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propane troubleshooting...
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<blockquote data-quote="altfuel1991" data-source="post: 588302" data-attributes="member: 1211"><p>From what you have described the engine is flooding out. You said that when you opened the valve on the tank you heard a hissing sound at the mixer. That should not happen. There should be no fuel flowing if the engine is not running. It takes vacuum from the engine to open the vaporizer and allow fuel to flow. The vaporizer probably needs to be rebuilt. When the system is right the engine should spin just 3-4 rounds and fire up with a smooth idle. You noted the system was not new so we no not know what issues the previous owner was having. The power adjustment may be off as well since it was on a 22R engine. That mixer is way too big for that engine under normal circumstances.</p><p></p><p>As far as the timing, you have to remember that propane is totally different from gasoline in the way it burns. It is higher octane but does not burn slower like high octane gas. Here are the general guidelines for setting the timing for any engine on propane.</p><p></p><p>On most applications, the timing should be a total of 30 degrees(base and centrifugal) with all of it in by 2500 rpm. What we normally do is disconnect the vacuum advance, run the engine up to 2500 rpm, set the timing at 30, lock it down, then let it idle with the vacuum advance disconnected. See what your base timing is running. If it is low,4-10 degrees for example, you can alter the centrifugal to lower that number and increase the base, still keeping a total of 30 degrees. As you increase the base timing check to see if the engine spins and starts smoothly when hot. If you reach a point that the engine bucks or loads the starter, back off about 3-4 degrees and that is your base timing. Subtract that number from 30 degrees and that will be the advance you need to have. This will provide a good start, strong idle and proper advance curve. We have had some engines run as much as 20 degrees base timing but 14-16 degrees is normal. The vacuum advance should be connected to ported vacuum and have no more than 10 degrees. This helps fuel economy at light throttle positions. </p><p></p><p>Give me a call if you need more help figuring it out.</p><p>Buddy- Precision Sales & Service</p><p>205-591-2266</p><p></p><p>__________________</p></blockquote><p></p>
[QUOTE="altfuel1991, post: 588302, member: 1211"] From what you have described the engine is flooding out. You said that when you opened the valve on the tank you heard a hissing sound at the mixer. That should not happen. There should be no fuel flowing if the engine is not running. It takes vacuum from the engine to open the vaporizer and allow fuel to flow. The vaporizer probably needs to be rebuilt. When the system is right the engine should spin just 3-4 rounds and fire up with a smooth idle. You noted the system was not new so we no not know what issues the previous owner was having. The power adjustment may be off as well since it was on a 22R engine. That mixer is way too big for that engine under normal circumstances. As far as the timing, you have to remember that propane is totally different from gasoline in the way it burns. It is higher octane but does not burn slower like high octane gas. Here are the general guidelines for setting the timing for any engine on propane. On most applications, the timing should be a total of 30 degrees(base and centrifugal) with all of it in by 2500 rpm. What we normally do is disconnect the vacuum advance, run the engine up to 2500 rpm, set the timing at 30, lock it down, then let it idle with the vacuum advance disconnected. See what your base timing is running. If it is low,4-10 degrees for example, you can alter the centrifugal to lower that number and increase the base, still keeping a total of 30 degrees. As you increase the base timing check to see if the engine spins and starts smoothly when hot. If you reach a point that the engine bucks or loads the starter, back off about 3-4 degrees and that is your base timing. Subtract that number from 30 degrees and that will be the advance you need to have. This will provide a good start, strong idle and proper advance curve. We have had some engines run as much as 20 degrees base timing but 14-16 degrees is normal. The vacuum advance should be connected to ported vacuum and have no more than 10 degrees. This helps fuel economy at light throttle positions. Give me a call if you need more help figuring it out. Buddy- Precision Sales & Service 205-591-2266 __________________ [/QUOTE]
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