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Tractor Pulling Discussion Forum

Re: How much compression on jd a

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Kelly N

02-04-2013 14:56:11

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I think I may have given the impression that I'm not pleased by what I have done with my tractor by installing the flad head. ON THE CONTRARY! It makes gobs more power and Im pleased with my expendatures. Compression is ALWAYS more power. All I have is 'seat of the pants' dyno time, but i know it makes atleast twice the power it made in totally stock form.

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02-04-2013 15:54:56

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 Re: How much compression on jd a in reply to Kelly N, 02-04-2013 14:56:11  
At least twice as much power? Depending how worn the old bores and pistons were and the engine being way below rated HP and making perhapes 20HP. Then sure with round bores,minimal blowby and 11 to 1 compression instead of 5.6 to 1. Maybe 42 HP. Factory was 37HP.

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Kelly N

02-06-2013 12:46:19

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 Re: How much compression on jd a in reply to buickanddeere, 02-04-2013 15:54:56  
This is numbers taken from tests done on the old tractors way back when:::
(Drawbar power (max): 26.20 hp [19.5 kW] }

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Kelly N

02-06-2013 12:36:25

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 Re: How much compression on jd a in reply to buickanddeere, 02-04-2013 15:54:56  
It was the all fuel, 4 something to 1 compression motor and yes it was welll used. Now it has 125 over with the M&W style aluminum pistons and is probably close to 10 to 1 with the flat head. The bigger valves and the better ports help alot also. It would bogg down in the 4500 class pretty easy without spinning out. Now it doesnt bogg in the 5500 class and does spin out. Would use garbage fuel in the beginning but now needs 110 octain to pull. So, yep i'de say it is about 50hp or more with no sweat.

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