dc case build

a dalton

Member
I am looking to build my DC case this winter to pull and wondering if anyone has any tips on what I should do as far as bore and stroke or cam grind i should use i am currently running a propain head with big valves all help would be greatly appreciated thanks
 
(quoted from post at 16:47:59 10/21/13) I am looking to build my DC case this winter to pull and wondering if anyone has any tips on what I should do as far as bore and stroke or cam grind i should use i am currently running a propain head with big valves all help would be greatly appreciated thanks
well how much do you want to spend and what class/rules do you want to run/have. generally speaking the DC case is a good puller but heavier
 
4.625 x 7 worked over 5576 head. Get the pistons up in the combustion chamber to get your compression. Brace the rear main in the block. A few things to think about. Mel and dboll are good people to talk to about a dc.
 
I agree with Gary, the DC will make great HP but the block has its limitations, we solved the rear main issues but the center main saddle will also pull out of the block as well. The 400 has a 5 main engine and vastly better gear selection. The big stroke big bore Case blocks are just now being developed by builders like Gary. Strokes of over 7" are the norm and the later engines can hold near 200 more cubes than a D series block.

Dollar for dollar the later engines just make more sense.

BTW, Doug is a great friend and we have no competetion between us, we share info via phone regularly and I have personally visited his place and seen his stable of tractors. Our associations back East here allow for more lax rules using speed limits rather than RPM limits which allow for some design differences. We just take advantage of the rules we are given to work under.

mEl
 
You said you fixed the rear
main problem what needs to
be done to fix it and is it
possible to turn my engine
4500 rpms with a stock
stroke and a 4.5 bore and
balance work
 
I have two 400 tractors that I should sell here in Nebraska. I always liked the look of them but I have way too many projects and kinda rooted into other colors. 308-940-0255 Jeff
 
what are you talking about? I have never pulled against any of Mel's tractors, It's a long from the MN/SD border to PA, Gary positively commented on mine once so I take that as a big compliment , did you get too much sour mothers milk as a child?
 
I"m turning 3000 rpm with a stock motor I don"t see why I couldn"t get 1500 more out of it with a lot of balance work and a good set of rods and cam
 
Get a trans-blanket, steel flywheel and aftermarket clutch and pressure plate (SFI recommended) and maybe a set of tie bars to tie the engine and rear end together. The engine's internal parts are a lot less likely to hurt/kill someone than if any portion of the flywheel assembly comes apart. 4500 rpm is roughly three times stock or nine times the stress the flywheel was designed for.
 
Let's say your flywheel comes apart and hurts or kills a bystander. Their family is going to sue the sled owner/operator, the property owner, the pull promoter, and you the tractor owner/driver. Do you have personal liability insurance that specifically covers tractor pulling? If not, 4500 rpm could cost you your house and some jail time. Sure it's worth it?
 
well since they make steel flywheels and clutch components, scatter blankets and tie bars you are really talking nonsense. I would think if 4500 rpms are your goals then you would consider those items part of the build process. Maybe in your little world nobody runs over stock rpm's but personally many tractors run over 3000 and don't come apart because they were built with this figure in mind.
 
just remember at 1200 rpm's the engine is under the rated rpm's for that engine at 1390 or above a sharp lawyer could exploit that fact, as for multiplying centrifical force doubling the rpm's quadruples it so if the formula holds true at 4500 it would be almost 16 times the force, if anyone wants to discuss the issues I had to overcome building a 4 5/8x6.5 I am always willing to talk but if someone wants to build a spinner please call someone else
 
I have to agree with gfs I already have a 1030 case that has a 504 engine in it turbocharged that is turning 5500 but it had the proper safety equipment to stand this many I have never fooled with smaller case and didn"t know the precautions I needed to take to do this
 

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