Posted by Mark - IN. on December 02, 2013 at 21:37:25 from (50.121.21.253):
In Reply to: pistons posted by Bud keaton on December 02, 2013 at 16:08:41:
As Jim mentioned, domed pistons fill in the area fo the head's combustion chamber and increase the compression level. Flat tops don't lower compression ratios. Dished pistons, and they do exist, really lower compression ratios.
You have to be careful matching cranks, rods, pistons, cams, rocker arms, lifters. Figure that anything internal to an engine that moves needs to be matched, or complimentory of other components. Matching them may need to result in machining. The longer the rod throw, the closer to the head the piston dome gets and may require shaving the block for clearence. The longer the rod, the closer to the head the piston dome gets to the head. The higher the cam lift, the closer to the piston dome the valve face gets. Different rocker arm ratios will affect valve lift as well. All, or any of this may affect the clearances between the piston domes and the faces of the valves, which often requires the need to machine the piston domes for clearance. Higher compression ratios may require more heavy duty components such as connecting rods. Decking an engine block or heads to insure truing will affect a compression ratio and clearences.
You didn't mention your intended application. Field tractor? Garden tractor? Automotive? What is your intended desire or goal? There are all kinds of manufacturers of engine components, depending on the engine. There are all kinds of complete engine kits that might or might not require additional machining depending on the engine and intended application.
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