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Old February 24th, 2010, 08:21 PM   #1
jeepyj93
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Default Camshaft question. single/dual pattern

I have found that certain engines have "single" pattern cams, and some have "dual" pattern cams. What does this mean? Can someone explain this to me please.
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Old February 24th, 2010, 08:45 PM   #2
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single pattern means that the intake and exhaust profiles have the same exact measurements. a dual pattern will have 2 slightly different measurements between the intake and exhaust lobes. example. single pattern might be 282/282 duration .450/.450 lift.
a dual pattern might be 282/288 duration .450/.467 lift. the exhaust almost always has more lift and duration on a dual pattern cam
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Old February 24th, 2010, 08:56 PM   #3
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Originally Posted by Kodiak450r View Post
single pattern means that the intake and exhaust profiles have the same exact measurements. a dual pattern will have 2 slightly different measurements between the intake and exhaust lobes. example. single pattern might be 282/282 duration .450/.450 lift.
a dual pattern might be 282/288 duration .450/.467 lift. the exhaust almost always has more lift and duration on a dual pattern cam
Thank you for the info. Which camshafts are considered better performance wise? Or does it depend on you engine setup?
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Old February 24th, 2010, 09:16 PM   #4
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there is a lot of technical specs when choosing a cam... rpm operating range, torque converter stall if auto, weight, tire size, intended use of vehicle, compression ratio, etc..
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Old February 24th, 2010, 09:44 PM   #5
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there is a lot of technical specs when choosing a cam... rpm operating range, torque converter stall if auto, weight, tire size, intended use of vehicle, compression ratio, etc..
I was just wondering cause I am getting an engine out of a cherokee. and certain years have single pattern, and some have dual pattern. I was wondering if one was better than the other. Thanks
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