î î î. block grants. categorical grant. commerce clause. cooperative federalism. devolution. elastic clause. federalism. line-item vote. mcculloch vs. maryland. necessary and proper clause. new deal. nullification. reapportionment. sovereign immunity. spending clause. supremacy clause. unfunded mandates.
The compression ratio is the ratio of the volume of the cylinder and the combustion chamber when the piston is at the bottom, and the volume of the combustion chamber when the piston is at the top. Automotive engineers can improve fuel efficiency and fuel economy by designing engines with high compression ratios.
The larger swept volume of a big-inch engine makes it all too easy to exceed the prudent limits on compression ratio. With nearly 70 cubic inches of piston displacement per cylinder in a 555ci Rat motor, itâs possible to squeeze out an 18:1 compression ratio with conventional big-block cylinder heads and pistons.