Project Racer Part 8: Nissan SR20DE S4 Cams from Jim Wolf Technology



SR20DE cam change
JWT cams in place ready for the caps to be put in.

Why are OEM parts so valuable? Think about it; manufacturers such as Nissan, Toyota, and others spend millions on the research and development of their equipment and their vehicles, which have given them their well earned reputation of being reliable, dependable cars. Aftermarket manufacturers usually don’t have even a fraction of the resources that some automakers do. So, it should be a sigh of relief when an aftermarket producer backs their products up with the claim that their products are of OEM quality. But, be warned of pseudo “like OEM” claims on e-bay and other medians of discount products – it is never more true than in the automotive industry that you get what you pay for.

For the technological aspects of these cams, JWT uses computers to aid in the design process of the cams. This computer process helps eliminate fourth order harmonics through use of a harmonic analysis program. These harmonics create spring surges or valve floats, which can be detrimental to your motor. The brains behind these S4HL camshafts have calculated the natural frequency of the valvetrain, which includes a lot of complicated math that I can’t even begin to understand. I was a business major in college for a reason.

Nissan SR20DE
All buttoned up and ready for the track again.

Before we installed the cams, we had them WPC treated along with the cam followers.  WPC treatment is a special Japanese metal surface treatment that improves life and reduces friction greatly.  You can read more about how it works here!

So now that we’ve finished this segment of our car building process – let’s get back on the track! Good practice would be to build your car in increments between building, and testing. This way if something goes wrong, you can narrow it down to specific modifications that you had made, rather than trying to figure out what went wrong with a plethora of upgrades that you had done all at once. It will be easier if you are able to evaluate each upgrade you make, and to decide which upgrades seem functional, and which ones seem not. So next month, we’ll put the car building aside, and test the NX2000 while we move up the ranks through NASA’s HPDE.

Read More Racing Tips From Annie!


Jim Wolf Technology

WPC Treatment

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