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Propane Problems!



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Old 08-30-2006, 08:40 PM   #1
 
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Exclamation Propane Problems!

I just installed propane on my chevy 350. I used the 450 mixer. It’s running like crap! I tried timing it but that didn’t really help. It has no power. Can anyone who installed propane on there truck help me? I'm 30 min north of Dallas if anyone is near by.
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Old 08-30-2006, 08:43 PM   #2
 
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have you tried adjusting the fuel mixture? try by richening it up as far as you can and just lean it out while testing out the full throttle launches, once it starts to spudder or ping, back it off and your there.

also, what do you mean by runs like crap? be more descriptive...

also 2, is this new or used equipment?
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Old 08-30-2006, 09:14 PM   #3
 
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I added MSD6 for a hotter spark and it helped a lot (after tweaking the adjustments).
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Old 08-31-2006, 04:55 PM   #4
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On mine I had to advance the timing ALOT to get it to run right. Could you have a vacuum leak?
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Old 08-31-2006, 07:44 PM   #5
 
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Quote:
Originally Posted by dukguy
On mine I had to advance the timing ALOT to get it to run right. Could you have a vacuum leak?
Yes I remember now, it did take a touch or two of advanced idle timing to get it to run right.
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Old 09-01-2006, 02:59 PM   #6
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I will explain his "runs like crap" statement. The truck just has no power, and is running hotter than usual. The truck did not have alot of power before, and I thought it was because of his carb. He couldnt climb or go down hardly any incline without stalling. He is very new to the wheeling thing and his automotive knowledge is limited.
I am helping him with this but I have no experience with propane. We have advanced the timing with little result. He is going to buy a timing marker for the block because the PO removed it. Right now we don't know what the timing is set at, but we know it is about 7 degrees more advanced than it used to be. (picked a spot on the water pump and checked timing before, then adjusted it 7 degrees.)
Which screw is for adjusting the mixture? as the "carb" sits on the manifold, in the front, there is an allen head screw with a spring on it, what looks like a plug to the passenger side of the allen head screw. I can't remember any others right now. I have gone over there a couple of nights to try and help him out and don't remember if I saw any other screws for the "carb". All help and knowledge is appreciated.

Leper


*EDIT*
All of the equipment is new. Haven't noticed any vacuum leaks. We had checked before the propane conversion, we will check again
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best way I know what mods are necessary is go wheeling and at the end of an obstacle look at all the rigs that made it. now was it driver or parts?
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Old 09-01-2006, 07:06 PM   #7
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There is a guy who goes by the nick "propaneguy" on Pirate4x4 who is a vendor and guru on this type of stuff. You might try him--

http://www.pirate4x4.com/forum/member.php?u=20650
http://propaneguy.com/
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Old 09-01-2006, 08:04 PM   #8
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Quote:
Originally Posted by LEPER
The truck just has no power, and is running hotter than usual. The truck did not have alot of power before,
It had a carb before? You mean the water temp is hotter than before the propane swap?
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Old 09-01-2006, 08:57 PM   #9
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Quote:
Originally Posted by dott
It had a carb before? You mean the water temp is hotter than before the propane swap?
he had a holley street avenger.
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Old 09-01-2006, 09:01 PM   #10
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Tom,

Was the water temp hotter even before advancing the timing?

I'm thinking the only reason for the engine to run better with "way" advanced timing is:

Well, running a stock (compression) engine on propane you lose power because of the lower energy density of the fuel. That is why you need to run a higher commpression ratio to get really good performance. That is not to say that it wont run "well", you just won't get as much power out of it. But in off-roading, IMO, it's worth a power trade off if the engine will run reliably.

I could be way off, but I think the timing change is an attempt to make up for (essentially) an under-compressed engine.

Does this make sense or am I dope?

How does this help? Beats me. I just think maybe the mixer might not be the problem.

How old is the engine? Did you ever do a compression check on it?

When you say "It has no power", do you mean it won't pull your hat off, or it isn't as strong as with the carb?
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Last edited by dott; 09-01-2006 at 09:10 PM..
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Old 09-02-2006, 03:48 PM   #11
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Quote:
Originally Posted by dott
When you say "It has no power", do you mean it won't pull your hat off, or it isn't as strong as with the carb?
Think V6. The motor was not healthy before. Assumed the carb was out of adjustment. He decided to go propane because of the carb always stalling on the slightest of inclines. He is just frustrated right now. I have recently been told to back the mixture screw off untill it almost dies and then turn until the idle is smooth. Is that correct? The first thing we need to do is set the timing. Nothing else can be done untill that part is correct.

Keep the thoughts coming.
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Originally Posted by texasfrog View Post
best way I know what mods are necessary is go wheeling and at the end of an obstacle look at all the rigs that made it. now was it driver or parts?
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Old 09-02-2006, 06:12 PM   #12
 
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call cary at gotpropane.com very good- built systems for the government i bought my system from him and it out performs my carb any day of the week. he can tell you anything you need to know
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Old 09-02-2006, 08:39 PM   #13
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Quote:
Originally Posted by LEPER
The motor was not healthy before.
This may be the problem.

Quote:
Originally Posted by LEPER
Assumed the carb was out of adjustment. He decided to go propane because of the carb always stalling on the slightest of inclines.
I'vr only seen a handful of carb'd rigs run well on inclines. That's why I swapped to fuel injection. Propane works great with the side benefit of the fuel never going bad.

Did he ever do a compression check?
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Old 09-03-2006, 09:38 AM   #14
 
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i agree with dott. do a compression check and make sure the engine is healthy enought to run well at all. that being said i ran around 32d of total timing on my rig with 8.5:1 compression and pane. it was a ***** to turn over and start and ran a little warm, but it would run like a raped ape.
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Old 09-03-2006, 01:07 PM   #15
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Is the motor low on compression? Propne loves high compression. JJ
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Old 09-05-2006, 01:05 PM   #16
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Quote:
Originally Posted by LEPER
Which screw is for adjusting the mixture? as the "carb" sits on the manifold, in the front, there is an allen head screw with a spring on it, what looks like a plug to the passenger side of the allen head screw.
Leper
We haven't done a compression check yet. Nor have we done a leakdown. When the timing is really far advanced, the truck is very hard to start.(As mentioned above) The motor has a mild rebuild on it. Assuming near stock compression.
When I stated before that the truck had trouble on inclines, I was referring to parking lots and driveways. The carb was junk. Period.
I will check the links provided for more of my in depth questions. I was just trying to find out the mixture adjustment screw location so I could eliminate that issue before I called the pros.

Thanks for the help so far. Keep the thoughts coming.
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Quote:
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best way I know what mods are necessary is go wheeling and at the end of an obstacle look at all the rigs that made it. now was it driver or parts?
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Old 09-07-2006, 02:48 PM   #17
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Quote:
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best way I know what mods are necessary is go wheeling and at the end of an obstacle look at all the rigs that made it. now was it driver or parts?
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