Stock 6.0l head flow data
02-21-2006, 01:32 PM
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Originally Posted by BigTex
Good post Richard. Thanks.
Interesting how the flow basically flattens out at .500 lift for both intake and exhaust. Basically no change in flow all the way through .650 lift.
Interesting how the flow basically flattens out at .500 lift for both intake and exhaust. Basically no change in flow all the way through .650 lift.
02-25-2006, 10:19 AM
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Originally Posted by BigTex
Good post Richard. Thanks.
Interesting how the flow basically flattens out at .500 lift for both intake and exhaust. Basically no change in flow all the way through .650 lift.
Interesting how the flow basically flattens out at .500 lift for both intake and exhaust. Basically no change in flow all the way through .650 lift.
Originally Posted by Zick
So would this mean if you took two cams with the same duration but different lifts (.550, .600 for example) the .600" lift cam would not make any more power because of the heads?
02-25-2006, 10:52 AM
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2 cams with the same .050'' duration but, one with more lift.
215*-.600''
215*-.550''
Well, not only does the first cam have more lift... It will in most scenarios, have more duration @ .200'', .300'', .400'' exc.
So, you're increasing cylinder fill at each and all of those points.
With the 5.3L and 6.0L heads, flow stops increasing @ roughly .500'' and flatlines until .650''. Given this scenario, you can throw a lot more lift at the head and you are NOT going to loose power.
If the head is still flowing, why not throw the lift at it and increase cylinder fill?
You have to watch out for turbulence and from what I understand, the stock heads go thru a bit out past .550''.
215*-.600''
215*-.550''
Well, not only does the first cam have more lift... It will in most scenarios, have more duration @ .200'', .300'', .400'' exc.
So, you're increasing cylinder fill at each and all of those points.
With the 5.3L and 6.0L heads, flow stops increasing @ roughly .500'' and flatlines until .650''. Given this scenario, you can throw a lot more lift at the head and you are NOT going to loose power.
If the head is still flowing, why not throw the lift at it and increase cylinder fill?
You have to watch out for turbulence and from what I understand, the stock heads go thru a bit out past .550''.
02-25-2006, 03:19 PM
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Sport Side's got the right idea. Given the same duration the higher lift cam will pass through the all the lift points earlier on the opening side and later on the closing side thus adding more cylinder filling at those below peak areas.
The 6.0l chambers pose a real challenge to develop a flow curve that maintains linear flow to .600" lift without sacraficing low and midlift flow.
Richard
The 6.0l chambers pose a real challenge to develop a flow curve that maintains linear flow to .600" lift without sacraficing low and midlift flow.
Richard
02-25-2006, 04:14 PM
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Originally Posted by Sport Side
2 cams with the same .050'' duration but, one with more lift.
215*-.600''
215*-.550''
Well, not only does the first cam have more lift... It will in most scenarios, have more duration @ .200'', .300'', .400'' exc.
So, you're increasing cylinder fill at each and all of those points.
With the 5.3L and 6.0L heads, flow stops increasing @ roughly .500'' and flatlines until .650''. Given this scenario, you can throw a lot more lift at the head and you are NOT going to loose power.
If the head is still flowing, why not throw the lift at it and increase cylinder fill?
You have to watch out for turbulence and from what I understand, the stock heads go thru a bit out past .550''.
215*-.600''
215*-.550''
Well, not only does the first cam have more lift... It will in most scenarios, have more duration @ .200'', .300'', .400'' exc.
So, you're increasing cylinder fill at each and all of those points.
With the 5.3L and 6.0L heads, flow stops increasing @ roughly .500'' and flatlines until .650''. Given this scenario, you can throw a lot more lift at the head and you are NOT going to loose power.
If the head is still flowing, why not throw the lift at it and increase cylinder fill?
You have to watch out for turbulence and from what I understand, the stock heads go thru a bit out past .550''.
Excellent answer!
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