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Thread: 6.0 LS Build
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11-26-2018 #61Registered User
- Join Date
- Nov 2018
- Location
- Winston Salem, NC
- Posts
- 94
It's all about valve events and how long you keep that valve open to let as much air in and how much you are able to get out on the exhaust side
Actually the cam you speak of would have more overlap 54.5* vs 51*
Should lope a very little bit more, nothing noticeable
As far as low rpm torque the XER Lobes would close at 64.5* ABDC vs summits at 65* ABDC the lower the closing angle the higher the DCR and cylinder pressure.
But as far as numbers are concerned, trivial and almost dead equal until we start talking about the area between where that valve opens, the ramp rate, the lift and then where the valve closes.
Now when you envision the summit lobe coming off the seat at 274 at .004 and 222 at .050 with a .545 lift vs 273 at .004 and 224 @ .050 with .581 lift its pretty obvious which one took in the most air and will have the most cylinder pressure down low. More air entering the chamber will generate higher cylinder pressures given they are closing at the same time. Or in this case the XER even sooner. This means more torque down low. You spell it out like the only gains would be 5500 to 6500 with loss of torque down low. LOL The XER lobe in this example would drag this soft summit lobe throughout the powerband.
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11-28-2018 #62