Gamer Posted February 11, 2007 Share Posted February 11, 2007 Does anyone know what the specs are for HKS cams (264/264). I need to know the valve lift @ TDC for the inlet and exhaust. Also do oversized valves (1mm) effect timing ? (probably a silly Q) Quote Link to comment Share on other sites More sharing options...
Nic Posted February 12, 2007 Share Posted February 12, 2007 Does anyone know what the specs are for HKS cams (264/264). I need to know the valve lift @ TDC for the inlet and exhaust. The max lift of the 264 HKS cams (in & ex) is 9mm. Quote Link to comment Share on other sites More sharing options...
geoffvalenti Posted February 12, 2007 Share Posted February 12, 2007 Hi Joe Just FYI, you don't actually measure valve lift with reference to TDC. TDC describes when the piston is at the very top of its stroke and has no bearing on the amount of valve opening which is, as I'm sure you know, governed by the camshaft. Oversize valves have no mechanical effect on timing, but "may" have an effect on the optimum valve and ignition timing settings for a particular engine. HTH Quote Link to comment Share on other sites More sharing options...
ajazyasin Posted February 12, 2007 Share Posted February 12, 2007 Ive been having real problems with HKS uk giving me cam specs so good luck with them. I emailed HKS direct and they said go ask the person who fitted them initially! Unfortunately HKS dealers dont have that information to hand as its usually written on the box and not in catalogues. Quote Link to comment Share on other sites More sharing options...
Gamer Posted February 12, 2007 Author Share Posted February 12, 2007 Cheers for the info guys. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 12, 2007 Share Posted February 12, 2007 Valve size has no bearing on cam timing, per se. Lift at TDC is easily measured in real time, but all good cam makers should be able to give you this figure. Quote Link to comment Share on other sites More sharing options...
Gamer Posted February 12, 2007 Author Share Posted February 12, 2007 Ok, thanks, just trying to get some info to make sure my cams are set up correctly as I am still having some high egt issues. While I had the car on the RR, I was observing the manifold and runner no 2 and 5 seemed to be getting cherry red about 1-2 seconds before the rest of the runners. I was asked to find out the HKS specs for the valve lift at TDC. Could the high egt's be caused by a bad valve or maybe a valve guide or something else is worn ? Quote Link to comment Share on other sites More sharing options...
Gamer Posted February 12, 2007 Author Share Posted February 12, 2007 Ok, I think I have found the info that I needed although most of it is in Japanese. This is taken from one of the pages in a booklet that came with my 264in camshaft. Quote Link to comment Share on other sites More sharing options...
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