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60 propane pistons in late jd a

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jk tb

12-13-1999 21:33:45




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i am installing 60 propane pistons in a 1952 jd a that i plan to use in tractor pulls what kind of hp gain can i expect from the factory 38 hp . also i guesstimate that it will give me 7 to 1 comp ratio and i would like to get it to at least 8 to 1 or more .i'm on a budget and this needs to be a low cost project thanks for any info you can give me jk




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al

12-15-1999 20:29:45




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 Re: 60 propane pistons in late jd a in reply to jk tb, 12-13-1999 21:33:45  
Yo could get Merfeld to weld you up a set of longer rods $30.00 ea. you supply rods.Then you could get the compression you are looking for.

al



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Chuck

12-14-1999 12:55:56




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 Re: 60 propane pistons in late jd a in reply to jk tb, 12-13-1999 21:33:45  
In reply to the pistons and response, used hi-octane, great ignition, but excessive compression also means high vacumn pressure to carb and manifold, it was like leaning out. While I realize I could have recalibrated the carburator, bored out main jets, and the like to give it more fuel, I decided to opt to remain standard the compression. While I don't doubt you could doctor with hi engery ignition, timing, carb and get the power I found this would be too tedious and expensive for average usage. I really believe valve size is a factor, and one should go to bigger valves with the compression changes, maybe even regringing the cam for more lift? sounds like souping up to me?

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DougS

12-14-1999 16:36:16




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 Re: Re: 60 propane pistons in late jd a in reply to Chuck, 12-14-1999 12:55:56  
Yes, it is "souping up". He/She wants to pull this tractor, and putting in these pistons is not hard and the engine will not be a tuning nightmare. It will make the old "A" pop a little harder. To jk tb...If you are running the old ramp head and these pistons, pump gas will do fine and you will enjoy the noise out the pipe. Go for it, being you have the pistons, it is a cheap way to gain some HP!!!

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Chuck

12-14-1999 10:39:01




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 Re: 60 propane pistons in late jd a in reply to jk tb, 12-13-1999 21:33:45  
I'm confused by the comments. I had the following experience with a 520. Was sold some propane pistons as hi-altitude...on these pistons there are no notches as the plug fires in the head. Any way the darn thing produced 150 #s compression and I never could get it to run properly. Too much compression can be a bad thing, the carb is not calibrated properly for combustion...went back to standard and it runs exceeding good. I don't know about your piston deal, I'd check this out thoroughly before I spent a wad of money.

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Andy

12-15-1999 17:08:14




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 Re: Re: 60 propane pistons in late jd a in reply to Chuck, 12-14-1999 10:39:01  
Hey Chuck,
Do you still have those 520 LP pistons?? Are they for sale? If so , I may be looking for a set for our 520LP. Andy



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DougS

12-14-1999 11:51:32




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 Re: Re: 60 propane pistons in late jd a in reply to Chuck, 12-14-1999 10:39:01  
Alot of things could have contributed to your 520 not running right. Spark for one, and with an increase in compression, your ignition needs to be up to par. As far as the carb being out of whack, that is possible, but one needs to look at the quality of the fuel. If the octane level was not enough, this would prevent it from running right. Too much compression can lead to other problems, but it does not hurt power output if you get everything right! Doug in TX

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Mike Aylward

12-14-1999 06:56:23




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 Re: 60 propane pistons in late jd a in reply to jk tb, 12-13-1999 21:33:45  
The compresion ratio in a 60 LP is 7.3:1. You will have about 1/2 point less in an A because of the deeper combustion chamber. If your rules allow, a 60 head will gain that back, plus help out with the double barrel carburetor. Even if you just install the pistons, you should have the same or just slightly more than M&W-style aluminum pistons. Hope this helps. Mike



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Z-bar

12-13-1999 23:16:38




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 Re: 60 propane pistons in late jd a in reply to jk tb, 12-13-1999 21:33:45  
jk tb. The parts man at the tractor salvage yard showed me a set of 60 propane pistons the other day. they are 1/8 in. longer than the late A pistons. He said they would work in the late A blocks with the slanted plugs, but not in the older straight plug blocks. Dont know how much comp. they would add.



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mark

12-14-1999 05:36:24




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 Re: Re: 60 propane pistons in late jd a in reply to Z-bar, 12-13-1999 23:16:38  
i've got a set of 620 pistons in a 36 A. the notch in the pistons allow enough spark to do its job. runs very well..



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