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Wiredrawing Check
Posted by: Jerry Peoples (IP Logged)
Date: November 13, 2002 11:07AM
<HTML>I have been crunching numbers to establish wire drawing trends. I evaluated three cases for a four inch piston having a three inch stroke. The engine speed was fixed at 2000 rpm. The valves were proppets with diameter 1, .875 and .750 inch diameters. Valve lift was taken as one fourth of the diameter. In all cases the throttle pressure was 800 psia.
The engine is a high compression configuration. Valve closing is initiated at 12 degrees past TDC. Results are summarized below and are offered for information. Also, I seek verification for purposes of validating my model.
Valve Diameter Final Cylinder Pressure
1.0 643
.875 620
.75 592
In the first case (1 inch diameter), throttle pressure was sustained for .4 milliseconds, then cylinder pressure began to drop. At one millisecond (initiation of valve closure) the cylinder pressure had dropped 5.5 psi. It took an additional 1.39 milliseconds to seat the valve. The cylinder pressure was 643 psia at a crank angle of 28.72 degrees. Thanks!
Valve Weight - .3 pounds
Spring Force - 200 pounds
Clearance - 1.4 cubic inches
Coeff. of Discharge - .6
Temperature - 1250 R
Max Steam Flow - .9884 lb/sec
Cylinder Volume @ 2.39 milliseconds (valve closure)- 3.891 in3
Jerry</HTML>
The engine is a high compression configuration. Valve closing is initiated at 12 degrees past TDC. Results are summarized below and are offered for information. Also, I seek verification for purposes of validating my model.
Valve Diameter Final Cylinder Pressure
1.0 643
.875 620
.75 592
In the first case (1 inch diameter), throttle pressure was sustained for .4 milliseconds, then cylinder pressure began to drop. At one millisecond (initiation of valve closure) the cylinder pressure had dropped 5.5 psi. It took an additional 1.39 milliseconds to seat the valve. The cylinder pressure was 643 psia at a crank angle of 28.72 degrees. Thanks!
Valve Weight - .3 pounds
Spring Force - 200 pounds
Clearance - 1.4 cubic inches
Coeff. of Discharge - .6
Temperature - 1250 R
Max Steam Flow - .9884 lb/sec
Cylinder Volume @ 2.39 milliseconds (valve closure)- 3.891 in3
Jerry</HTML>
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