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Minneapolis Moline Tractors Discussion Forum
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Spark Plug Gag for GVI LP

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Jeffinutah

07-20-2007 20:11:39




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Have had a GBLP for about 8 years.Over this time put in new plugs - probably gapped them .025. Op Manual says .022 .025. Starts and runs fine.

Just bought a GVI LP. Started good when when I loaded it and unloaded it and running around. Thought I would check the plug gap - Op Manual and I & T said .015! Never heard of any gap that narrow. They were all in the .21-.26 range - regapped them to .015 - since then doesn't start good at all - runs OK after getting it started. I am going to regap tomorrow to .22 -.25 and hope it improves the starting. My question is - did they really mean .015 for a GVI LP? I would think it would be the same as the GB LP. Would like to know your experience with plug gaps on LP's. Thanks

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Captainhookerus

07-21-2007 08:44:49




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 Re: Spark Plug Gag for GVI LP in reply to Jeffinutah, 07-20-2007 20:11:39  
The reason we used a narrow gap on LPG was back in those days there were no inexpensive high voltage ignition systems. With the new high tension ignition systems we are able to fire 12 to 1 compression. Plugs used to last 150 to 300 hours in 24 hr power units then if you didn't change them the coil in the mag would give up. The HEI conversions, low tension systems will let us run a whole season on 1 set of plugs gaped at .030. and wider.

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Glen_in_TX

07-20-2007 22:00:17




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 Re: Spark Plug Gag for GVI LP in reply to Jeffinutah, 07-20-2007 20:11:39  
Champion spark plug catalogs and other sources always recommended .015 to .018 gap for LPG tractors and engines. Check the timing as said in other post. The thinking is with a drier vapor type fuel you shouldn"t need that large a gap on spark plug because fuel is already more vaporized than a gasoline fuel mixture so runs and burns drier and faster. Should have a better idle with plugs gapped down like should be on a LPG engine too. You shouldn"t need a real hot plug for LPG either and run a bit colder heat range spark plug than with gasoline but with todays different propane mixes that might be some different too. For running irrigation engines on drier fuels like natural gas or LPG we had longer plug and ignition life gapping plugs anywhere from .012 to .022 depending on the size of engine or type of plug used.

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Jon Hagen

07-20-2007 20:55:02




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 Re: Spark Plug Gag for GVI LP in reply to Jeffinutah, 07-20-2007 20:11:39  
Yes !! many old propane engines specified a plug gap of 15. Check your ignition timing, changing plug gap will chang timing a few degrees.



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