Basic engine nomenclature
(→Links) |
(→Links) |
||
| Line 30: | Line 30: | ||
STACK: The addition of 3 values to arrive at the STACK dimension of parts that you will fit into the cylinder block. PISTON COMPRESSION HEIGHT, rod center to center length and crankshaft RADIUS are added together to arrive at a STACK height. Generally speaking, a builder would want the total STACK dimension to be just short of the BLOCK DECK HEIGHT or exactly the same measurement as the BLOCK DECK HEIGHT, called "zero deck". Some builders have fitted a taller STACK into a block to allow the piston to come up out of the block slightly with the piston at top dead center. This might be done to adjust the squish when using a thicker head gasket, like maybe a 0.050" (fifty thousandths of an inch) thick or 0.060" (sixty thousandths of an inch) thick copper gasket with o-rings for a blower motor. If using domed, or pop-up pistons, the STACK is measured to the piston crown, NOT including the dome. Some pistons are manufactured with a COMPRESSION HEIGHT taller than a standard piston. This additional measurement needs to be taken into consideration when totalling the height of your STACK of parts. | STACK: The addition of 3 values to arrive at the STACK dimension of parts that you will fit into the cylinder block. PISTON COMPRESSION HEIGHT, rod center to center length and crankshaft RADIUS are added together to arrive at a STACK height. Generally speaking, a builder would want the total STACK dimension to be just short of the BLOCK DECK HEIGHT or exactly the same measurement as the BLOCK DECK HEIGHT, called "zero deck". Some builders have fitted a taller STACK into a block to allow the piston to come up out of the block slightly with the piston at top dead center. This might be done to adjust the squish when using a thicker head gasket, like maybe a 0.050" (fifty thousandths of an inch) thick or 0.060" (sixty thousandths of an inch) thick copper gasket with o-rings for a blower motor. If using domed, or pop-up pistons, the STACK is measured to the piston crown, NOT including the dome. Some pistons are manufactured with a COMPRESSION HEIGHT taller than a standard piston. This additional measurement needs to be taken into consideration when totalling the height of your STACK of parts. | ||
| − | |||
| − | BLOCK DECK HEIGHT: Measurement from the centerline of the main bearing bore of the block to the flat part of the block deck where the heads bolt on. Blueprint dimension of a Gen I small block Chevy is 9.025". Not to be confused with PISTON DECK HEIGHT, which is the measurement from the piston crown to the block deck with the piston at top dead center. BLOCK DECK HEIGHT is shown here, but is mis-labeled as simply "deck height". It should have been labeled "BLOCK DECK | + | |
| − | + | BLOCK DECK HEIGHT: Measurement from the centerline of the main bearing bore of the block to the flat part of the block deck where the heads bolt on. Blueprint dimension of a Gen I small block Chevy is 9.025". Not to be confused with PISTON DECK HEIGHT, which is the measurement from the piston crown to the block deck with the piston at top dead center. BLOCK DECK HEIGHT is shown here, but is mis-labeled as simply "deck height". It should have been labeled "BLOCK DECK HEIGH | |
PISTON: Pistons come in 3 flavors, cast aluminum, cast hypereutectic aluminum and forged aluminum. Hypereutectic means that there is a very large amount of silicon in the mix when the manufacturer casts the piston, which gives the piston a different set of operating characteristics over a conventional mix with a standard amount of silicon added to make a conventional cast piston. In addition to the obvious diameter measurement, there is a measurement of the centerline of the wrist pin to the crown of the piston. This measurement is called COMPRESSION HEIGHT.... OR CH for short. This diagram shows CH..... | PISTON: Pistons come in 3 flavors, cast aluminum, cast hypereutectic aluminum and forged aluminum. Hypereutectic means that there is a very large amount of silicon in the mix when the manufacturer casts the piston, which gives the piston a different set of operating characteristics over a conventional mix with a standard amount of silicon added to make a conventional cast piston. In addition to the obvious diameter measurement, there is a measurement of the centerline of the wrist pin to the crown of the piston. This measurement is called COMPRESSION HEIGHT.... OR CH for short. This diagram shows CH..... | ||
Your Privacy Choices