SR20 Camshaft Issue: Looking for some input

For the RWD SR20DET cars! Sponsored by Wiring Specialties.
User avatar
2_Liter_Turbo
Posts: 2674
Joined: Sat Jan 24, 2004 10:41 am
Car: _________________
'96 S14 Coupe: SR20VET
'90 R32 TH1 GTR: RB26DETT
'92 S13 Fastback: SR20DET
'11 V36 Sedan: VQ25HR
'06 GMT800 2500HD: LBZ Duramax
Location: DFW, Texas
Contact:

Post

So I got all of my head stuff back today, and I noticed something I've missed when I took everything apart. On the #4 lobe of my exhaust cam, one edge seems to be slightly higher (.001"-.002" is the best I can measure atm) as if the rest of the lobe was worn down but not that edge maybe? These cams have at most 3k miles on them between two failed motor builds (sad I know). They haven't been run since I sent them out for WPC treatment and they were used for adjusting the lash between the rocker and cam by Port Flow Design.

Image

Image

Here you can see that the rocker arm (if sitting in the middle) rides right on the edge. If you slide the rocker arm across the lobe, it does catch on the lip of the groove.
Image

I'm not sure if I should run the cam or not. Part of me thinks that if the rocker arm doesn't hit it, I should be fine. I'm mainly worried about rocker arm tilt. Any constructive input would be greatly appreciated!


User avatar
Lobo240sx
Posts: 779
Joined: Wed Dec 01, 2010 7:39 am
Car: 1991 Nissan 240sx Coupe SR2.35DET Redtop Build
Location: Austin, Texas USA

Post

You should take it back to the machine shop and verify with a micrometer if you don't have one. Plan on using RAS on the rockers? If in any doubt upgrade to a humango cam!! :cool:


Return to “SR20DET Forum (rear-drive)”