02-21-2010, 06:43 PM | #1 |
Dazed and Confused
Join Date: Mar 2009
Location: Northport, Al
Posts: 778
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Lobe Seperation Angle
I was reading up on this to find a good spec for a turbo cam and came across some conflicting info on calculating it.
Using my X-303 as an example, one way showed adding the intake center and the exhaust center and divide by 2. So 107+117/2= 112 LSA The other way used an engine math calculator taking the advertised duration of 286 and the intake opening of 5* and the exhaust opening of 49* and it came up with 116 LSA Why the difference?
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02-22-2010, 07:06 AM | #2 |
Gone but not forgotten
Join Date: May 2008
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Ford Racing shows a 112 for the x-cam... sounds like the second method is off.
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02-22-2010, 08:43 AM | #3 |
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Join Date: Dec 2004
Posts: 6,313
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The first method is correct. You can get there with the durations and open/close events, but they have to be at the same lift measurement.
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