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John Deere Tractors Discussion Forum
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B with 50 pistons

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RBolig

12-16-2020 12:47:33




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I recently bought back my dad's 43 B that he sold many moons ago, and the guy I bought it from said he added a Heisler head and cast 50 pistons.

I still need to pull the valve cove to confirm Heisler is in fact in play.

My question is: why use a 50 piston? What's the benefit?
I am assuming it is just bore size, so why not just use a larger B piston?




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notyalc

12-20-2020 01:46:00




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 Re: B with 50 pistons in reply to RBolig, 12-16-2020 12:47:33  
Probably still got the original pistons in....



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DGK

12-17-2020 06:44:02




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 Re: B with 50 pistons in reply to RBolig, 12-16-2020 12:47:33  
I have any late model B or. 50 power block with pistons but block needs sleeved. Would sell cheap. PM me if interested. Thanks DOUG



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buickanddeere

12-16-2020 19:42:43




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 Re: B with 50 pistons in reply to RBolig, 12-16-2020 12:47:33  
Are those LP 50 pistons for more compression ?



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Loosehandle

12-16-2020 13:48:49




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 Re: B with 50 pistons in reply to RBolig, 12-16-2020 12:47:33  
There was a time when oversized pistons were NA for 4.5" B. Not sure about now,I have one that was sleeved.



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Randy G

12-16-2020 13:45:53




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 Re: B with 50 pistons in reply to RBolig, 12-16-2020 12:47:33  
I believe the 50 pistons also used rod insert bearings and the late B did not



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WTW

12-16-2020 13:17:15




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 Re: B with 50 pistons in reply to RBolig, 12-16-2020 12:47:33  
The 1943 B would of had 4.5 inch bore / pistons. The late B gas and 50 both had same larger 4 11/16" bore pistons. Only difference between the late B and 50 pistons was the 50 used a narrower / thinner piston ring. The later piston not only larger in diameter it was taller both raising compression. If you post a picture of the upper corner of cylinder head where valve cover meets head I can tell you if you have a Heisler head or not with out removing valve cover. The two alteration should raise compression between 8 and 9 to 1. DW

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RBolig

12-16-2020 14:12:47




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 Re: B with 50 pistons in reply to WTW, 12-16-2020 13:17:15  
DW, thanks for the reply. Here are two images of the head.



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WTW

12-16-2020 15:56:01




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 Re: B with 50 pistons in reply to RBolig, 12-16-2020 14:12:47  
This head in photo is not a Heisler. This head appears to be late model Stock B head. Sorry, DW



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RBolig

12-16-2020 19:46:24




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 Re: B with 50 pistons in reply to WTW, 12-16-2020 15:56:01  
Thanks for getting back to me.

If I were to consider a stock-head swap, is there one PN that is a better starting point than another?



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WTW

12-17-2020 07:52:41




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 Re: B with 50 pistons in reply to RBolig, 12-16-2020 19:46:24  
Mike said it all, no real gain between the later heads just a few casting changes. DW



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Mike M

12-17-2020 05:06:14




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 Re: B with 50 pistons in reply to RBolig, 12-16-2020 19:46:24  
The B cyl heads were all basically the same from 1942 ? and all the way to the end of production. I think there were 3 different casting numbers. The latest versions did away with the push rod tubes and had a different oil return passage that requires the matching thick cast washer on the center stud that feeds oil pressure up to the rocker arms.



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