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Tractor Pulling Discussion Forum

LP distributor

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Terry Hahn

09-26-2005 15:37:06




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I have a 50G pulling tractor. I have bored engine .125-over and I'm using M&W pistons. I was wanted to know a few things:

1. What should I set the plug gap at.
2. Will a LP distributor help with pulling.
3. I'm using distributor w/ elec. ign. and when engine is cold it will backfire when I try and start tractor. This only happens when engine is cold not when it is warm. What can be causing this.
Any help with these questions will be appreciated.
Thanks

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buickanddeere

09-26-2005 16:04:26




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 Re: LP distributor in reply to Terry Hahn, 09-26-2005 15:37:06  
#1 Depends on the plug make/type, compression pressure, ignition coil, ignition system voltage, rpms, fuel type, fuel ratio, plug wire composition, condition/gap between the cap and rotor. #2 THe LP dist may let your tractor into a lighter class as it made your wallet lighter. #3 Unburned fuel in the exhaust system from the 1st few rotations is being ignitied the 1st time a cylinder fires.

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John T

09-27-2005 06:26:41




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 Re: LP distributor in reply to buickanddeere, 09-26-2005 16:04:26  
GT, Isnt there something different or wierd on those LP Distributors like they run the opposite direction or something, you know?? I should but obviously dont lol. Even if the same direction they likely got a different advance curve but its still hard to figure those things out unless youre hooked to a Dyno. Merely as a guess I would start with a plug gap around 0.040 to 0.045 n go from there, but like you say all those varaibles make it a hard call unless one could couple to a Dyno n tweak the gaps to see whats really the best Eh???

John T

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buickanddeere

09-30-2005 07:29:27




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 Re: LP distributor in reply to John T, 09-27-2005 06:26:41  
The LP dist on a 1st numbered tractor runs at 1/2 crank speed. The lettered and 1st numbered run the dist at crank speed. Some people think increased cam overlap could make the engine go "bang".



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Terry Hahn

09-30-2005 18:10:41




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 Re: LP distributor in reply to buickanddeere, 09-30-2005 07:29:27  
That what a fellow puller said I need to get because it only fires on the compression stroke instead of every stroke like the regular disrtibutor. He also said that might help stop the backfiring when cold since it only fires on the compression stroke.



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super a dude

10-03-2005 10:43:52




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 Re: LP distributor in reply to Terry Hahn, 09-30-2005 18:10:41  
believe me, there not all there cracked up to be, we"ve ran both styles, and i"m convinced a mag is better then both, it there hot enough.



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