12 (permalink)
 
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Re: Re: Re: Dual propane carbs

ya i guess more power sucks, what was i thinkin......... [/QUOTE]
lol sounds like your just trying to fawk up a good thing. if you just what to poor fuel in there stick to that gas carb and keep her wound up

Last edited by JIM3030; 09-23-2002 at 04:41 PM.
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Old 09-23-2002, 05:22 PM   #13 (permalink)
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A friend of mine runs 2 Impco 300A mixers, both hang upside down (hood-clearance) on either end of a T (made by Impco), which sits on top of a 4bbl carb on a 318. Overkill imho, i only run one 300 on top of a #1406 edelbrock carb, also on a mildly hopped up 318. If I absolutely need those few extra horses, i just switch over to gasoline. Only problem with gas are the sometimes steep angles confusing the carb floats.
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