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John Deere Tractors Discussion Forum

John Deere Aluminum OS Pistons

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Andy Motteberg

03-27-2007 20:23:30

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This is kind of a stupid question, but I was just wondering something about over size aluminum John Deere A pistons. Most of the time, you can buy pistons in the sizes Standard, .045, .090 and .125. Is there much difference between these pistons? Do some give more power? If they do, is it much more power? They usually all cost the same price, but rings for the .045 pistons cost much more than the others??? Thanks.

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Duane Larson

03-27-2007 20:39:32

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Re: John Deere Aluminum OS Pistons in reply to Andy Motteberg, 03-27-2007 20:23:30

Andy,
If you only change the diameter of the piston, and not its length (so the compression stays the same), and if you assume the hp is proportional to the cylinder volume (which may not be a good assumption), the volume increase is the square of the ratio of the two cylinder radii. For example, comparing a 5.5" standard bore to a 0.090 over bore, the increase is the square of the ratio 5.59/5.50, or about 3.3%. So, that is not a very efficient way to get hp increase. Normally the best way to get an increase in horsepower would be a combination of an oversize piston which is longer than the normal piston, thus also raising the compression ratio.

If you went to a Power Block, for instance, the quoted increase in horsepower is 18-23. For an A Power Block the piston diameter increases to 6.0" and the compression ratio increases to 6.5-1 for gas pistons and 8-1 for LP pistons.

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Andy Motteberg

03-27-2007 20:44:33

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Re: John Deere Aluminum OS Pistons in reply to Duane Larson, 03-27-2007 20:39:32

Thanks.

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