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Farmall & IHC Tractors Discussion Forum
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difference between pistons

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Charles McNelly

10-02-2005 16:46:28




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I would like to know the difference between the Stepped head pistons and Fire flow pistons. I contacted YT and they didn't know. Part #'s are PK154 and R2397. They fit a c113 engine. I know one is a pop up piston, what is the other? They don't list it as flat. Thanks for your input.




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gene bender

10-02-2005 17:21:42




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 Re: difference between pistons in reply to Charles McNelly III, 10-02-2005 16:46:28  
Cant they show a picture of the FIRE FLOW?That is probably a trade name. The stepehead ones would be o.k. Are you wanting max horsepower of just a gooe running engine. There are kits for 320 or so that would be fine.



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Charles McNelly III

10-02-2005 17:33:06




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 Re: difference between pistons in reply to gene bender, 10-02-2005 17:21:42  
MAX HP, the more ponies the better. I know the stepped head pistons are raised on one side flat on the other so they wouldn't hit the head. There is no picture for the Fireflow pistons. I had e mailed them but they didn't know. I was curious if one had higher compression.



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Janicholson

10-03-2005 11:43:43




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 Re: difference between pistons in reply to Charles McNelly III, 10-02-2005 17:33:06  
If you can have them in your hand, the way to check the compression boost is to use a beaker (with cc's or ml marked on the side). Put water in the beaker to the 200cc or ml mark. Put the piston crown into the water in the beaker until the water reaches the round top of the piston (the edges of the piston that remain in the cylinder when the engine is put together). Look at the amount the water rises in the beaker, and subtract it from the original level. Which ever piston has more crown displacement will give the highest compression. If you subtract the crown displacement from the total combustion chamber volume (Set the head flat and pour in water till the chamber is full, then measure water used), you get the assembled combustion chamber volume in CC's (with water 1CC=1ml=1gram). The displacement of the cylinder divided by the assembled combustion chamber volume gives compression ratio. (Area= PI times radius squared times the height of stroke --done using mm--)(all done in cc because it is easier and the way it is done even by hotrodders)There are 25.4 mm to the inch.
Stay below 8.5:1 if you want to use unleaded regular. If you are hunting the ultimate, or running pure alcohol or propane, higher numbers can be used.
I hope this helps some, don't be intimidated by numbers.
JimN

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Charles McNelly III

10-03-2005 15:25:45




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 Re: difference between pistons in reply to Janicholson, 10-03-2005 11:43:43  
Thanks for your input Jim, I'm fine with numbers, Sub Station Electrician by trade. I wish I could afford to buy both these sets, I only know the part #'s and have seen one pic of the stepped head pistons. YT didn't know what the difference was between the two. Thanks again.



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