PRI Magazine Article featuring Four Stroke Design on Jun9 2009

by FSD | Print the article |

PRI_logo_sm1Performance Racing Industry Magazine is a monthly periodical whose audience is the hardcore racing industry. From the PRI website, “From its inception in 1986, PERFORMANCE RACING INDUSTRY has served tens of thousands of racing entrepreneurs as their key source for industry trends, merchandising ideas, new products, business strategies and much, much more” . Walk into the break room or waiting area of virtually any professional race team or vendor in America and you are likely to find a PRI magazine lying on the coffee table!

PRI_CAD-CAM1The June 2009 issue of PRI magazine features an article on cutting-edge CAD/CAM Software that companies are using to aid them in their businesses. Four Stroke Design, LLC was one of the companies featured in the article.

Excerpts of the article include: “Brian Kurn of Four Stroke Design, in Charlotte, North Carolina, specializes in ground-up race engine design. “The only thing that changes is the size of the models, which is directly related to two things; the time it takes to solve and the accuracy of the result,” said Kurn. “As computer technology advances and prices get lower for faster hardware, the accuracy of simulation improves and the time to solve is reduced. This makes the process more cost effective.”

Perhaps the biggest benefit is the ability to eliminate trial-and-error proto-typing. “The days of physical prototyping are numbered,” said Four Stroke Design’s Kurn, who utilizes simulation technology including CAD (SolidWorks), Engine Simulation (Optimum-Power’s Automated Design), Valvetrain Simulation (Blair’s 4stHEAD), Dieter Zuck’s CDS, RecurDyn from FunctionSim, and CFD (Fluent/Ansys and Star-CCM+ from CD-Adapco). “Before Valvetrain Simulation, for example, everything had to be manufactured and physically tested in order to find out whether or not your design was effective. Using Valvetrain Simulation, several designs can be evaluated in a short period of time.”

Simulations can also shortcut the testing procedure, significantly reducing or even eliminating testing costs. “NASCAR engines use pushrod-operated valvetrain systems,” Kurn continued. “The dynamic valve lift curves are radically different when compared to the static valve lift curve of a given pushrod valvetrain system. Being able to predict dynamic valve and spring behavior is very valuable in a market as highly competitive as NASCAR Sprint Cup racing. With Valvetrain Simulation, you can explore the possibilities with a high degree of confidence and identify possible design flaws.”

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