teddan Posted September 30, 2012 Share Posted September 30, 2012 (edited) I have bought BC 289 cams and to fit them I need to fix the clearance. Have anyone ideas or pictures about this? Seems to a lot of grinding or machining. I measure the standard clearance for the cams to the head and it was around 3mm. Is the minimum measure for how close it can be? Need some help for this issue Edited October 2, 2012 by teddan (see edit history) Quote Link to comment Share on other sites More sharing options...
Callaway Motorsport Posted September 30, 2012 Share Posted September 30, 2012 Didn't the box have instructions with it? Quote Link to comment Share on other sites More sharing options...
teddan Posted September 30, 2012 Author Share Posted September 30, 2012 Not for how to fix the grinding to the head just valves clearance Quote Link to comment Share on other sites More sharing options...
teddan Posted September 30, 2012 Author Share Posted September 30, 2012 someone who runs 2800 cams that have fix the clearance to the head? Quote Link to comment Share on other sites More sharing options...
add heywood Posted September 30, 2012 Share Posted September 30, 2012 I have 280's but Dude did them for me (and he isnt too well at the min). Fire a pm to Jurgen as they had my car and fitted the cams also but i think they were shimmed already. Quote Link to comment Share on other sites More sharing options...
teddan Posted October 1, 2012 Author Share Posted October 1, 2012 pm fired but he had not fit any Quote Link to comment Share on other sites More sharing options...
teddan Posted October 1, 2012 Author Share Posted October 1, 2012 Full Race: BC0303 Giant lift profile for ultimate RPM. Full race motor running race fuel. Tuning ECU mods required. Requires kit BC0300. Shimless buckets & cylinder head clearancing required. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 1, 2012 Share Posted October 1, 2012 Do you mean the lobes catch the head casting either side of the tappet buckets and the head CASTING needs reliefs milling? I can do that. Or do you mean shimming the valve clearances? The LIFT of the cam relative to its base circle diameter defines whether reliefs are needed. I am confused, first you mention a 280 degree duration cam, then some wild drag race / circuit race cam..... Quote Link to comment Share on other sites More sharing options...
teddan Posted October 2, 2012 Author Share Posted October 2, 2012 (edited) it's the lobes chris I didn’t know the English word for it.... Now i know Edited October 2, 2012 by teddan (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 2, 2012 Share Posted October 2, 2012 They are fiddly and time consuming to do on a milling machine. I have some photos of my RB26 head after I cut the reliefs, not sure where they are now, probably on a n old hard drive. I can do these, but you are a long way away. ANY good machinist should have no trouble, he'll just look at it as another lump of metal needing carving about, not a Supra head. Quote Link to comment Share on other sites More sharing options...
teddan Posted October 2, 2012 Author Share Posted October 2, 2012 it will be awsome if you had some photos of it! Then I will take the head to my work and machine it Thanks alot! Quote Link to comment Share on other sites More sharing options...
teddan Posted October 2, 2012 Author Share Posted October 2, 2012 (edited) I had take some photos of the problem. the lobs hits the head like this other side so it has be machined something like this to make clearance( this was grinded by hand and it will be machined later on, just want to make an ide how i am thinking) Will the buckets still not move to much in the side when i rev 8000 after this machining? Its a lot of machining, specielly one of the sides! (that one closest to the intake) Edited October 2, 2012 by teddan (see edit history) Quote Link to comment Share on other sites More sharing options...
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