how to pick a cam
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Joined: Oct 2001
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From: loxahatchee fla
how to pick a cam
how to pick a cam
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well Im sure someone will say , " the more lift and duration the better" but its not that simple, like everything else in an engine there are some compromises, first thing to consider is what the cam/engine will be used for, the flow rates of the cylinder heads,intake,carb,headers, car weight, gear ratios,ETC. your useing, next the rate of lift the lobe has, the type of cam , possiable clearance problems, ramp speeds, valve float rpm,duration,of the cam,rpm range it will be run in, rocker arm ratio used, lifter diameter,valve spring pressures,type of lifter, is a rev. kit used,engine displacement,ETC but as a general rule you first find the lift at which your head flow peaks and try to get the valve just above that lift for the longest possiable time that does not cause an excessive loss of torque in the lower rpm ranges you intend to operate in through loss of cylinder pressure from overlap caused by to great a duration or to tight of a spaceing in the LSA. look here,read
http://www.newcovenant.com/speedcraf...camshaft/1.htm (look at lessons 1-9)
http://www.racinghelp.com/picking_camshaft.html http://ourworld.compuserve.com/homepages/axelg/cams.htm
http://fly.hiwaay.net/~drickard/cam.htm
http://www.wighat.com/fcr3/camtruth.htm
http://tru-442.tripod.com/camselect.htm
http://www.sdsefi.com/techmods.htm
as a last option http://camadvice.com/
[Modified by grumpyvette, 8:55 PM 4/2/2002]
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well Im sure someone will say , " the more lift and duration the better" but its not that simple, like everything else in an engine there are some compromises, first thing to consider is what the cam/engine will be used for, the flow rates of the cylinder heads,intake,carb,headers, car weight, gear ratios,ETC. your useing, next the rate of lift the lobe has, the type of cam , possiable clearance problems, ramp speeds, valve float rpm,duration,of the cam,rpm range it will be run in, rocker arm ratio used, lifter diameter,valve spring pressures,type of lifter, is a rev. kit used,engine displacement,ETC but as a general rule you first find the lift at which your head flow peaks and try to get the valve just above that lift for the longest possiable time that does not cause an excessive loss of torque in the lower rpm ranges you intend to operate in through loss of cylinder pressure from overlap caused by to great a duration or to tight of a spaceing in the LSA. look here,read
http://www.newcovenant.com/speedcraf...camshaft/1.htm (look at lessons 1-9)
http://www.racinghelp.com/picking_camshaft.html http://ourworld.compuserve.com/homepages/axelg/cams.htm
http://fly.hiwaay.net/~drickard/cam.htm
http://www.wighat.com/fcr3/camtruth.htm
http://tru-442.tripod.com/camselect.htm
http://www.sdsefi.com/techmods.htm
as a last option http://camadvice.com/
[Modified by grumpyvette, 8:55 PM 4/2/2002]
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Joined: Nov 1999
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From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
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Re: how to pick a cam (grumpyvette)
Sounds like you enrolled in Cam Shaft 101.
All you answers are there. You now just have to figure them out. ;)
All you answers are there. You now just have to figure them out. ;)
