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How do you figure a cams centerline? #664240 04/08/10 01:36 AM 04/08/10 01:36 AM
Joined: Jul 2006 Posts: 4,319 Puyallup, WA S StealthWedge67 OP master
StealthWedge67 OP master S Joined: Jul 2006 Posts: 4,319 Puyallup, WA	my cam card gives info on lift, duration both at .050 and running, and valve opening and closing points. What is the formula for taking this info and figuring the centerline? LemonWedge - Street heavy / Strip ready - 11.07 @ 120

Re: How do you figure a cams centerline? [Re: StealthWedge67] #664241 04/08/10 08:57 AM 04/08/10 08:57 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	post the opening and closing points. Intake installed centerline + Exhaust installed centerline / 2 = Cam LSA (centerline). So if the intake is to installed 106 ATDC and exhaust is to be installed 114 BTDC 106 + 114 = 220 / 2 = 110 Lobe separation angle (cam centerline) Last edited by Dodgem; 04/08/10 09:01 AM.

Re: How do you figure a cams centerline? [Re: StealthWedge67] #664242 04/08/10 11:29 AM 04/08/10 11:29 AM
Joined: Mar 2003 Posts: 571 Beaverton, OR, USA Alikazam super gas
Alikazam super gas Joined: Mar 2003 Posts: 571 Beaverton, OR, USA	If you take the intake openning point (keeping in mind 360 degrees rotational angle) and closing point and figure the point inbetween you can find the intake installed centerline. Same with the exhaust. If you have the numbers you can use those to figure it out, just keep in mind TDC = 0. BDC = 180, and do the math accordingly Hope that helps!

Re: How do you figure a cams centerline? [Re: Alikazam] #664243 04/08/10 04:47 PM 04/08/10 04:47 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	If intake opens before bottom Dead Center (IO + IC + 180)/2 - IO = ICL ex is basically the same computation but subtract the EC event number Here's a computation for a 284/528 solid MP cam. IO 32 EO 76 IC 72 EC 28 -------------------- Intake 32 + 72 + 180 = 284 284/2 = 142 142 - 32 = 110 --------------------- Ex 76 + 28 + 180 = 284 284/2 = 142 142 - 28 = 114 --------------------- LSA = (ICL + ECL)/2 110 + 114 = 224/2 = 112

Re: How do you figure a cams centerline? [Re: StealthWedge67] #664244 04/08/10 04:49 PM 04/08/10 04:49 PM
Joined: Dec 2008 Posts: 1,200 UK 6 602heavy pro stock
602heavy pro stock 6 Joined: Dec 2008 Posts: 1,200 UK	Quote: my cam card gives info on lift, duration both at .050 and running, and valve opening and closing points. What is the formula for taking this info and figuring the centerline? Are you asking for the lobe seperation angle or the installed intake centreline? , these #s will usually differ around 4*.

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