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Gas\Diesel Engine & Transmission:

4.3L TBI to Propane



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Old 03-05-2009, 10:04 PM   #1
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4.3L TBI to Propane

So I am swapping out my Yota 22R with propane to a 1993 4.3L V6 TBI & TH350 to run my existing propane setup.
What do I need to change from the V6 to get it running on propane in a simple manner without all the additional wiring?
I know that a bigger 425 mixer will need to be added to the existing propane kit. Anyone else running a 4.3L on Propane?

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Old 03-05-2009, 10:19 PM   #2
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probably need a model E i think it is regulator
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Old 03-06-2009, 05:58 AM   #3
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Please post up as I will be doing this swap later in the year.

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Old 03-06-2009, 10:23 AM   #4
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The existing propane gear will carry over from my existing setup (converter, mixer, tank, lines, lockout, regulator and such.)
As for the 4.3L, I believe it will require a different carb type intake manifold, & a vacuum advance HEI distributor. Not sure what else I might be missing?
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Old 03-07-2009, 09:03 AM   #5
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Theres a couple way to do this swap. I was going to do it. but stayed with the tbi stuff. Just to but a harrness was cheaper like under $300 for the harness. From AFI

One you can find the high dollar mixer that fits te tbi intake.$$$$

Two you can find or making a adpater plate to find the intake and mixer. Havent seen to many.

Three buy a marine intake that fits the tbi heads but is made to fit a carb. And your mixer well bolt right to it. One of the aftermarket intake company's makes one to. But watch it they make one for a tbi and vortec. They have different heads.

And your need a distribator from a carb motor or a hei one.

But i did hear that the propane on a tbi motor gets read of the throddel lag they have.
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Old 03-07-2009, 11:47 PM   #6
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I love this thread. Even the mention of tbi to pane to some of my friends gets their blood boiling. They would kill me if I did something like this to an 8.1 or other high hp bowtie engine when I decide the tree-fitty aint cuttin it no mo!
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Old 03-07-2009, 11:55 PM   #7
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Quote:
Originally Posted by dragoonranch View Post
I love this thread. Even the mention of tbi to pane to some of my friends gets their blood boiling. They would kill me if I did something like this to an 8.1 or other high hp bowtie engine when I decide the tree-fitty aint cuttin it no mo!
yea...i already have my adaptor set back. So if/when the time comes.....8.1 on pane. Now i just have to get a stand alone harness....oh, and a 8.1
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Old 03-08-2009, 12:19 AM   #8
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yeppers, just need to start investing in lottery tickets.
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Old 03-08-2009, 05:09 PM   #9
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Quote:
Originally Posted by RamRock View Post
Theres a couple way to do this swap. I was going to do it. but stayed with the tbi stuff. Just to but a harrness was cheaper like under $300 for the harness. From AFI

One you can find the high dollar mixer that fits te tbi intake.$$$$

Two you can find or making a adpater plate to find the intake and mixer. Havent seen to many.

Three buy a marine intake that fits the tbi heads but is made to fit a carb. And your mixer well bolt right to it. One of the aftermarket intake company's makes one to. But watch it they make one for a tbi and vortec. They have different heads.

And your need a distribator from a carb motor or a hei one.

But i did hear that the propane on a tbi motor gets read of the throddel lag they have.
Looks like I may go the cheaper route and fab a adapter to the existing manifold. After some further searching, it appears that some have already achieved this setup.
Great suggestion!

Modded TBI intake manifold


Throttle plate adapter to mixer

Complete
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