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Minneapolis Moline Tractors Discussion Forum
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how to get big cube

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last place

08-09-2005 05:19:01




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How do you go about getting big cubic inches out of a 403 with out breaking the bank and making it compete with all the other ih,jd and oliver trastors. HELP!!!!! !!! Thanks!!!!! !!




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Mopower

08-09-2005 06:11:44




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 Re: how to get big cube in reply to last place, 08-09-2005 05:19:01  
Cubes? Well 800 blocks can be machined to work without heaps of expense, but they are not always legal. You can bore to 4.81 and run a seven inch stroke as well. Stroking costs money. Re working the block for 5.75 bore costs money too. What classes do you compete in? Compression and breathing are two big things that can be increased rather cheaply and yield good h.p. numbers.



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last place

08-09-2005 08:17:21




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 Re: how to get big cube in reply to Mopower, 08-09-2005 06:11:44  
I pull a U in farmstock and trying to get the bugs out. I would like to get it in the open classes and have pulled in open classes before but just dont have the power it takes to run a cut 16.9 or 18.4 tires and be able to compete with the others. I love pulling heavy classes in farmstock and sure I would in open and antique also.



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Mopower

08-09-2005 08:49:46




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 Re: how to get big cube in reply to last place, 08-09-2005 08:17:21  
To pull in open classes without a speed limit, you are going to have a hard time with a stock 403. I am assuming you pull 5500#, but you may try to get down to 4500# or 5000#. A 403 will be very competitive in even the quicker speed limit classes but not open classe with that big of a tire. Stroking costs money and big custom sleeved blocks cost even more. A bored 403 built right may make 125 h.p. tops.

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Jerry Cent. Mi.

08-09-2005 08:29:01




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 Re: how to get big cube in reply to last place, 08-09-2005 08:17:21  
A stock G with a well tuned 403 developes more horse power and torque the than most of the pre 1957 tractors but they are difficult to get down as far as 5500 lbs. and then the front is to heavy to compete below 6500 lbs. Just my thoughts. You need to get rid of the cast iron wheels and I hope that you have the disc brakes as the drums brakes are heavy.



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last place

08-09-2005 11:00:42




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 Re: how to get big cube in reply to Jerry Cent. Mi., 08-09-2005 08:29:01  
My 403 is in a U and I do pull it in #5500, #6000, #6500, #7500 and #8500 farmstock with 13.6-38 45 degree tires and it places 1st, 2nd or 3rd most of the time. I have pulled #5750, #6250 and #6750 in 2nd and 3rd gear on a very hard track but I have had problems chokeing in the heaver classes. Never choked in 1st gear. I would like to just be able to compete in only open or Antique classes or maby ony run in faster speed classes. THANKS!!!!! !!!!!

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Mopower

08-10-2005 07:18:46




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 Re: how to get big cube in reply to last place, 08-09-2005 11:00:42  
Sounds like you are doing well to start with. To get some more grunt, I would not eat it up by using more tire. Maybe 15.5 or 16.9 x38. By eliminating all hydraulics, generator, starter, cast centers, and extra brake pedal, you may be able to get in to 5000# class. I had a friend that ran a bored 403 in open classes and did pretty well, but he had to stay light. To get the most out of your 403 I would bore it to 4.81 with aluminum pistons. Add 10A4232/4231/4230 heads with some porting work and a Berry cam. A pierce governor is a good adition as well. The manifolds can be replaced with LP manifolds of an M5/M602/M670. You can crank 125 h.p. and beat a few I bet in hot classes.

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Andy2

08-09-2005 19:17:27




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 Re: how to get big cube in reply to last place, 08-09-2005 11:00:42  
Sounds like you're doing fine. It would take big dollars,(at least around here) to run open classes.



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last place

08-10-2005 08:08:36




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 Re: how to get big cube in reply to Andy2, 08-09-2005 19:17:27  
Thanks for all the help and advise it sound to me as I will have a prety good winter project if I can find all the parts. THANKS!!!!! !!!!!



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family tradition

08-09-2005 09:22:28




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 Re: how to get big cube in reply to Jerry Cent. Mi., 08-09-2005 08:29:01  
I have a UTS w/ 403 very high comp. custom built frontend and aftermarket disc brakes. I can pull it in 4500 w/ 16.9-38 deep treads. It is for sale in the classifieds if interested



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mo4xdadad

08-09-2005 15:06:49




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 Re: how to get big cube in reply to family tradition, 08-09-2005 09:22:28  
I can set you up just about anyway you want to go.
We have a 5500-7500# div 3-5 tractor for sale. Or we build about any combination of engine. We have had good luck with a 403 combination in the past, but they are not an open tractor combination.
You probably need at least 6.5" stroke by 5.5"bore to be in the hunt. That is with the latest technology, intake, ignition, timing, cam, and head\valvework done. Good luck on whatever you decide to do. Molines are tuff cookies wherever they hook.

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last place

08-09-2005 18:42:20




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 Re: how to get big cube in reply to mo4xdadad, 08-09-2005 15:06:49  
I dont know muck how horsepower I realy need to pull the lighter classes, I just want to compete and let them know that I was there.

Now sorta with the horsepower problem out of the way how about getting the tractor lighter.It's weight is about #5400 with me in the seat. The only thing that has been changed (other than the motor) is the front wheels are 5.00-15 on realy light steel wheels and I can rum with out a battery as I have a realy,realy hot mag.

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