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John Deere Tractors Discussion Forum
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70 pistons in A block

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johndeereboy

01-29-2006 06:09:09




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Has anyone heard of boring out an A block from 5 1/2 to 5 7/8 to hold 70 pistons. I guess what I am asking is will an A block hold up to being bored .375 over.




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Lynard

01-30-2006 17:16:26




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 Re: 70 pistons in A block in reply to johndeereboy, 01-29-2006 06:09:09  
johndeereboy I have been running one in an unstyled A that I pull for 8 years and it is still going as strong as when it first started running. 70 pistons are a lot shorter but mine is stroked 2 inches and welded rods are longer than stock. If you try and run the pistons higher in the block without stroking top ring grooves will go past plugs. Lynn



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Drew

01-29-2006 09:01:54




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 Re: 70 pistons in A block in reply to johndeereboy, 01-29-2006 06:09:09  
It can be done, if you have a GOOOOO OOOOD block. On the other hand, I have hit water at +.125". Like B&D said, get it sonic checked, but it is still possible that you will find a casting flaw/tiny pin hole. Most, if not all of the 5.875" A's I have heard of are unstyled, supposedly the bores are cast thicker, dont know how true that is though.



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Maark

01-29-2006 08:47:51




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 Re: 70 pistons in A block in reply to johndeereboy, 01-29-2006 06:09:09  
Isn't the 70 piston shorter than the A piston or pin location different, thus resulting in a shorter stroke?



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G/MAN

01-30-2006 10:33:36




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 Re: 70 pistons in A block in reply to Maark, 01-29-2006 08:47:51  
Stroke is controlled by the crankshaft. Changing pistons has no effect on the actual stroke, but as buickanddeere said, it will affect the compression height and compression ratio.



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buickanddeere

01-29-2006 17:52:09




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 Re: 70 pistons in A block in reply to Maark, 01-29-2006 08:47:51  
Stroke is the same, compression height would change.



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buickanddeere

01-29-2006 06:37:06




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 Re: 70 pistons in A block in reply to johndeereboy, 01-29-2006 06:09:09  
A well equiped machine shop can sonic test the block wall thickness. No use spending your money to have water cooled pistons.



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