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Why LP Distributor

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John

10-01-2001 18:01:11




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I have noticed that on several of the ads for JD pulling tractors that LP distributors are used. What is the advantage of the LP dist?




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Clooney

10-01-2001 19:07:35




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 Re: Why LP Distributor in reply to John, 10-01-2001 18:01:11  
John, the LP has a gear reduction so it only fires every other time the piston comes up. The standard one fired every revolution so it also fired on an open exhaust valve. That wasn't a problem on a production tractor but can be a problem if a longer duration cam with more valve overlap is used. I'm not real sure why the LP used the 1/2 speed distributor but it must have had something to do with a backfire & the fuel converter.

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The Stranger

10-01-2001 20:06:41




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 Re: Re: Why LP Distributor in reply to Clooney, 10-01-2001 19:07:35  
Clooney, you're right about that. From what I've been able to glean, the reason they went to the 1/2 speed distributor drive was that there was some fear of ignition on the exhaust stroke, since there was a slight valve overlap. Might have been overkill, but probably better safe than sorry.



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Craig

10-01-2001 20:37:10




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 Re: Re: Re: Why LP Distributor in reply to The Stranger, 10-01-2001 20:06:41  
The 1/2 speed distributor is extremely important with propane back then as well as today. I know of someone who does propane conversions of modern fuel injected vehicles. Those vehicles are using distributorless ignition systems that fire every revolution. With propane fuel on these vehicles you have an explosive mixture all the way from the intake valve through the intake manifold, through the throttle plates, through the air intake where to where the propane mixer is. The extra spark can cause a big explosion when trying to start the enignes. Less of a problem after the engine is actually running. They have to got to some exotic measures to get these modern fuel injected autos to run safely on Propane.

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