Ahhhhh, no big deal 12many!
This one in my experience, and I am guilty of it too!The one which is closest to what you thought you wanted?
In my case, price is irrelevant. In all fairness, timely vendor response weights heavily. Just on e-mail response alone Jones, Isky to date are at the top. Bullet takes for ever. There are others I'm eyeballing. Yes calling is likely better in some cases. For me I'm not requesting a recommendation with no idea the ballpark I want or think I need to be in. I'm conservative on specs, so initially the cam Jones spec'd seems on the big side. To most I see it's not. I gotta see what others come up with, compare it to my chosen experts methodology (Vizard: How To Build Horsepower) for specing a cam yourself. I'm one that enjoys doing what I can myself, but am smart enough to know I don't know as much as I think I know! Its just gratifying to think and do this stuff as much as I can.Soooo...... after one calls around to some cam suppliers and/or fills out on line spec sheets, and gets a number different responses...... how do you determine which one is “best” for any given application?
Eeny meeny miny moe?
The one which is closest to what you thought you wanted?
The supplier who has the most clout?
The best price?
In my case, price is irrelevant. In all fairness, timely vendor response weights heavily. Just on e-mail response alone Jones, Isky to date are at the top. Bullet takes for ever. There are others I'm eyeballing. Yes calling is likely better in some cases. For me I'm not requesting a recommendation with no idea the ballpark I want or think I need to be in. I'm conservative on specs, so initially the cam Jones spec'd seems on the big side. To most I see it's not. I gotta see what others come up with, compare it to my chosen experts methodology (Vizard: How To Build Horsepower) for specing a cam yourself. I'm one that enjoys doing what I can myself, but am smart enough to know I don't know as much as I think I know! Its just gratifying to think and do this stuff as much as I can.
Mike has his own propriatory software that spots out cam specs based on input from the user. And his cams are ground without the traditional "master lobe" so he can grind to any spec needed... No limits.I *THINK* that his 316 number is measured in a different manner.
Been awhile since I've talked with Mike but I remember him not being too excited about the advertised numbers for some reason.
Should have written that down when we were talking about it.
12many could go to speedtalk.com and join there and ask mike on the forum. Then you'd have a public answer about his numbers and why he called out what he did.
Found the explanation there, so that takes care of that. Still a pain trying to compare different manufacturers specs. Getting there though! From a post at Speed-Talk by Mike Jones:I *THINK* that his 316 number is measured in a different manner.
Been awhile since I've talked with Mike but I remember him not being too excited about the advertised numbers for some reason.
Should have written that down when we were talking about it.
12many could go to speedtalk.com and join there and ask mike on the forum. Then you'd have a public answer about his numbers and why he called out what he did.
I’ve looked at some old Ultradyne lists and the durations on the solids show duration @.020” and on another list it shows “seat duration .020” so I guess it’s a lost cause trying to directly compare. I know most don’t give overlap specs anymore either and have read contradictory statements about various specs being useless etc. but I want to do side by sides, run the calculation etc. I’ve read Vizard states in general actual duration on solids is 12-15 more than shown @.020” but still......I understand the logic in Mikes philosophy........ it just doesn’t make for easy comparisons between his grinds and others(not that he cares about that).
Are all these cams hardened the same? Likely not a big issue with the roller I have planned but I'm curious.
Unsure how .050 or .020 are deceptive. They are a tool for mapping and comparing the lobe ramps.
I.e. 2 cams have the same duration at .050 yet different durations at .020.