[pastry_chef]

Originally Posted by slowbird

Personally i've never putuch faith in Vizards equations/calculations.

One man had both David Vizard and Mike Jones each submit their cam specs for a combination.

Results were almost identical. They use different equations but arrived to the same conclusion.

Vizard specs
------------------
Here is what my Cam Master program calls for with the spec of engine being built.
In. Lobe
330 @ 0.012 tappet lift
310 @ 0.020 "
282 @ 0.050 "
0.525 lobe lift
0.922 lift after lash with 1.8/1 R/Ratio
Ex. Lobe
346 @ 0.012 tappet lift
324 @ 0.020 "
294 @ 0.050 "
0.500 lobe lift
0.830 valve lift after lash with 1.7/1 R/Ratio
LCA 110.5 Required.
Note:- If Mike only grinds LCA's to whole numbers as is the case for most cam grinders then I will opt for 111 LCA.


Mike Jones specs
------------------------

Intake: 332 @.012"(Seat), 312 @.020", 284 @.050", .525" lobe lift, .925" net valve lift w/1.8 RR
Exhaust: 344 @.012"(Seat), 326 @.020", 295 @.050", .497" lobe lift, .825" net valve lift w/1.7 RR
Hot Lash .020"/.020"
LSA 111
Mike Jones

[PAUL K]

Originally Posted by pastry_chef

One man had both David Vizard and Mike Jones each submit their cam specs for a combination.

Results were almost identical. They use different equations but arrived to the same conclusion.

Vizard specs
------------------
Here is what my Cam Master program calls for with the spec of engine being built.
In. Lobe
330 @ 0.012 tappet lift
310 @ 0.020 "
282 @ 0.050 "
0.525 lobe lift
0.922 lift after lash with 1.8/1 R/Ratio
Ex. Lobe
346 @ 0.012 tappet lift
324 @ 0.020 "
294 @ 0.050 "
0.500 lobe lift
0.830 valve lift after lash with 1.7/1 R/Ratio
LCA 110.5 Required.
Note:- If Mike only grinds LCA's to whole numbers as is the case for most cam grinders then I will opt for 111 LCA.


Mike Jones specs
------------------------

Intake: 332 @.012"(Seat), 312 @.020", 284 @.050", .525" lobe lift, .925" net valve lift w/1.8 RR
Exhaust: 344 @.012"(Seat), 326 @.020", 295 @.050", .497" lobe lift, .825" net valve lift w/1.7 RR
Hot Lash .020"/.020"
LSA 111
Mike Jones

That is interesting.... How did that come about?

[pastry_chef]

Originally Posted by PAUL K

That is interesting.... How did that come about?

It was done on Speedtalk a few years back. Both Vizard and Jones said those were the the legit results.