heavy85 Posted September 4, 2004 Share Posted September 4, 2004 I read on an old post that Norm resurfaced his rocker arms on his 12 second Z ..... and I dont want to spend the $$ for new ones ..... but I want a new cam ..... got me thinking I should just resurface the one's I've got. Any advice on this - I was kind of thinking to sand down the surface to get rid of the old wear marks then move to progressively finer paper untill it was real shiny. Does this sound reasonable? Cameron Quote Link to comment Share on other sites More sharing options...
JMortensen Posted September 4, 2004 Share Posted September 4, 2004 The rocker arms have a curved contact surface. Anyplace that grinds cams can properly resurface the rockers. You'll need to change your lash pads in all likelihood if you change either the cam or the rockers or both. Quote Link to comment Share on other sites More sharing options...
mjfawke Posted September 5, 2004 Share Posted September 5, 2004 You can resurface the arms on wet/dry... approx 280 - 320 grit from memory was what I used last time. You have to be careful to keep them straight, and clean up the tips at the same time. One the engine is running again, watch for scuffing on the lobes and rocker arms. If any start to scuff, pull the rocker arm and clean up lightly again on wet/dry and do the same for the cam. I had a set professionally reconditioned (new are basically NA in Australia), and the stone they used was not - the cam lobes were running on only about half the surface area of the rocker arm. Killed the cam... Quote Link to comment Share on other sites More sharing options...
ToplessZ Posted September 5, 2004 Share Posted September 5, 2004 Why not use the 320 grit paper then hit them with a buffer if its available. Woulnt the near mirror surface be a good thing. Just asking because I was thinking of this myself. I need to get a set race prepped anyway. Hopefully that should not be very expensive. Quote Link to comment Share on other sites More sharing options...
mjfawke Posted September 5, 2004 Share Posted September 5, 2004 Nope - you need some surface roughness to hold oil while the cam and rocker arm bed in... the same reason that piston skirts are not polished. Quote Link to comment Share on other sites More sharing options...
gramercyjam Posted September 7, 2004 Share Posted September 7, 2004 I picked the best of the bunch in my collection of about 100 or more rocker arms ensuring the castings were all similar. I wouldn't attempt resuracing them by hand on deeply worn rockers though. I used some medium emory, then fine emory, then some 320 wet and 400 wet. Came out very nice. It didn't take all that long. Just set the abrasive side up on a table and run the rockers slowly back and forth with a slight rocking motion until you no longer see the line from cam wear. Try to keep pressure even on both sides while you do this, and turn the rocker over frequently to visually check that you are grinding it evenly and not round ing the surface side to side or putting a flat spot on the rocker. Quote Link to comment Share on other sites More sharing options...
Pyro Posted September 7, 2004 Share Posted September 7, 2004 Delta Cams resurfaces rocker arms for 3.75 each (45.00 for 12) and grinds cams for 65.00. Quote Link to comment Share on other sites More sharing options...
DAW Posted September 8, 2004 Share Posted September 8, 2004 I haven't been over to Delta cams for awhile. They profiled an L4 cam for me one time that I had no info on and they were good to work with and I remember being impressed with the good quality/price of their work. Does anyone have experience with their cam grinds, especially for L6 turbo, or rocker arm resurfacing? DAW Quote Link to comment Share on other sites More sharing options...
gramercyjam Posted September 8, 2004 Share Posted September 8, 2004 There's someone around here with some Z's that sells re-ground delta cams and rockers on ebay. He likes them. He was running out of used rockers to regrind though. I'm hanging onto my stash and will probably get some of the more worn ones reground there. Quote Link to comment Share on other sites More sharing options...
DAW Posted September 9, 2004 Share Posted September 9, 2004 Thanks, John. BTW, I bought a rebuilt R190 4.44 that I've autocrossed with and it is NOISY. I haven't looked into it yet, but I'd like to hear you say that they are all noisy! DAW Quote Link to comment Share on other sites More sharing options...
gramercyjam Posted September 9, 2004 Share Posted September 9, 2004 Sorry to say, I haven't noticed that mine is noisy. But my exhaust is pretty loud and I don't hear much of anything. After a run though, after shutting down the car, a few minutes later (probably as the diff cools off), I do get one little BANG back there. Not sure what that is. Quote Link to comment Share on other sites More sharing options...
DAW Posted September 10, 2004 Share Posted September 10, 2004 Thanks, John. It's in a street legal BSP 240Z, I think I'll transfer it to my PL510 with the louder pipes so I can't hear it. DAW Quote Link to comment Share on other sites More sharing options...
ecp48 Posted September 13, 2004 Share Posted September 13, 2004 Try the following email address. Mitch Mitchamore of Mitchamore's Garage in Texas. He used to be on ebay all of the time. Does Cams and Followers. They look very good and mike out true as well. I don't have enough time on them yet to say more. E. E. Mitchamore <emitch@worldnet.att.net> Quote Link to comment Share on other sites More sharing options...
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