09:39:18am, Thursday, April 18, 2024
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6.7 Cummins block 5.9 crank
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What's the cubic in for a 6.7 block 5.9 crank . What parts from a 5.9 can be used for this combo any one run this combination ?12 valve head p pump 3500 rpm |
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Re: 6.7 Cummins block 5.9 crank
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Registered: 09/25/2016 Posts: 10 |
Std bore 6.7 is 4.210" and 5.9 stroke is 4.72" netting 394 cubic inches. Works pretty good and allows room for big valves. |
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Re: 6.7 Cummins block 5.9 crank
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Pistons
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Wouldn't you need custom pistons though? The 6.7 piston wouldn't come to the top of the deck with a shorter stroke? |
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Re: 6.7 Cummins block 5.9 crank
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Registered: 09/25/2016 Posts: 10 |
Several ways to do it. Taller Pistons, longer rods, or deck the block...somehow you have to make up 0.080" |
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Re: 6.7 Cummins block 5.9 crank
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Registered: 09/25/2016 Posts: 10 |
Are you allowed to decube? Most of the light hot farms don't allow this. Personally I would use 5.9 bore and block and have crank stroked to 5.25" and be right at 399". |
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Re: 6.7 Cummins block 5.9 crank
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Registered: 08/02/2008 Posts: 236 |
Carrillo makes billet rods .080 longer for this purpose. |
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Re: 6.7 Cummins block 5.9 crank
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lewis
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The rules have been revised to allow a 1 present tolerance on the 399 to allow the 401 ford and case engines in here in ky |
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Re: 6.7 Cummins block 5.9 crank
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Ky fan
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They should have went with a 410 and 470 rule so naturally those tractors could move up to llss, but like most things in pulling that probably made to much sense |
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Re: 6.7 Cummins block 5.9 crank
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400"
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What's the easiest and cheapest way to get to 400" or as close as using a 5.9 block? |
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Re: 6.7 Cummins block 5.9 crank
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Lewis
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Use the 6.7 its not over cubed |
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Re: 6.7 Cummins block 5.9 crank
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Lewis
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correction its to big I was thinking of something else you may just try the 5.9 as it is if your not wanting to spend a lot of cash but befor I gave a thousand for a 6.7 crank I would give coronets a 1000 to stroke what I have to 5.25 like 27 cummins said and then you should have a lot better torque to work with that 3500 rpm |
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Re: 6.7 Cummins block 5.9 crank
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400"
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I like the idea of the long stroke, then just add a 0.530" deck plate and get longer rods? I don't suppose there is a way to bore out a 5.9 to fit 6.7 pistons without reducing the wall thickness too much, is there even enough material to bore it out for liners to use the 6.7 pistons? |
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Re: 6.7 Cummins block 5.9 crank
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Registered: 09/25/2016 Posts: 10 |
Yes there is room but it is too thin. Would be better off getting a 6.7 if you wanted to go that route. If money wasn't an issue and it allowed a deck plate, sleeves and rods would be the way to go. Also whike stroke would increase from 4.72" to 5.25" you only have to make up 0.265". I would just get a set of Pistons built. |
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Re: 6.7 Cummins block 5.9 crank
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Lewis
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Just add the deck plate you wouldn't need the longer rods I had a 1/4 inch thick copper head gasket made once it worked great a deck plate wouldn't cost much use the stock rods and pistons |
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Re: 6.7 Cummins block 5.9 crank
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400"
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Thanks for the help guys. Will a 5.25" crank turn in the block ok or will I need to grind a lot out of the crankcase? |
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Re: 6.7 Cummins block 5.9 crank
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Lewis
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I dont think you will have much of a problem . You could also offset grind the crank to a smaller journal I ran a set of deutz rods in one that I built with a 2 1/2 inch rod journal |
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