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720 Valve timing for a 60.....

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Ron

01-09-2002 06:02:48




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I would like to find a new cam for my 60...

I like the Valve timing of the Gas 720....

Anyone know where I can find one.???? Thank You...!!!

Ron.




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10-12-2004 06:13:11




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 Re: 720 Valve timing for a 60..... in reply to Ron, 01-09-2002 06:02:48  
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G Taylor

01-09-2002 06:59:16




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 Re: 720 Valve timing for a 60..... in reply to Ron, 01-09-2002 06:02:48  
The 60 runs with Intake 10 ATDC/40 ABDC & exhaust 45 BBDC/5 ATDC. The 720 spark ignition engines were intake 6 bTDC/26 aBDC & exhaust 20 bBDC/4 ATDC. 620's which were Deere's most fuel efficient two cylinder gas was also intake 10aTDC/40aBDC & exhaust 45bBDC/5aTDC. The 1947 & later B,50/520/530 used intake TDC/50aBDC & exhaust 55aBDC/5aTDC. A cam grinder such a Roberts will look at the entire combination of parts & the intended usage then grind a profile. Do you want peak HP at high rev's or max torque when lugged down?

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Ron

01-09-2002 17:11:07




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 Re: Re: 720 Valve timing for a 60..... in reply to G Taylor , 01-09-2002 06:59:16  
I want Max HP at 1,000RPM, and Max Torque at 750 to 800 RPM... This is a Working tractor..... 5 1/2" + .125...7.3 to 1 Compression... The 720 Gas has a much more aggressive set of valve-timings, and had a good reputation for pulling...much better than a stock "70", which always sounded "Lazy" to me, like the 60... Thank You for any suggestions..!!

Ron.



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Mike Aylward

01-09-2002 18:12:59




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 Re: Re: Re: 720 Valve timing for a 60..... in reply to Ron, 01-09-2002 17:11:07  
Ron, I am using a Robert's cam in my 60 puller. It works very well. I got to talk to Robert's cam grinder personally and told him what I wanted and he ground the cam to fit. He knows what he is doing and will ask a lot of questions of you. Very well pleased with the results. Hope this helps. Mike



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