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Discussion Forum

Compression ratio (brought back)

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JD Puller

12-27-2002 09:38:03




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Okay lets clearify something, In the post's below about copression ratio, I was kind of insulted about the coment from Bob C. In the pulling club that I belong to in Colorado, We have restrictions and rules. Plus some of us dont have the funds to build a tractor that will spin oversized tires. In my opinion, A good pull consistes of pulling the sled down the track with out losing traction or power. I like my John Deere unstyled A to lug down to about 500 rmp and then let the tires start slipping. This is showing that you are getting maximum traction to power ratio. This is were more mass in the cylinders comes in handy at low rpms. think on it a bit and let me know what you think.

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TimC

12-28-2002 19:40:25




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 Re: compression ratio (brought back) in reply to JD Puller, 12-27-2002 09:38:03  
I think you missed the point. Your 2 cylinder was meant to lug ( that term open to private interpetation {spelling?} ). A 6 might do the same thing but sound differant so one might not think about a 77 oliver lugging in first gear at 3 mph turning 1200 rpm but a JD running 3mph in 1st gear at 500 rpm might be intrepeted as really lugging down hard.

Everyone should be living by the same Golden Rules. All clubs have rules. Money helps in some cases to achieve an advantage. After re-reading your post you guys are saying the exact same thing. You pull down the track (ignore the way the engine sounds) and you either full pull or spin or "slip" the tires.

For what its worth, more cylinder pressure = more power. Up to a point. You just have to figure what that point is.

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Andy

12-27-2002 15:34:00




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 Re: compression ratio (brought back) in reply to JD Puller, 12-27-2002 09:38:03  
That is true when there is a speed limit, but in some of the faster classes momentum and wheel speed is what I see getting them further down the track. If you can get the tractor weighted just right and keep up the rpm most of the time you will go farther. Thats what I see hapening around here. As far as comp ratio goes I asked A Performance engine builder and told him the application (tractor), and he said 10.1 would be a good ratio to try for and that depended on a lot of different things cam, fuel, timing, valve timing,ect they all had to be right to make it work. All in the name of good fun?

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CASEPOWER

12-27-2002 20:07:58




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 Re: Re: compression ratio (brought back) in reply to Andy, 12-27-2002 15:34:00  
I'm with Andy. The compression is just one of the many things that will help your tractor and getting all of them things to work together makes your tractor efficient. The more efficient the more HP and torque. Have you noticed that new small cube engines have more torque and HP then the old ones even at the same RPM. That is because of testing and good engineering. New engines use the cubes more wisely and that makes them more efficient. Am I making any sence??

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