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Boring B block

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joel harris

10-13-2003 08:17:00

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Hello, I have a 46 B block that needs bored out. Are .045" over pistons still available from deere? I have checked the parts listing on this site and they only make the pistons for the 4 11/16" bore. My engine has the 4.5" bore. Is it safe to bore my block 3/16"(.187") and use the later model pistons? Also my engine was an all fuel model and has the flat top pistons, will there be a big difference in power by using the higher compression pistons? We plan on using this tractor for work so any modifications must be durable. Thanks for you help.

Joel

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Ron

10-13-2003 20:54:56

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Re: Boring B block in reply to joel harris, 10-13-2003 08:17:00

If you do get new pistons, and are planning to use the B for real work, I would definitly use the higher compression gas pistons.. You WILL have a lot more power..!! I have an "All-Fuel" 60, and my 1952 "B" (with +.180" gas pistons) will out work the 60 anywhere..!! SO...am going to sell the all-fuel 60..!!! Not sure about if you can bore to 4 11/16", but believe you can.... Should give you about 25 Horse power at the drawbar...27.5 at the pulley... That is a Large increase over the All-Fuel..!! Not far from the power of a "50"..!!

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Adam B.

10-14-2003 00:17:15

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Re: Re: Boring B block in reply to Ron, 10-13-2003 20:54:56

I'm finishing up my '39 B. The previous owner had it bored to 4-11/16" at some time, which I found out when I had the block inspected. The block was resleeved for those pistons. We cleaned up the pistons and I have new rings for them. I picked up a Power Block (5" bore), but have had trouble tracking down pistons for it. It seems the only pistons I may be able to get for the Power Block are 5.125". That would be fine, but there don't seem to be any available from the sources I tracked down. The only sure place was a custom engine shop for pullers, that will make any piston based on any part, blueprint or specs I can provide. Unfortunately, that kind of custom job costs more than I'm willing to part with at this time (rightly so, considering its a one-time job being made from scratch). I plan to use the pistons and block that were with the tractor when I got it, and perhaps track down pistons and repower with the Power Block at a later time. You should have no problem getting your block set up for the later size pistons.

I've seen an early '40s B that's making over 50 hp with mods to increase the compression. Its naturally aspirated, and has the stock crank (no stroker conversion). It does have to eat something like 127 octane to keep detonation under control. (I would guess he's running a 14:1 or 16:1 compression ratio.) The stock manifold had to be replaced with a custom-built one because it couldn't move exhaust adequately and would turn cherry red after a minute or two of running. Anyway, yes, getting the compression ratio up will give you more power. The all-fuel models actually had a lower compression ratio than gas versions by design.

Good luck! I hope to finish mine up this winter too.

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ChuckW

10-13-2003 08:56:41

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Re: Boring B block in reply to joel harris, 10-13-2003 08:17:00

personally have never had much luck with boring and new pistons/rings. Have had much better luck with just new rings. If you bore to aftermarket pistons, I would suggest that you allow plenty of clearance for expansion as the new aluminum pistons will expand more rapid than the cast iron originals. From my knowledge most all of those older tractors were fuel burners. You may be able to bore to the late model size and use cast gas JD pistons. This would be my suggestion. The firing is still in the cylinder and I believe that the pistons would interchange. My first recommendation would be to cleanup cylinder and re ring.

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