how do i get the most HP

I have a DC case and a SC case, im willing to put different motors in them to become an open puller or use the same motors. what is the most HP i can get or is there a motor i could stick in them like a 830 case that would tear up the track. Im tired of all the MM and John deers, just wondered if there are any case pullers with any suggestions, thanks

For the DC you should talk to DC Tom Graverson; he's the expert at tuning original D series tractors for pulling.

Page mel on this board. He has done about all you can do to a DC motor. About the craziest idea I have heard is a guy going to put a 671 Detroit in an LA. Don

It is not easy with the CASE because not alot of them done. It will cost $$$$$. It is all about cubes. A good machine shop will help. It is all about bore and stroke. DCs are easier. Stroke the crank all you can and bore the block for the biggest sleeves that will fit that you can find pistons that work or have custom pistons made. I've heard the all fuel head 5576 works best with big bore.

I have built DC engines to 470 CID and they will make good power, however the crankshafts are weak and the blocks need reinforced or the rear main saddle will pull out of the block. I have been through the learning curve on these engine and have some of my customers have impressive winning percentages. BUT the transmission gear selections in the DC only allow for two pulling gears. On some tracks it is hard to pull 3rd gear in non speed limit classes so I consider 1st and 2nd practical gears for pulling and third where the track will allow. IMHO a 400-700 would be a better choice of where to spend your money, the possibility of a mid 600 CID 4 cyl engine is a reality and the crank has 5 mains instead of the DC's 3. The gear selection is more advantageous with the 8 speed and the tractor with some work can be gotten light. If you are into NATPA style pulling the DC engine cannot be made large in comparisom to the MM's. Our area has more speed limit pulls but not rpm limited so this plays into my engine design. However when our engines have pulled in midwest NATPA competetion power was not the issue, unfamiliarity with the track and missing the setup and weighting were our limiting factors and we are 3-4 hundred miles away and cannot be there week by week to polish our game on those tracks. But it is the idea of the competetion , meeting and fellowshipping with fellow pullers and enjoying the sport that is important and a good finish now and then is just icing on the cake. mEl

thanks for the info do you know the email or how i contact these guys?

i guess i dont know how to "page" anybody on here. im not that great with computers. does mel have and email?

thanks mel, if i was to go with a 400 or 700 what would be the hp i would be looking at if i got it in the mid 600 cubic inch. also is it posible to bolt that motor in my dc?

[email protected]. Tell him Tommy Railsback referred you. He has John Deere 4010 pistons in a DC.

I don't know how big a 4010 piston is but I doubt that it is 4 5/8 and that is my common bore for a DC block. Off the shelf pistons of ag design are WAY to heavy for any serious hp consideration. The laws of physics say that a moving object has inertia and it takes sheer hp to start and stop a heavy slug at the bottom and top of each stroke. That is why the engines are so much more responsive when even stockers are changed from cast to aluminum pistons, DC Tom is a friend and does a great job pulling and is a great ambassador for the sport and is a real asset representing Case, I just happen to build a engine patterned more toward the open classes in more like "brush pulls", not NATPA rpm controlled so our engine styles cannot be compared on a even steven basis. No, a DC engine is just that and the bolt pattern is not common to anything except some industrial C series that were equipped with a starter. I understand your want to use a tractor that you already have, I was just pointing out the obvious advantages of the later style transmissions. If you are going to spend the money to build a hot engine it makes a lot of sense to spend it on a more suitable tractor, we are having great sucess here with the DC4, disadvantages notwithstanding. HP on a 600 CID, I dunno, but can tell you that my 360 CID stock stroke engine design will make well over 100 hp on a pb400 M&W dyno. mEl

mEl,

Send me an e-mail. I'd like to talk to you.

Blackstack. My email is [email protected]. drop me a note with your phone number. I will be glad to do what I can for you. mEl

thanks mel, im thinking of going with the 700, like you said it has 5 mains instead of 3. I would love to have the 600 cid motor. I found a 700 close by but the guy want 4500. which is a little much but i will keep looking. when i find one i will get back in touch with u. thanks for all the info

im going to add you too to my email mel

You"re better off building a 730/830 gas. The blocks and heads are the same as a 700 but the head bolts are spaced wider allowing for a slightly larger bore. I"m in the process of building one right now. 598 cu. in. is easy without having to chop away at the block and cam much to get a good stroke. You could go another 50 cu. in. or so but I want some long term reliability and don"t want to live on the screaming edge.

Blackstack, you are correct and the engine I would build would be a 30 series block for the reasons you mentioned, the fact is that it will bolt directly into a 00 series tractor which is NATPA legal whereas the 30 series are to late for most assns. I don't thnk most associations would object to that combo and it would be hard to tell the difference without close inspection. Another reason that I would do the later tractor is the rpm limits, a DC has a hi idle of only 1380 and the 00 series would be close to 2000 rpm, couple that with the 600+ CID and you have a very potent combo. If you were allowed 800 COM rpm that really sweetens the pot!!!!!! There is just so much more potential with the later tractor and the work is the same. mEl

You took the words right out of my mouth. Did you read my e-mail?