grumpyvette Posted February 13, 2006 Share Posted February 13, 2006 heres a brief course on cams to get you up to speed on the concepts http://www.oregoncamshaft.com/cam-basics.html http://www.symuli.com/vw/camp1.html http://www.symuli.com/vw/camp2.html http://www.auto-ware.com/combust_bytes/camspecs.html http://www.rpmoutlet.com/camfac.htm http://www.chevyhiperformance.com/techarticles/95298/ http://www.hotrod.com/techarticles/43418/index3.html http://hotrod.com/techarticles/113_0209_cam/ http://hotrod.com/techarticles/113_9811_cam/ http://hotrod.com/techarticles/113_9804_cam/ http://www.ridgenet.net/~biesiade/camdegree.htm http://www.mousemotor.com/cb_1.htm http://www.digitalcorvettes.com/forums/showthread.php?t=39010 1985,1992,1996 vettes keep the rubber side down and the Quote Link to comment Share on other sites More sharing options...
silicone boy Posted February 13, 2006 Share Posted February 13, 2006 Thanks Mr. Grumpy. Despite all the complex stuff I've been forced to learn in my 30+ years of education, cams are something I haven't fully understood. I'm sure these links will help. Quote Link to comment Share on other sites More sharing options...
John Scott Posted February 14, 2006 Share Posted February 14, 2006 I love Grumpy's never ending information links. I can't count how many of his links I've saved...now, if I could apply everything he's posted I would have way more power than I do. Keep 'em coming Grump! John Quote Link to comment Share on other sites More sharing options...
Some-Guy Posted February 14, 2006 Share Posted February 14, 2006 thanks again for more great info Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted February 14, 2006 Author Share Posted February 14, 2006 theres a BUNCH of factors that must be looked at...when matching components.... http://victorylibrary.com/mopar/intake-tech-c.htm http://victorylibrary.com/mopar/cam-tech.htm http://www.rbracing-rsr.com/runnertorquecalc.html http://headerdesign.com/extras/engine.asp#Intake_Manifolds http://www.bgsoflex.com/intakeln.html http://www.wallaceracing.com/runnertorquecalc.php http://www.mercurycapri.com/technical/engine/intake/pt.html the calculators above will allow you to match the engines intake port length and flow rates heres some basic rules of thumb as they say keep the EFFECTIVE durration of the cam matched to the compression ratio so that the DYNAMIC cpr stays in the 7.5:1-8.5:1 range and the overlap matches the chart below these are the valve timeing overlap ranges that are most likely to work correctly trucks/good mileage towing 10-35 degs overlap daily driven low rpm performance 30-55degs overlap hot street performance 50-75 degs overlap oval track racing 70-95degs overlap dragster/comp eliminator engines 90-115 degs overlap but all engines will need the correct matching dcr for those overlap figures to correctly scavage the cylinders in the rpm ranges that apply to each engines use range.look carefully at this chart example http://dab7.cranecams.com/SpecCard/DisplayCatalogCard.asp?PN=114681&B1=Display+Card here is a hot street cam that works great in many 383 camaros with at least 10.5 static cpr with 3.5-4.1 gears now the timeing is intake opens 29.0 btdc, closes 71.0 abdc exhaust opens 77.0 bbdc, closes 31.0 atdc so if we add the 29 to the 31 we get the overlap duration of 60 degs of which makes this cam fall in the center of HOT STREET youll RARELY benefit from a single plane carb intake with a cam that has less than about 230 degs durration at .050 lift, below that a dual plane carb intake works better most of the time header primary tube size should not greatly exceed the exhaust port size http://www.slowgt.com/Calc2.htm#Header http://victorylibrary.com/mopar/otto-c.htm Quote Link to comment Share on other sites More sharing options...
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