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Old 08-28-2006, 08:52 PM   #1 (permalink)
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What Type Intake Manifold is Best For Propane?

I have a mildly warm Ford 400, I don't know what the cr is, I don't know the cam specs are.

I am converting it to propane and using an IMPCO 425. I have the choice of the stock 2bbl manifold, an Edelbrock SP2P small port 2bbl, an Edelbrock SP2P 4bbl or an Edelbrock Performer 4bbl.

Does propane like velocity or volume?

What is the point of the throttle plate under the mixer?

Couldn't find any of this in 'SEARCH'
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Old 08-28-2006, 09:07 PM   #2 (permalink)
 
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Originally Posted by 4XFORD
What is the point of the throttle plate under the mixer?
You need some way to control the throttle...there's no throttle control on the mixer itself. You have to use some kind of base plate.
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Old 08-28-2006, 09:10 PM   #3 (permalink)
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Quote:
Originally Posted by 4XFORD
I have a mildly warm Ford 400, I don't know what the cr is, I don't know the cam specs are.

I am converting it to propane and using an IMPCO 425. I have the choice of the stock 2bbl manifold, an Edelbrock SP2P small port 2bbl, an Edelbrock SP2P 4bbl or an Edelbrock Performer 4bbl.

Does propane like velocity or volume?

What is the point of the throttle plate under the mixer?

Couldn't find any of this in 'SEARCH'
I can lend what I believe then others will follow, maybe. an Impco 425 is plenty for a 460 so it will run a 400sb.

Propane doesn't seem to care about volume or velocity.IMHO. It is already a gas and mixes well so these two concerns seem invalid. The point I do believe to be relevant to performance is 2 or 4 bbl. Bottom end grunt of a 2bbl or highend ponies of a 4bbl? I think this remains the same for gasoline or propane. It is relative to air consumption, not mixability of the fuel/air.

I believe the things Propane "likes" are timing, compression, and boost.

The throttle plate is about the same, in effect, as a throttle body on an injection system, with out the computer. The butterflies, again, only regulate flow or vacuum. They are only neccessary to control the throttle!


Study up! Lots of info out on the net and it is relatively easy to understand.

Good luck Brotha,
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Old 08-29-2006, 02:16 PM   #4 (permalink)
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Quote:
Originally Posted by numtel
You need some way to control the throttle...there's no throttle control on the mixer itself. You have to use some kind of base plate.
OK, that makes sense.

I have 2 IMPCO 425s. both came from the local Pic-N-Pulverize. I took one off what looks to have been a recently running truck. Now that I look at it I see it has 2bbl throttle plate on it with one oblong shaped butterfly.

The other was disconnected from the intake and a MC 2150 was bolted on. This one does not have a throttle plate, instead it is a large cast alminium bowl looking thing, like you could connect a 4" hose to. What is this for?
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Old 08-29-2006, 02:25 PM   #5 (permalink)
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Quote:
Originally Posted by Easy Rick
Propane doesn't seem to care about volume or velocity.IMHO. It is already a gas and mixes well so these two concerns seem invalid. The point I do believe to be relevant to performance is 2 or 4 bbl. Bottom end grunt of a 2bbl or highend ponies of a 4bbl? I think this remains the same for gasoline or propane. It is relative to air consumption, not mixability of the fuel/air.

I believe the things Propane "likes" are timing, compression, and boost.

The throttle plate is about the same, in effect, as a throttle body on an injection system, with out the computer. The butterflies, again, only regulate flow or vacuum. They are only neccessary to control the throttle!

Then for a 6klb trail truck that has to get to and from the trail on the highway and might see some sand at the beach or desert the 4bbl Performer might be the way to go?

For a 4bbl. throttle plate, are there any other choices besides Holley and Proform?

Thanks for the advice, the more I learn about propane the better it sounds.
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Old 08-29-2006, 03:04 PM   #6 (permalink)
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Quote:
Originally Posted by 4XFORD
Then for a 6klb trail truck that has to get to and from the trail on the highway and might see some sand at the beach or desert the 4bbl Performer might be the way to go?

For a 4bbl. throttle plate, are there any other choices besides Holley and Proform?

Thanks for the advice, the more I learn about propane the better it sounds.
My 400 runs fine (low end and upstairs) with an edebr performer, mild cam and stock exh. Got my kit from gotpropane.
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Old 08-29-2006, 03:23 PM   #7 (permalink)
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My 400 runs fine (low end and upstairs) with an edebr performer, mild cam and stock exh. Got my kit from gotpropane.
Thanks OX, it sound like your setup is similar to mine. What throttle plate are you running?
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Old 08-29-2006, 03:31 PM   #8 (permalink)
 
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Originally Posted by 4XFORD
The other was disconnected from the intake and a MC 2150 was bolted on. This one does not have a throttle plate, instead it is a large cast alminium bowl looking thing, like you could connect a 4" hose to. What is this for?
It's for running dual fuel. That's how mine is set up. You run it where the air cleaner goes on your carburetor. This is how it's set up on my truck.
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Old 08-29-2006, 03:56 PM   #9 (permalink)
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It's for running dual fuel. That's how mine is set up. You run it where the air cleaner goes on your carburetor. This is how it's set up on my truck.

Yup, that's it more or less. Some info I recently found suggest you should try to get cooler outside air, as every 10* drop is worth 1% in power.

Is there a power loss from running propane through the mixer then the carb as opposed to just the mixer?
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Old 11-23-2007, 03:03 PM   #10 (permalink)
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Where did you get that elbow that mounts to your carb and mixer? I need one? Is there a part number on it anywhere?
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Old 02-21-2017, 05:48 PM   #11 (permalink)
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I know this is an old thread but...

I spoke to Cary from Gotpropane.com not too long ago and asked him about running an Impco 425 on a dual plane vs. a single plane intake. I asked him which one was better and he said that due to the nature of propane and how well it mixes with air in the mixer that it doesn't matter. He said with a single plane intake the engine will still idle fine and operate the same as it would with a dual plane intake so I went with the single plane (due to looks).

Holley makes multiple throttle base plates that work with the Impco 425, you're supposed to use a 1450 style (manual secondaries) vs. the 1460 vacuum secondary. You can convert the vacuum secondary base plate to manual but if you're buying new then the obvious choice would be a 1450 style plate.

Holley, Proform and Quick Fuel all make a 1450 styl plate. I chose the Proform one, mainly because it was billet aluminum vs. cast. I'm pretty sure Quick Fuel's version is billet also and it is anodized red.

With the Holley brand base plates you have to dig up some info on them... some have a hole drilled dead center in the plate and it has to be blocked off to prevent vacuum leaks.

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Old 02-24-2017, 11:18 AM   #12 (permalink)
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Originally Posted by 4XFORD View Post
Yup, that's it more or less. Some info I recently found suggest you should try to get cooler outside air, as every 10* drop is worth 1% in power.

Is there a power loss from running propane through the mixer then the carb as opposed to just the mixer?
Yes there is some loss due to the extra obstructions in the air flow slowing it down but the main loss would be if the timing is not set properly for propane. On a bi-fuel engine the two fuels require totally different timing curves so if it is set up for gasoline it will not run efficiently on propane and the same if the opposite. I didn't notice if you had any timing module to alter the timing in the photos but if you need one we have them. When switched to propane it will change the timing for better performance on propane. So you get the best of both fuels.
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Old 02-25-2017, 11:17 AM   #13 (permalink)
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Will a timing module work with a HEI ignition?
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Old 02-26-2017, 09:45 AM   #14 (permalink)
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are you trying to run dual fuel? if so you can use that bandaid
the chevy HEI is more work to convert for propane as it doesnt have an advance stop.
the duraspark stuff is better IMO, I wouldnt run a chevy ignition )
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Old 02-28-2017, 06:27 PM   #15 (permalink)
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magic trick is to use the 5 pin gm module. When the 5th pin gets power it retards the ignition 7 degrees. GM's cure for the hard start problem on an 80 olds Torino. Can also be used for turbo/supercharging.
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Old 02-28-2017, 08:40 PM   #16 (permalink)
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magic trick is to use the 5 pin gm module. When the 5th pin gets power it retards the ignition 7 degrees. GM's cure for the hard start problem on an 80 olds Torino. Can also be used for turbo/supercharging.
ooh, I never knew that. Nice trick!
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