That is a much better article than the 1st; it offers much more detail on the 'whys'. Many thanks!
If you look at the graphs, the wider LSA has the 'flatter' torque band but it is lower overall (in the range where the dyno numbers are valid). That is what the 'visible V8' model in my head says it should be. But it is a relative % flatness thing; may or may not what you want in the given application.Of course, there’s conflicting info in the article.
When they’re discussing the graphs, they talk about how the tighter lsa has the wider powerband.
When they’re listing the pros and cons of narrow vs wide, they say the wide lsa has the broader powerband.
I feel it’s just another one of those “it depends” items.
Isn't it nice to talk to an old-school guy who's willing to take the time to hear all about your build and what you're doing so he can give you the best possible product? Interrogation! LOL I love it!The " calling cam experts " title of this thread is also the answer.
I had an unground lobe billet for my 48 degree heads and called Bullet.
It's been a couple years , but I seem to recall Ken as being the guy I spoke with.
We spent at least 20 minutes on the phone as he interrogated me.......I wanted a lot , as the car would see street duty too.
He asked about head flow numbers , compression , gearing , transmission , car weight etc. etc.
He decided on a 626 lift , 260 & 268 @.050 with a 106 center line.
I degree'd the intake lobe to 102 as recommended and tightened up the lash a tad , it seems to work very well.
Crisp street manners.....instantaneous throttle response and it revs as high as I need it to.
I didn't have the $$ to dyno the motor , but it pulls past 7000.
Even if there were shelf grinds for the 48 degree deals , I would have still called someone in the business and picked their brains.
if you're not doing anything call and chat him up see what he says? You don't have to buy nothing...If you look at the graphs, the wider LSA has the 'flatter' torque band but it is lower overall (in the range where the dyno numbers are valid). That is what the 'visible V8' model in my head says it should be. But it is a relative % flatness thing; may or may not what you want in the given application.
Well yes and no.. I emailed Jones cams on their form with very complete info on engine and application, plus what I was looking to do application-wise, and got a cam grind anyone would have picked out of a catalog. When I asked a straightforward question, I got no answer. Not impressed at all.
To be fair, I'll give it a few more shots with other custom grinders and will hope for a better outcome, but I know far more about cams from direct experience, readings, and by reading posts by experienced 'knuckleheads' like here on FABO.
The other thing about custom cams is....... not everything needs a custom cam.
Sometimes what’s in the catalog will work just fine.
And....... without testing multiple cams.... who’s to say which is actually the “best”.
That thought occurred to me when looking at the torque curves in the 2nd article.....how much was due to just that. But I have no way/idea to separate out that effect from the rest. The bump in the upper RPM torque curve with wider LSA is what has me a bit mystified..... not sure why that happens.those mag articles show more about intake close than about lca
what would happen if you ran all three at the same intake close (given it screws up the other events)
Being in business myself, and never having enough time, I just don't tend to do things that can potentially waste the time of others. (Well, besides writing posts on FABO LOL.) Even going to the local machine shop, I don't waste their time until I am actually in a project and getting ready to buy some services. Just my philosophy....if you're not doing anything call and chat him up see what he says? You don't have to buy nothing...
In most cases I have to 100% agree I don't start talking about things until I have the money for it. Ted of PIR is quite the exception.. absolute old school guy who absolutely loves talking about this stuff and giving great advice and going over different scenarios. Quite honestly I'd rather you just come in and sit down and chat with me for a while is what he told me the last time I talked to him. For the longest time when he had the shop in what is now extremely trendy District of Portland I would always say why don't you just sell the property I mean and go to Hawaii and live it out? His passion for Hot Rodding and Building engines and talking to people about their engines and building them is what he loves. Was ready to retire LOL if you want to call it that a few years ago so he built, hand-built! A custom shop right next to his house out in the country where he took all of the highest end best pieces of his equipment and brought them basically home. Now he just does custom work only and all the cool stuff. it's almost like denying him his Passion by not calling him for advice...Being in business myself, and never having enough time, I just don't tend to do things that can potentially waste the time of others. (Well, besides writing posts on FABO LOL.) Even going to the local machine shop, I don't waste their time until I am actually in a project and getting ready to buy some services. Just my philosophy....