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#41
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Same old sh!t. |
#42
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#43
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Gach,
I have actually posted cam data which shows exactly what happens when a rocker arm ratio change is made. I have actually posted cam data which shows exactly what happens when a lash change is made. What exactly have you provide for the OP? Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#44
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The Following User Says Thank You to b-man For This Useful Post: | ||
#45
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Its pretty obvious whats going on, that probably makes me a usual suspect.
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#46
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Quote:
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#47
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Quibbling over semantics....
From post #20 "He wouldn’t really answer me, because I think he saw the controversy over the Comp cam 4470/4360 lobe." I used the numbers as posted in the above example, without a decimal point. Numbers that I presume is the amount of lobe lift. As pointed out when Comp lists their lobe lift numbers in the catalog they are with three digits. Some might choose to use four digits. .447 lobe lift x 1.75 rocker ratio = .782 .4770 lobe lift x 1.75 rocker ratio = .782 Onward thru the fog .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#48
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While changing rocker arm ratio and valve lash help you dial in a camshaft that is not optimum, they do it differently. The green line is with the 1.65:1 rocker arm ratio and 0.021" lash the cam was designed for. The red line is 1.65:1 rocker arm ratio and 0.0154" lash. The blue line is 1.8:1 rocker arm ratio and 0.0229" lash. What we can see is that the green and blue lines have the same opening point / seat-to-seat duration while the red line has an increased seat-to-seat duration. The blue starts to show more duration than the red line after 0.0671" valve lift (which is 0.050" lifter raise). This is not always where that will happen. I selected the change in valve lash to cause it to happen there.
Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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