Rinus Posted December 15, 2011 Share Posted December 15, 2011 He there, just pre-fitted hks 264 cams, torqued as the manual says.. Intake cam clearence between 0,04-0,06mm , exhaust between 0,10-0,12mm. Should be intake 0,20 +/- 0,03 , exhaust 0,30 +/- 0,03, Is this normal that all shims need replacement? Had stock jspec noks in before... Quote Link to comment Share on other sites More sharing options...
Rinus Posted December 15, 2011 Author Share Posted December 15, 2011 Cannot be its too cold outside? Quote Link to comment Share on other sites More sharing options...
Wez Posted December 15, 2011 Share Posted December 15, 2011 Shouldn't you always re-shim to spec when fitting cams Quote Link to comment Share on other sites More sharing options...
Scott Posted December 15, 2011 Share Posted December 15, 2011 Always re-shim with new cams. Regardless of if they are aftermarket or not there will always be variances. Quote Link to comment Share on other sites More sharing options...
hodge Posted December 15, 2011 Share Posted December 15, 2011 As above have said. Stock cam tolerances are 0.15-0.25mm intake 0.25-0.35mm exhaust If you set the at bang on mid tolerance you won't go wrong. So 0.2mm intake and 0.3mm exhaust. Quote Link to comment Share on other sites More sharing options...
Scott Posted December 15, 2011 Share Posted December 15, 2011 I was given different tolerances for my cams, it was on the cam card what they had to be set to. Just in case you get something different. Quote Link to comment Share on other sites More sharing options...
SupraDan24 Posted December 15, 2011 Share Posted December 15, 2011 Can someone explain what is meant by Cam tolerances/clearance etc? Quote Link to comment Share on other sites More sharing options...
hodge Posted December 16, 2011 Share Posted December 16, 2011 Can someone explain what is meant by Cam tolerances/clearance etc? Where do I start, ok !! There is a bucket that sits on top of the valve spring with a shim (spacer) in it. Once the cam is fitted and torqued, the cams have teardrop shaped lobes on then which give the lift. On each bucket and shim you need to rotate the cam so that the bottom part of the teardrop is above the shim. Then with the relevant feeler gauge check the gap between the shim and cam. To get the correct tollerence the shims are changed. So in the case of the intake side the gap needs to be between 0.15-0.25mm. Hope this explains Will. Quote Link to comment Share on other sites More sharing options...
Scott Posted December 16, 2011 Share Posted December 16, 2011 Can someone explain what is meant by Cam tolerances/clearance etc? I did a guide on it that wasn't bothered with. If you do a little search under my name in the technical section you should find it. Quote Link to comment Share on other sites More sharing options...
Rinus Posted December 16, 2011 Author Share Posted December 16, 2011 Ok, I knew I should re-shim, but sometimes I see people who only had to re-shim 4-10 shims, not all 24, so I thought this was a bid strange... Quote Link to comment Share on other sites More sharing options...
Scott Posted December 16, 2011 Share Posted December 16, 2011 Ok, I knew I should re-shim, but sometimes I see people who only had to re-shim 4-10 shims, not all 24, so I thought this was a bid strange... You won't have to re-shim them all. You swap them around for them to suit. By the time I swapped mine all around I needed 7. I could have ground them down but decided to just get new. Quote Link to comment Share on other sites More sharing options...
Digsy Posted December 16, 2011 Share Posted December 16, 2011 (edited) 0.2 intake and 0.3 exhaust are pretty standard clearances. I'd be surprised if anything massively different was quoted. In case anyone is wndering why they are different, its because on he exhaust side at running temperature the valve elongates more than the head expands, and so the clearance closes up to about 0.25mm whereas on the intake side the head expands more than the valve grows, so the clearance opens up to about 0.25mm Edited December 16, 2011 by Digsy (see edit history) Quote Link to comment Share on other sites More sharing options...
Scott Posted December 16, 2011 Share Posted December 16, 2011 0.002" of a difference on GSC stg1s from stock. Quote Link to comment Share on other sites More sharing options...
Digsy Posted December 16, 2011 Share Posted December 16, 2011 2 thou less or more clearance? Quote Link to comment Share on other sites More sharing options...
Ian C Posted December 16, 2011 Share Posted December 16, 2011 I did a guide on it that wasn't bothered with. If you do a little search under my name in the technical section you should find it. I think you'll find it's in the FAQ section Quote Link to comment Share on other sites More sharing options...
Scott Posted December 16, 2011 Share Posted December 16, 2011 2 thou less or more clearance? More clearance required Quote Link to comment Share on other sites More sharing options...
Scott Posted December 16, 2011 Share Posted December 16, 2011 I think you'll find it's in the FAQ section Thief Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 16, 2011 Share Posted December 16, 2011 Ok, I knew I should re-shim, but sometimes I see people who only had to re-shim 4-10 shims, not all 24, so I thought this was a bid strange... Hi Rinus, it's a bit odd for HKS cams to be so far out. Did you check all the clearances on the original cams before removing them? If they were near correct I am surprised that all 24 are so far out. I use and recommend HKS and Tomei cams as they are usually machined to very tight tolerances mastered off the base circel of the stock cams. I would have to ask, are you sure they are genuine HKS cams form an HKS approved re seller? I have never seen counterfeit HKS cams, but China can copy anything these days Quote Link to comment Share on other sites More sharing options...
Digsy Posted December 17, 2011 Share Posted December 17, 2011 More clearance required If it was less I'd have been concerned. More cold clearance might be a bit noisy - especially if the cam profile doesn't have ramps high enough to take up the extra clearance properly. Quote Link to comment Share on other sites More sharing options...
Scott Posted December 17, 2011 Share Posted December 17, 2011 If it was less I'd have been concerned. More cold clearance might be a bit noisy - especially if the cam profile doesn't have ramps high enough to take up the extra clearance properly. I checked it earlier and it's not 0.002" more than stock, it's actually just the upper limit of stock. 0.010" and 0.012" is the recommended clearance, it's 0.002" more than the stock standard rather than the max stock. Make smore sense I guess Quote Link to comment Share on other sites More sharing options...
Rinus Posted December 18, 2011 Author Share Posted December 18, 2011 @Chris, It sure looks like hks cams Its says hks in the cast and t083 has been drilled in intake cam and t084 in the exhaust cam, wich says 264cams when I checked hks website... Bought them second hand, they look very fresh... I have to say I use wider feelerblades now, so they are as wide as the cam itself. First I used a bit smaller and then 0,06 was like 0,10... I have taken new feelerblades cause the small ones where like; 0,05-0,10-0,15-0,20 and the little bit wider ones where like; 0,02-0,03-0,04-0,06-0,08-0,10-0,12 ---- =cam -- =first feelerblade ---- =cam ---- =second feelerblade set Quote Link to comment Share on other sites More sharing options...
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