What distance is indicated by the connecting rod length?
Most automobiles work best with a connecting rod ratio of 1.65 to 1.75. A major step in identifying the ratio is to accurately measure the length of the connecting rod, which is the distance between the centers of the large and small holes in the rod.
What is the length of connecting rod?
A Connecting Rod is measured between the centers of the crankshaft journal bore and the piston pin bore. It can be listed in inches or millimeters. The connecting rod’s length will impact Rod Ratio . Also, changing the rod length will require new pistons with the correct Compression Height .
Does rod length affect piston speed?
While average piston speed is not affected by rod length, there is a difference in piston speed at varying points through the stroke. Shorter rods are faster through mid-stroke and spend less time at top dead center, while longer rods are slower through these areas but spend less time at the bottom of the stroke.
What do longer connecting rods do?
A longer connecting rod will keep the piston further up in the cylinder bore when at BDC for a given stroke. The small end of the rod, which is connected to the piston pin, is further up the cylinder bore with a long rod as compared to a short rod.
What is the compression height of a piston?
Piston compression height is the distance between the centerline of the pin to the flat part of the top of the piston.
How is the length of a connecting rod measured?
When measuring connecting rod length, we’re really talk- ing about center-to-center length—the distance from the center of the piston pin bore to the center of the big-end bore.
Which is the center of a connecting rod?
The centre connecting rod has a palm end at the lower end to which the bottom end-bearing keeps are bolted, whereas the upper end of the rod has an integral continuous lower half keep to which the upper half-bearing keeps are bolted.
How big of a bend do you need for a connecting rod?
OE specs for bend tolerance vary, but generally, maximum allowable bend should be limited to .001 in. per inch of rod length. If the rod is bent beyond this maximum, this will squeeze oil clearance on one side of the rod bearings, creating a “tapered” oil clearance issue.
What’s the maximum force for a connecting rod?
Right click the Force (Revolution:3) column > Select Search Max. The maximum force for the Force (Revolution:3) joint is 7280 N and occurs at time 0.0153 seconds. We will export this force to the Stress Analysis environment. The value may differ . 7. Tick in the Export to FEA column at 0.0153 seconds to export loads at this time frame
When measuring connecting rod length, we’re really talk- ing about center-to-center length—the distance from the center of the piston pin bore to the center of the big-end bore.
What does the center of a connecting rod mean?
The centers of the connecting rod journals represent the outside of the circle. As the crankshaft rotates (circular motion) the rod journal travels in a circle, which has a diameter equal to the stroke. When a given cylinder is at top dead center (TDC), the rod journal is directly above zero degrees of rotation on the center of the circle.
Where does the connecting rod travel in a stroker engine?
At bottom dead center (BDC), it is 180 degrees directly below the center. Although the big end of the connecting rod (connected to the crankshaft) travels in a circular motion, the small end (connected to the piston) travels in a reciprocating motion (up and down).
What should I look for in a connecting rod inspection?
Regardless of the rod’s application (stock production street engine, performance street or all-out racing), prior to rebuilding or engine assembly, all rods should be inspected for center-to-center length, big-end and small-end bore diameter, bore out-of-roundness, rod bend and twist and cracks and stress risers that could lead to rod failure.