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Minneapolis Moline Tractors Discussion Forum
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How far to bore a 585?

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Mopower

09-29-2005 09:42:32




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How far can a 4.75" 585 engine be bored?




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Eric Prewitt

10-03-2005 00:19:07




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 Re: How far to bore a 585? in reply to Mopower, 09-29-2005 09:42:32  
If I were going to build this style tractor I would go with something like a 4.810" bore and 6" stroke with 605 Crank which you may need to get hardened to specs of the 585 crank for stability.This would put you at 654 cubic inches and @ 2000 RPM's would be a strong runner in MPH classes. Have built several on gas @ open RPM's and had no problem out of them.

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Old Puller

10-01-2005 18:16:50




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 Re: How far to bore a 585? in reply to Mopower, 09-29-2005 09:42:32  
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You need to talk to Dave Otto from St Thomas,Missouri.He has a good running G-1350 MM puller with a 640 cube 585.There are several good running MM's in his area and I'm sure hes had a hand in all of them.

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LW

10-01-2005 16:56:56




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 Re: How far to bore a 585? in reply to Mopower, 09-29-2005 09:42:32  
Ethan you might be able to use a Mack piston 4 7/8 bore thats a good diesel piston that might work out with some spacing or cutting here and there to get the deck height where you want it. I had some but just got rid of them may be able to come up with some more.



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mmnovice

09-30-2005 08:48:09




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 Re: How far to bore a 585? in reply to Mopower, 09-29-2005 09:42:32  
Depends on how far you want to go, Do you still want to run water through the blocks? Are you going to keep it on Diesel? Is It a puller or is it a farm tractor? What Kind of cubic inches are you looking for?



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Mopower

09-30-2005 08:51:39




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 Re: How far to bore a 585? in reply to mmnovice, 09-30-2005 08:48:09  
It is going to be a puller diesel with water in the blocks. Nothing radical except my crank and rod swap. I have an engine configuration figured out, but I didn"t know how much over 4.75 you could go without getting walls too thin for a diesel. You can bore a regular MM block 1/8" +.060 but I dunno in a 585.



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mmnovice

09-30-2005 09:10:33




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 Re: How far to bore a 585? in reply to Mopower, 09-30-2005 08:51:39  
You are on the right track. If you go much bigger than what you are talking about, you will get into moving the centers of the cylinders away from each other, therefore the need to fill the water jackets, not to mention recentering the journals on the crank, and the mess of clearencing everything. I assume you cannot run the 800 jugs? What are the rules for the class you are running?



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Mopower

09-30-2005 10:39:24




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 Re: How far to bore a 585? in reply to mmnovice, 09-30-2005 09:10:33  
Since I am building a GBD, it must stay diesel because a gasoline GB was 4cyl. Everyone else uses a 605 or HD800 for big open classes, but I am trying a 585. I don't plan on cranking RPM's, adding a turbo, or going wild, but a HD800 crank will create a 637 cube machine cranking 2000 RPM with a healthy rebuld should yield some good power for 6500# speed limit classes. I don't figure on much clearancing or recentering. It will be expensive enough to keep me turning wrenches for a while. Maybe it will surprise me, but I dunno.

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mmnovice

10-01-2005 07:16:31




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 Re: How far to bore a 585? in reply to Mopower, 09-30-2005 10:39:24  
That is a neat idea. have you considered the 605 crank. you can still get the same stroke, with the smaller journals, maybee saving you some rods or possibly reusing some rods you already have. It would basically be like putting a G crank in the 4cyl ub's and U's. Have you considered what heads you will run? The white 2-150 heads where top port injected, and from what I have heard where a better diesel head. Also, have you given any thought to a fuel pump yet? There is a class around my parts I would love to run with a G 950 that is diesel only but limited to a stock appearing pump. This class is 3000 rpm @ 650 cubes, and every thing I have heard anout the roosamaster says I can't feed a set up like that at those rpms. I do realize you said you where only going to run 2000 or so rpm, so I was just wondering.

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J. Schwiebert

10-02-2005 11:33:02




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 Re: How far to bore a 585? in reply to mmnovice, 10-01-2005 07:16:31  
Just reading this but the thought just struck me. Does the 605 have indusction hardened journals? If not and you run the engine as a diesel you are asking for problems! Alsoif you are thinking a DB Roosa how about a 4 plunger DC model? Like I said just thinking. Also where is piston clearance on a 585 piston measured?



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J. Schwiebert

10-02-2005 11:31:04




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 Re: How far to bore a 585? in reply to mmnovice, 10-01-2005 07:16:31  
Just reading this but the thought just struck me. Does the 605 have indusction hardened journals? If not and you run the engine as a diesel you are asking for problems!



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