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High altitude pistons

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farmuse

03-04-2002 17:14:22




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Can someone tell me the difference between a standard piston and a high altitude piston? Were the compression ratio's different at high altitude? Are the shape of the piston tops any different? What gives?




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Ron

03-05-2002 12:22:21




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 Re: High altitude pistons in reply to farmuse, 03-04-2002 17:14:22  
Where is the Best place to find high quality High Altitude Pistons for a "520", and a "60"..???

Wow.!! I always wondered why I had to open the "petcocks" on my '52 "B" w/ +.180 High Altitude Pistons.!! It does pull one gear higher than the other identical one...!! Grandpa used to say I had to " Tickle it's Belly" to start it...!!!!



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ChuckW

03-05-2002 09:28:02




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 Re: High altitude pistons in reply to farmuse, 03-04-2002 17:14:22  
I put a set in a 620 and the combustion area was smaller, everything else was the same....on a 520/530 what is being sold as hi altitude seems to be flat top which I believe is LP type.



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Ron B.

03-04-2002 18:28:19




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 Re: High altitude pistons in reply to farmuse, 03-04-2002 17:14:22  
I'm only familiar with the late model A & B and 720 but assume what I have to offer holds true for other years and models. The high altitude piston is approx. 1/4" longer than the standard piston. The longer piston compensates for the lower atmospheric pressure at higher altitudes giving approx. the same compression ratio and horse power as the tractors with standard pistons at lower altitudes.



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farmuse

03-04-2002 18:45:59




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 Re: Re: High altitude pistons in reply to Ron B., 03-04-2002 18:28:19  
Does this mean they are a quarter longer from pin center to piston top?



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Ron B.

03-04-2002 18:57:53




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 Re: Re: Re: High altitude pistons in reply to farmuse, 03-04-2002 18:45:59  
Yes



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farmuse

03-04-2002 19:13:56




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 Re: Re: Re: Re: High altitude pistons in reply to Ron B., 03-04-2002 18:57:53  
How much would these raise compression ratio in low altitude? any idea



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Ron B.

03-04-2002 20:20:10




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 Re: Re: Re: Re: Re: High altitude pistons in reply to farmuse, 03-04-2002 19:13:56  
I don't have a clue how much it would raise the compression ratio. Hope someone else has the numbers for you. I might be able to calculate an approximate value if I knew what your cylinder bore diameter and compression ratio is.



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farmuse

03-05-2002 05:42:20




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 Re: Re: Re: Re: Re: Re: High altitude pistons in reply to Ron B., 03-04-2002 20:20:10  
Original bore is 4-11/16 stroke is 5 1/2 gas compression is 6.1 original displacement is 190.4 C.I.



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Ron B.

03-05-2002 18:05:53




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 Re: Re: Re: Re: Re: Re: Re: High altitude pistons in reply to farmuse, 03-05-2002 05:42:20  
My calculation indicates that you would increase your compression ratio to approx. 7.6:1



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phil

03-05-2002 07:58:35




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 Re: Re: Re: Re: Re: Re: Re: High altitude pistons in reply to farmuse, 03-05-2002 05:42:20  
farmuse, if your stroke is now 5.5" & your compression is now 6:1, then it will be 8.25:1 if you decrease the combustion chamber height by 1/4".



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