Modern Automotive Performance
Modern Automotive Performance

GSC Power Division Press Release – New R2 Profile Camshafts for the Evo 9 MIVEC Head!

Posted on 12 February 2013

Modern Automotive Performance

GSC_6009R2

 

After a very lengthy backorder on blanks we are finally making way into the Evo 9 cams. A slight change to our blank has allowed us to increase the lift and offer a new profile to better serve the stroked engines that are so commonly used with the 4G63 Mivec head.  We worked with English Racing on this profile to offer the 2.2-2.4  lower reving engines with mivec control a profile that would allow for more air volume in the cylinder to help fill the larger displacement engines and make more midrange and top end power. The 6009R2 is a high lift very aggressive profile with a short overall duration to keep a lower usable rpm band. The 6009R2 is designed to rev between 4000-8500 rpms and should be used with a stroked engine or added displacement engine. The peak lift of 12.1mm intake and 11.9mm exhaust will require upgraded valve springs and a titanium retainer with special attention to seal to retainer clearance. With the lift of this profile it is suggested to only use the 5041/5040 Ti retainer and spring kits do to valve seal to retainer clearance. The 5041 can be used to 40+psi and the 5040 to 32psi on the R2 profile at 8500rpms without float or flutter issues.  The profile will work fine on the OEM Rocker Arm and the Zero-tick lifter or with the OEM lifter.  We have seen gains of 25-30whp over the S2 profile on the stroked applications with much more possible when used with a ported head and aftermarket intake manifold.

We are running a batch of these after we finish with our Evo 9 S2 Backorders and should be able to ship as early as Wednesday of next week. We are also planning to release an Evo 8 version of this profile but do to present stock and lead time on that new blank we won’t see it till April.

For more information on these cams, please visit MAPerformance.com

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