Case 970 puller August 02, 2018 02:57AM
Hi I have I couple of questions about a 970 case with a straight 8 trans, I’d like to build pulling tractor, the class is modified farm, 3000rpm limit, turbo size limits, no water, anyways I won’t gontoo into detail, but I was wondering if swapping out the 401 with a large journal 504 would be better? If I kept the 401 I would run 8000lb class with 410 ci limit, but i haven’t heard of many people using the 401 motor, I’ve heard the pencil injectors aren’t the greatest, anyone have experience with the 401?. But if I went with the 504 I would run 10,500, my only concerns are will 10,500lbs be a lot of stress on the rearend or transmission? And with a ci limit of 540 anything over 475 has to run a turbo measuring 2 5/8” on intake and 3” exhaust, anything under is 2 3/4” and 3.5”, with the 504 having lots of cubes, will it still be a competitive tractor with a smaller turbo?
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Re: Case 970 puller August 02, 2018 05:04AM
Not sure what your budget is or how much work you are capable of doing yourself or time line. But our most recent experience with a Case with "similar" limits would lead me to suggest using the 504. The larger bore will allow the use of the big injector heads and would be beneficial for better airflow and the bigger injectors. Would invest in a good ground cam. Recommend a Jeff Suits grind. A quality injection pump that is capable of 520ish of fuel along with good pusher/lift pump. At 3000 rpm you should be able to turn a S400 or HX60 base turbo but definitely a S300 or HX55. I would also put the 1175 range gear in to give you an extra gear to pull in. Have been running a 970 with the 8 speed at 12k for 3 seasons with no issues. You should be competitive with this set up.
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Re: Case 970 puller August 03, 2018 04:11AM
Thanks for the input, i knew the 504 could take bigger heads and injectors but I wasn’t sure if the rear end would hold or if the turbo limits would hold it back. Any idea what hp it’d be at?
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Re: Case 970 puller August 03, 2018 04:41AM
Wondering where to get a clutch for a build like this? Is a large journal engine necessary for reliability or would a 2290 engine work?
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Re: Case 970 puller August 03, 2018 05:00AM
I can’t help you with th clutch, but it really sounds like large is the way to go, I also believe a 2290 not only had smaller crank but has a smaller volume oil pump, the 23 and 2590’s have large crank high volume pump and piston oil spray, later year 1370 504 is the same as 23 and 25 as well as 1570 2470 2670 44 and 4690, I’ve heard those are the motors you want. I’ve seen a couple of 2290 pulling motors for sale that say weak bottom end. Might be confusing but I hope that helps you.
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Re: Case 970 puller February 05, 2022 04:00AM
can i put the engine from a case 970 into a case 2090
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Re: Case 970 puller February 05, 2022 07:12AM
Yes
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Re: Case 970 puller August 03, 2018 05:58AM
Karl at Atlas Tractor 651-428-4563
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Re: Case 970 puller August 04, 2018 06:25AM
you need the 2390 bottom end and the heads off of 2090 or 2290 or the industrial head. their valve angle is 45 degrees compared to 30 degrees on the large journal engine. you can take the heads to a good shop and have valves and seats changed in them to 45 degrees and they will be fine.
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Re: Case 970 puller August 04, 2018 05:04PM
?? how can one identifie witch heads and block I have on without tearing it down, whats the casting no. or ? thks
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Re: Case 970 puller August 08, 2018 07:19AM
Ok so how would a 870 8speed be to build into a hot farm tractor? 3*3 charger 466 cube As a comparison, IH guys running 466 3*3 P pumps are running road gear + 20.8*38. Would I be better off with 451 or decubing a 504? Thank you in advance.
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Re: Case 970 puller August 08, 2018 09:09AM
My opinion based on past experiences, the rear end and transmission would recommend as above. It is capable of withstanding that HP. My choice would be de-cubing the 504. A lot of people will consider it counter intuitive but the larger bore will allow the heads to breath and would de-stroke the crank and use the 451 rods on the 504 crank. They are a longer rod with a slightly smaller journal size. Still all Case part numbers to use, etc,. I would again recommend a Suits cam. Some people will say that the short stroke won't make torque, blah, blah, blah but I think the extra air flow pays off more than the longer stroke. JMO.
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Re: Case 970 puller August 08, 2018 10:52AM
I have a complete 870 rear end assembly with the platform,also have the front end with the radiator. No sheet metal though.
$1300.00 715-308-2163
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Re: Case 970 puller August 08, 2018 01:10PM
Anon case puller, thanks for the input,. So an 870 8spd rear end trans will be strong enough? I see the ring and pinion is 9*48 teeth making it 5.33to 1. Can any one give me other ring and pinion counts and final drive ratios? I will be have a service manual tomorrow so hopefully between parts and service manuals I can find all the teeth counts. TIA also I Agree on big bore in shrouding valves and more air!
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Re: Case 970 puller August 09, 2018 03:18AM
There is a 10*48 and 11*48 R&P available as well. There is only one bull gear and pinion count but can't remember what is off the top of my head. If you put the 1175 range set in the transmission with the 9*48 will give you a decent selection for something that would be in the 600hp range. If you are looking at the 3x3 and p-pump, if done correctly with some good head work and recommended cam, you are going to be sniffing at 900-1000 hp (with out water). I would look for the 10 or 11 tooth pinions sets. It will put your selection up into the 20-21:1 range or faster and you will be able to turn that with 20.8's.
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Re: Case 970 puller August 09, 2018 09:44PM
Bull gear ratio is 4.67. 870 rear only had 3 spider gears I believe, 970 has 4. Other then that mostly the same. Bell housing is longer in the 870 so I'm not sure how that will affect your sheet metal once you attach a 6 cylinder to it.
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