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Tractor Pulling Discussion Forum

Raising compression in a 1935 JD A

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Vinnie R

08-03-2007 07:37:48




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What is the cheapest way to raise compression on an unstyled A engine. Pistons, long stroke crank, etc...?? I'm only looking to get about another 10 HP out of the old girl. She runs like a top, but doesn't quite have the power of the tractors that it's pulling against. Let me know your thoughts. Vince.




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dboll

08-03-2007 11:20:36




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 Re: Raising compression in a 1935 JD A in reply to Vinnie R, 08-03-2007 07:37:48  
we had a couple of A's with longer rods on our circuit a few years back, ran pretty good, easy to compute the cyl. volume on a 2cyl. then make the rods the length you need for the desired comp. ratio



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VinnieR

08-03-2007 08:17:13




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 Re: Raising compression ratio in a 1935 JD A. in reply to Vinnie R, 08-03-2007 07:37:48  
Sorry, what I meant so say was compression ratio, not compression. For an old tractor, compression is great. I'm looking to raise compression ratio.



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dboll

08-07-2007 04:59:13




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 Re: Raising compression ratio in a 1935 JD A. in reply to VinnieR, 08-03-2007 08:17:13  
compression is the result of the comp. ratio which is the ratio you compress the volume in the cyl. i think i would leave it together as it appears you are already way over your head!



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Big Jugs

08-03-2007 09:54:40




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 Re: Raising compression ratio in a 1935 JD A. in reply to VinnieR, 08-03-2007 08:17:13  
Find a crankshaft from a styled A, adds a 1/4" to stroke. Also grab the rods to go with it. Can't use styled crank and unstyled rods together. Check around, you can probably come up with a crank someplace for 50-75 bucks.



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RODS

08-03-2007 09:47:23




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 Re: Raising compression ratio in a 1935 JD A. in reply to VinnieR, 08-03-2007 08:17:13  
Make the rods longer, by far the cheapest way to go!



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Vinnie R

08-03-2007 09:58:55




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 Re: Raising compression ratio in a 1935 JD A. in reply to RODS, 08-03-2007 09:47:23  
Ok, I'm sure this has been covered before by others but on a completely stock engine, without grinding, cutting, or other drastic modifications, what is the maximum length connecting rod that would be able to be dropped in? I'm looking to do something by the end of the month.



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Tom W

09-12-2007 14:23:53




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 Re: Raising compression ratio in a 1935 JD A. in reply to Vinnie R, 08-03-2007 09:58:55  
Im not totaly shur but you can shave some off of the back of the head or front of the head.



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