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Performance & Hotrod Business - December '14

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26 n Performance & Hotrod Business n December 2014 PERFORMANCE NASCAR has been working on a number of rule changes for 2015 involving most every aspect of its top three divi- sions. Here's a summary of the new rules package as it relates to building cars and engines. The most anticipated is the reduction of horsepower and, therefore, speeds. Effective with the races not held on the two restrictor plate tracks, Daytona and Talladega, engines will be equipped with a tapered spacer into the intake that will reduce the fuel/air mixture into the engine. This is planned to knock down the available horsepower from over 900 to 725. The spacer rule, coupled with a new rule on rear end ratios, should also reduce rpm from close to 10,000 to less than 9,000. (The speed control rules for the two restrictor plate tracks will not change.) Another new rule approves the use of roller lifters over flat tappet with increased component life costs in mind. NASCAR Announces New Rules for 2015 Doug Yates, CEO of Roush Yates, points out to what extent the new rules will affect engine builders: "The engine configuration as we know it is going to change considerably and what that means is a different camshaft," says Yates. "They're going from flat tappet to roller lifter, which is a step in the right direction for longevity. But as far as the cam design, the cylinder head, intake manifold and exhaust sys- tem—all of those things that are related to airflow— they are going to have to be developed and tested over the winter to have a package that's ready to go race next March in Atlanta." A few body and chassis changes are also included and should make for better handling and more com- petitive race cars. The rear spoilers will be reduced in height from 8 to 6 inches. A new rule allowing a driver-adjustable track (Panhard) bar will also be enacted. Another aspect all but eliminates private track testing by teams. No test- ing anywhere is now the rule. The only testing will be official testing for either NASCAR or tire testing by Goodyear. The rules are aimed at all three top divisions and the biggest effect will be reduced speeds, something that hasn't been attempted since the late '80s when the use of restrictor plates began. As far as actual horsepower reductions, 1974 saw the use of rules reducing cubic inches from 426/427/429 to 358. —John Carollo

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