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dc case
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jerry m3
08-19-2010 12:25:17
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wanting to re do my dc motor like to have a little more power maybe 70 hp would it live in the feild at much Jerry
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jerry m3
08-20-2010 14:45:29
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Re: dc case in reply to jerry m3, 08-19-2010 12:25:17
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thanks for the replay from all of you just would like to give a little more mel what is reasonable Jerry
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mEl
08-21-2010 05:27:14
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Re: dc case in reply to jerry m3, 08-20-2010 14:45:29
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Ron SA is right on both counts about the cooling and durability aspects. I built one for a puller that does get into the 70 HP range. It has a special grind on the cam and much increased compression but only 285 cubes. HP is only one aspect of a DC. The torque increase that gives you even 55 hp is something you can really feel in the seat of your pants. mEl
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Don Rudolph
08-19-2010 18:27:23
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Re: dc case in reply to jerry m3, 08-19-2010 12:25:17
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Also, bear in mind this is a 3 main bearing block. At high HP the rear main bearing web will crack. Mel can probably tell you how to reinforce that area.
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mEl
08-20-2010 04:35:02
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Re: dc case in reply to Don Rudolph, 08-19-2010 18:27:23
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yes, the rear saddle will pull out of the block in hi hp alpplications and the cranks are suspect especially if the engines are lugged as they like to do. We have a stock stroke DC engine with the rear saddle supported and all is well so far at better than 120 hp on a M&W dyno at 1400 engine rpm. mEl
This post was edited by mEl at 04:36:07 08/20/10.
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Ron Sa
08-19-2010 18:22:38
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Re: dc case in reply to jerry m3, 08-19-2010 12:25:17
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70 hp is not a reasonable goal. 52-55 is reasonable. Even at 55 the cooling system is marginal. For 52-55 hp, you will need 4" pistons, cold manifold, and high compression head #5505A. The rpm will need to be increased from rated 1200 to about 1500. The later 830 had about 3% more cubes than the 4" pistons and ran 1900. It was rated about 65 hp. The DC rod bearings are babbit and no oil cooler so it is not a great engine for souping up and doing field work with. The 830 engine was made of better stuff.
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