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Topic: JD A rpms?
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| clampdaddy
07-29-2012 21:42:06
50.8.151.226
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I'm just getting into pulling (pulled twice, got spanked both times) and starting to do little tweaks to my tractor here and there as money becomes available so I swapped the primary reduction gears in my '48 model A with a set from a '51 and I'd like to get a few more rpms out of my engine to get my ground speed back up. What's the best way to go about doing this but still keep the ability to kill the engine by pulling the throttle? One guy told me to bend the governor spring but I'd like some other opinions before I modify anything. Thanks |
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| Dodgeit
08-02-2012 11:21:27
65.199.61.227
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Re: JD A rpms? in reply to bobidan, 07-29-2012 21:42:06
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Be that as it may. 100 or so rpm's is not going to help you much, towards your goal. Getting the tires hooked and the weight in the right place will do more and be cheaper. Just saying. Just cause Deeres are handicapped in RPM doesn't mean you need it to win. A late "A" has 321 cubic inches stock vs 281 in a 450 Farmall for example. The "A" is also better balanced than the 450. If your not at least placing with an "A" vs Farmalls and others. You've got more problems than 1 or 2 hundred rpm's will fix.
I'm running a 251 CI Case that's is doing extremely well against 6cyl Olivers ond Cockshutt's, not to mention Farmall's of all sorts.
The secret to success is taking care of the small things first. Balance, Tires, Tire pressure, Hitch height and placement. Losing 2 psi in the rear tires took me from 3rd place finishes to first place in three classes last Saturday.
Just for reference I've pulled on three different dates for a total of 11 pulls and have four 3rds, one 2nd and five 1st place finishes. Never pulled before this year and only those 3 dates mentioned above.
I'm dang proud of my accomplishments, and took a lot of time to study what others were and weren't doing, before I even started on the brackets and hitch. At our local club, I always volunteer to be the flagman for the first part of the event. It allows great insight into track condition,how a winning tractor is set up, and where to take the sled when I pull. Winning takes more than a hopped up tractor.
Off my horse now. Have fun!! |
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| clampdaddy
08-01-2012 12:34:21
198.228.216.144
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Re: JD A rpms? in reply to clampdaddy, 07-29-2012 21:42:06
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If I ever join the local pullers club and beat anybody then someone might care enough to send me in for an inspection but since I don't belong to the club (or ever beat any of them) my pulls don't effect them. I just want to get the sled a little further down the track for the crowd. |
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| Dodgeit
08-01-2012 12:14:01
65.199.61.227
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Re: JD A rpms? in reply to Future Puller, 07-29-2012 21:42:06
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Most pulls allow 10% over stock, so 1200 is too high for an "A". |
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| clampdaddy
07-31-2012 19:09:03
50.8.151.226
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Re: JD A rpms? in reply to hotrod60, 07-29-2012 21:42:06
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| The Dukester said: (quoted from post at 01:28:20 08/01/12) One of my few tricks is to back the spring with a 3 inch long piece of 1 X !/8 HRS flat strap slotted on one end to fit on the bracket with the regular spring to stiffen it's "give" some....works good, peps up a "lazy" John Deere pretty good for me. |
Another excellent idea. Thanks! I like the idea of it being a bit adjustable.
How far should I consider going with the rpms on a basically stock motor? I was thinking around 1200.
This post was edited by clampdaddy at 19:12:22 07/31/12. |
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| The Dukester
07-31-2012 17:28:20
204.106.241.43
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Re: JD A rpms? in reply to clampdaddy, 07-29-2012 21:42:06
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| One of my few tricks is to back the spring with a 3 inch long piece of 1 X !/8 HRS flat strap slotted on one end to fit on the bracket with the regular spring to stiffen it's "give" some....works good, peps up a "lazy" John Deere pretty good for me. |
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| clampdaddy
07-30-2012 08:03:28
198.228.216.144
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Re: JD A rpms? in reply to 240 fan, 07-29-2012 21:42:06
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Thanks! I like that idea much better. |
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| Gary41a
07-30-2012 05:05:27
70.37.205.141
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Re: JD A rpms? in reply to clampdaddy, 07-29-2012 21:42:06
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| Find another governor spring and add it behind yours.A shorter spring works best. One from an A or B will bolt in the bracket with yours and will increase the pull on the governor,but will be the same at low throttle.Good Luck! Also might want to remove the cap on the air intake stack(punch loose rivits),and look down the intake stack for hornet nest mud. This will really cut down horsepower and can be cleaned with shop vac and bar to chip it loose. |
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