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How to Degree a Cam: Introduction

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Introduction

02.43

00:00 - In this worked example, we're going to be looking at degreeing the cams on our Nissan SR20 DET that's had a P11 Primera VVL cylinder head fitted to it.
00:10 This is commonly referred to as an SR20 VE.
00:15 The P11 Primera cylinder head has some significant advantages over a stock SR20 DE or DET cylinder head.
00:23 Primarily because it features Nissan's take on Honda's VTEC mechanism.
00:29 In other words, each cylinder or each set of valves has both low RPM cam profiles and high RPM cam profiles.
00:37 And this allows the cam profiles to be tailored more accurately to the RPM range under which they're going to be operating.
00:44 In plain English, this means that we can have a cam profile that gives good low RPM performance, good idle quality and good fuel economy.
00:53 But at higher RPM when switch to the larger lobe which offers more lift and more duration, we can have a cam profile optimised for high RPM performance.
01:03 Now while we will be focusing here on the VE cylinder head, this worked example is still going to be valuable to anyone using a conventional SR20 DET cylinder head.
01:16 Obviously there's going to be some aspects with the switchable cam system that won't relate but the general gist of this worked example will still be 100% applicable.
01:28 For this particular engine build, we've selected a set of Kelford aftermarket cams that are suited towards a turbocharged application using the P11 Primera cylinder head.
01:39 These are actually a slightly more conservative grind that the stock P11 cams as the stock cams are designed around a naturally aspirated engine.
01:48 The cams we've selected offer 246 degrees of duration at one millimetre of lift and they offer 10.6 millimetres of valve lift on both the inlet and the exhaust side.
02:00 Now in order for us to be able to degree these cams, it is essential that we lock the VVL mechanism into operating only on the high lobe profile.
02:10 There's a variety of ways that this can be done, including dissasembling the rocker assembly and mechanically fixing it into the high lobe operation mode.
02:19 However in this instance what we've done is simply used cable ties temporarily to lock the VVL mechanism in.
02:27 Obviously it's going to be essential to remove those cable ties after the cam degreeing has been performed.