Re: difference between pistons

Posted by Janicholson on October 03, 2005 at 11:43:43 from (199.17.6.175):

In Reply to: Re: difference between pistons posted by Charles McNelly III on October 02, 2005 at 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

Follow Ups:

• Re: difference between pistons Charles McNelly III 15:25:45 10/03/05 (0)

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