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Old 09-08-2012, 06:50 PM   #1
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Default 750 brute with 650 crank?

I have a 750 brute and my rods seized on my crank. I have a good 650 crank sitting in the shop. I was thinking of using the crank out the 650 in my 750. It should drop me to a 715. I need a quick cheap fix. Hunting season just started and i need my brute. What do you think? should i try this or not?
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Old 09-09-2012, 06:17 AM   #2
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the 650 has a 3mm shorter stroke, would probly work ,but you will lose preformance
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Old 09-09-2012, 07:04 AM   #3
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It will work as long as you have the 650 rods, its should ge a really quick reving 715
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Old 09-09-2012, 02:17 PM   #4
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Okay school me here.

If there is 3mm shorter stroke, you lose significant compression on power stroke if you only change the crankshaft. Even with the 650 rods you end up with a larger combustion chamber space which in turn will result in a huge power loss. I honestly don't think it would work. It might run but really bad.

Am I missing something?
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Old 09-09-2012, 03:43 PM   #5
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The 650 stroke is 3mm more 1.5 mm offset. The 650 rods are 1.5 mm longer so you get the same deck hight. The combustion chamber stays the same but compression ratio will drop a small amount from the shorter stroke
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Old 09-09-2012, 05:26 PM   #6
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Quote: Originally Posted by reds650 View Post
The 650 stroke is 3mm more 1.5 mm offset. The 650 rods are 1.5 mm longer so you get the same deck hight. The combustion chamber stays the same but compression ratio will drop a small amount from the shorter stroke
Wow! It took me a while to figure out what you meant. I thought the earlier post said the 650 stroke was shorter. I get it now. Actually this combination if the deck height is the same should result in a higher reving engine. Is there any issue with a difference in piston skirt length? With the shorter stroke could be an interference there if they changed the skirt on the pistons.

Otherwise from what you said here, it could be an interesting combination. I don't think it will result in a compression drop if the deck height is the same. Really only loose the total CC's of the shorter stroke.
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Old 09-09-2012, 05:48 PM   #7
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No issue with skirt legnth at all, the longer rods make up the difference, any combination of piston and crank will work if it has the proper connecting rods. I built s 650, stock pistons with a 700 crank, worked out to a 662 i think. The prairie that im running now has a 650 crank with 83mm, Pistons making it a 682 and it works great...just need some better cams
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Old 09-09-2012, 06:29 PM   #8
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I meant to say the 750 is 3mm longer not the 650
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Old 09-10-2012, 07:19 PM   #9
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Im going to go ahead and build this motor with the 650 crank and rods but i am going to run a higher compression piston.
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