jaguar
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I just measured my squish band to be 30% whereas Eric Gorr would say a KDX needs more like 50% since its basically an upper mid-range bike. (area=3.14 x radius) My bike is the int'l SR model. I'd like to know what the squish area is on a regular KDX. ?
from http://www.ericgorr.com/twostktech/egportweb.html :
Cylinder-head shape also affects the powerband. Generally speaking, a cylinder head with a small-diameter, deep combustion chamber and a wide squish band combined with a high compression ratio is suited for low-end and midrange power. A cylinder head with a wide, shallow chamber and a narrow squish band and a lower compression ratio is suited for high-rpm power.
from http://www.ericgorr.com/techarticles/basic_two_stroke.html :
Cylinder heads can be reshaped to change the power band. Generally speaking, a cylinder head with a small diameter and deep combustion chamber, and a wide squish band (60% of the bore area). Combined with a compression ratio of 9 to 1 is ideally suited for low to mid range power. A cylinder head with a wide shallow chamber and a narrow squish band (35-45% of bore area) and a compression ratio of 8 to 1, is ideally suited for high rpm power.
How to figure squish area:
A=3.14x(1/2 diameter)
A=103 for KDX200 that has std 66mm bore
B=3.14x(1/2 diameter of inner squish band circle)
A-B=squish area
from http://www.ericgorr.com/twostktech/egportweb.html :
Cylinder-head shape also affects the powerband. Generally speaking, a cylinder head with a small-diameter, deep combustion chamber and a wide squish band combined with a high compression ratio is suited for low-end and midrange power. A cylinder head with a wide, shallow chamber and a narrow squish band and a lower compression ratio is suited for high-rpm power.
from http://www.ericgorr.com/techarticles/basic_two_stroke.html :
Cylinder heads can be reshaped to change the power band. Generally speaking, a cylinder head with a small diameter and deep combustion chamber, and a wide squish band (60% of the bore area). Combined with a compression ratio of 9 to 1 is ideally suited for low to mid range power. A cylinder head with a wide shallow chamber and a narrow squish band (35-45% of bore area) and a compression ratio of 8 to 1, is ideally suited for high rpm power.
How to figure squish area:
A=3.14x(1/2 diameter)
A=103 for KDX200 that has std 66mm bore
B=3.14x(1/2 diameter of inner squish band circle)
A-B=squish area