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Tractor Pulling Discussion Forum

need more 720 gas HP

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720deere puller

12-16-2012 17:36:49

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Needing contact info or any info on increasing hp on a stock 720 gas, pulling in 8500 & 9500lb. classes. Any help would be greatly appreciated.

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12-17-2012 13:35:29

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 Re: need more 720 gas HP in reply to 720deere puller, 12-16-2012 17:36:49  
there was a post on this forum a couple years ago where a guy said he went to 77 hp with the addition of diesel pistons . take it for what it's worth could just be hear say . that's a 22 hp jump from stock .

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12-18-2012 10:27:41

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 Re: need more 720 gas HP in reply to dblair, 12-17-2012 13:35:29  
Maybe onto something? The gas and diesel used the same 6-3/8 inch stroke. The diesel bore is 125 thou larger at 6-1/8". Must have required some high octane fuel, couldn't even guess the compression ratio. 720AF 4.9 to 1, 720gas 6.14 to 1 and 720LP 7.94 to 1. Even the LP pistons are an 29% ratio increase over the gas.

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12-17-2012 13:20:19

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 Re: need more 720 gas HP in reply to 720deere puller, 12-16-2012 17:36:49  
Higher compression. Re-ground camshaft. Port and manifold matching. Blend and smooth casting flash and sharp edges from the inside of the ports. A professional 5 angle valve job by a race engine shop, not a valve job by Bubba . Dry air cleaner element . Propane intake and exhaust manifolds. Will make an easy 75HP at pto rpm.

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Josh Blackburn

12-16-2012 18:41:45

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 Re: need more 720 gas HP in reply to 720deere puller, 12-16-2012 17:36:49  
How much power are you looking for. I have a real nice set of lp pistons. They will be a quick and easy 10 hp they Look brand new or can do something more. 9892775366

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Lee DePew

12-20-2012 15:05:37

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 Re: need more 720 gas HP in reply to Josh Blackburn, 12-16-2012 18:41:45  
how big of a stroker crankshaft would fit in a 720 gas was a propane tractor converted

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jd b puller

12-20-2012 15:14:36

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 Re: need more 720 gas HP in reply to Lee DePew, 12-20-2012 15:05:37  
Lee, as far as I know it's the same as a G/70 as far as how much you CAN stroke it.

Stroke + journal = 13.375" I'm sure someone has gone bigger, that's worked for me.

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Lee DePew

12-20-2012 15:31:19

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 Re: need more 720 gas HP in reply to jd b puller, 12-20-2012 15:14:36  

thank you for the info greatly appreciated!!!!!

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