Engine Tech Series
A good read for everyone, not just Mopar enthusiasts!
Mopar Rocker Arm Geometry, Part 4
In the previous article I mentioned getting into the pushrod side of valvetrain geometry, and that is the focus of this article. This is the one area where problems are not easily corrected primarily because the adjuster location is designed into the rocker arm by the manufacturer, and this design is generally a compromise based on other considerations such as cost, materials, and manufacturability. more...
A good read for everyone, not just Mopar enthusiasts!
Mopar Rocker Arm Geometry, Part 3
Now, as if the out-of-control parts-wrecking accelerations and decelerations weren’t bad enough, some real performance is lost. How, you ask? Simply put, if the valvetrain is not set to the 1/2-lift method, there is inefficiency and power is lost. If the fulcrum point (shaft) is too low, the valve will accelerate slowly off the seat and require more degrees of crankshaft rotation to reach a given lift, up to the point where it reaches a perpendicular plane to the valve stem, where it finally catches up. more...
Mopar Rocker Arm Geometry, Part 2
Welcome back, everyone! In the last segment we discussed the different fulcrum lengths and the effects on roller placement on the tip of the valve. I also threw in a teaser with the corrected Proform rocker arm, which is widely regarded as one of the worst rockers for Mopar engines available. Even the Proform can have acceptable geometry, and in a very mild, low rpm street application should work well for a long time. more...
Mopar Rocker Arm Geometry, Part 1
The objective of this article is to thoroughly explain the importance of proper valvetrain geometry, and to address the mountains of misinformation and detrimental advice given on this subject, especially to the Mopar crowd. This article may get lengthy, detailed, and deep, but stick with us because the goal is to have you informed with logical, common-sense information that will help you get the most out of your performance engine. more...