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Old 01-03-2003, 04:38 PM   #1 (permalink)
SOS
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Having trouble with propane setup

I have recently installed propane in my toyota powerd suzuki samurai. Every thing seems to be working fine but I still have not gotten the engine to run. I have spark (with a MSD). and the propane is going from the tank to the fuel lock off and when vacume is applyed the the lock off it flows to the regulator. I took the regulator apart to check what was going on there and all the diphrams are in good shape and everything else seemed to be in working order. the intake is producing vacume to activate the regulator but every thing is still a no go ( 225 mixer is working) this is such a simple setup I don't understand what is wrong. any Ideas will help at this point
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Keith
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Old 01-03-2003, 04:45 PM   #2 (permalink)
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New lock out? Try pulling the line off of the moxer and sucking on it to activate it while trying to start it...if you taste propane, then it probably has a tear in the inner diaphram..rebuilding it is very easy.
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Old 01-03-2003, 04:52 PM   #3 (permalink)
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I tried the lock out test and it is functioning properly no propane taste the propane is definalty geting past that. I'm down right confused about what it could be
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Keith
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Old 01-03-2003, 05:04 PM   #4 (permalink)
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Did you adjust the timing to compensate for the propane set up?
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Old 01-03-2003, 06:38 PM   #5 (permalink)
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No, I have to adjust the timing? How should it be adjusted?
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Keith
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Old 01-03-2003, 06:51 PM   #6 (permalink)
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"Propane engines seem to operate better with slightly advanced (as compared to gasoline) ignition timing profiles at engine speeds below 1500 rpm, approximately the OEM timing advance at 2000 rpm, and approximately 5 to 10 retarded from OEM at 3,000 rpm.

Propane engines with compression ratios in the range of 8.0 to 1 to about 8.5 to 1 should have initial timing around 8 btdc with a total of no more than 48, all in by 3,000 rpm.

Engines with compression ratios from 8.8 to 1 to about 9.2 to 1 should have an initial timing of no more than 6 btdc and a total of 38 to 42 btdc, also in by 3,000 rpm.

Engines with compression ratios from 9.3 to about 9.6 to 1 should have an initial timing of no more than 4 and a total advance of 38 btdc, by 2600 rpm.

Engines over 9.8 to 1 (and no more than 11.0 to 1) should have the initial timing set at 4 with a total timing of 32 btdc by 2600 rpm."

All from here
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Old 01-03-2003, 07:02 PM   #7 (permalink)
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Thanks I will give that a shot
Keith
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Old 01-03-2003, 07:52 PM   #8 (permalink)
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just out of curiosity you have tried to start it with your foot on the gas? I don't know why but my propane bus will not fire up unless I have it matted, as soon as it lights it will idle at -30 celcius.
anyone have an explanation for this?
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Old 01-04-2003, 09:55 AM   #9 (permalink)
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I don't know about your setup, but my Impco 300A is extremely sensitive to vacuum leaks. Even the tiniest vacuumleak will mean i'll have to start it on gasoline.

Telltale signs of vacuumleaks: unstable idle, and fluctuating vacuumreadings.

Another simple test: with the engine running: blow gas from e.g. a soldering torch at the suspect gaskets and seals. If the idle rpm changes (goes up) the engine obviously sucks in a bit of extra fuel through the leak. This also works with brake cleaner, which is a bit more dangerous, just imagine what will happen when you accidentaly spray any flammable liquid on an exhaust header for instance..
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Old 01-04-2003, 05:33 PM   #10 (permalink)
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Quote:
Originally posted by mytzlflick
just out of curiosity you have tried to start it with your foot on the gas? I don't know why but my propane bus will not fire up unless I have it matted, as soon as it lights it will idle at -30 celcius.
anyone have an explanation for this?
Normally it is because the idle is set a bit low and the motor will not make the vacum needed to open the lock or activate themixer without the throttle plates open more.
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