Posted by Janicholson on April 30, 2013 at 17:35:03 from (74.60.94.18):
In Reply to: Pistons posted by WV Farmall on April 30, 2013 at 16:47:57:
The answer is the volume of the combustion chamber taken up by the piston crown is the determining factor. There are at least 4 differing Fire crater branded pistons, and fire dome pistons and high altitude pistons and stepped head pistons. It is almost all hype. If the piston has a projection into the combustion chamber, that projection takes up space. The amount of space taken up reduces the chamber volume, thus increasing the compression. So because of the name game above, the answer is that the piston with the biggest dome that doesn't hit the cylinder head or contact the valves when in operation will increase the HP the greatest amount. If the compression pressure is raised to above 160PSI, the use of 93 octane fuel and the reduction of maximum spark advance will be needed to avoid detonation. Pressures in the 150 PSI range are desirable. and with sleeves allowing bigger pistons one can get into the 70 hp area pretty easily. Jim
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