I get hyd and mechanical, even Road lifters(sp)
Roller lifters.
Have many question, but let's start with a simple on?....
Does the roller wheel need to be different between cast/steel/ billet.
Wheel diameter is somewhat standardized at 0.75" (edit) for majority of applications. But the larger diameter wheels roll over an obstruction easier, such as an aggressive lobe. Again with the higher end lifters suited to bigger cams.
A narrow wheel reduces friction (less contact patch/square inches)...but you need a certain amount of width in order to prevent too much load in one narrow spot on the lobe (think of a cutting tool on a lathe). Additionally you need enough wheel mass/material for stability and so you don't crush the wheel...fun balancing act for the engineers.
For your last question - more balancing act stuff-you want the smallest, lightest, strongest wheel that satisfies majority of the applications. Once someone gets to the level of smashing the $400 lifters, they go to the $700 lifters...then the $1200, and so on.
next question.
What is this reverse roller lifter i keep hearing about.
what does it do and why/!??
Irregardless is not a word.
I'm not bringing a lunch today so by 2 I'm going to be hungry!!...The reason the .750 wheel is the "industry standard" is because that is the biggest wheel you can fit in an .842 body. In other words, because Chevrolet architecture is garbage, we all get garbage. That's why the .750 wheel is used.
A narrower wheel on the lobe will INCREASE the unit loading and cause MORE friction.
Your last statement is just dead wrong. It's not a balancing act of anything.
You run the biggest body with the biggest diameter wheel you can fit in there.
Ok maybe it's the way the cam is ground????
I found it by the way and here is the post.
many of us were thinking of a conversion to a mech flat tappet so ignore all the lifter size stuff
what matters is what was said on my post 79 about the torque advantages of an inverse flank roller cam- no one else takes the time to final grind and spark out with a 5" wheel
several other "inverse" series are barley inverse - as much as can be obtained with the standard 18 " wheel which is not much
Mikes program takes all this into account
cheeers
Maybe a little bit more explanation on this.
in·verse
/ˈinvərs,inˈvərs/
Learn to pronounce
adjective
noun
- opposite or contrary in position, direction, order, or effect.
"the well-observed inverse relationship between disability and social contact"
- something that is the opposite or reverse of something else.
"his approach is the inverse of most research"
OK that's the best i can do........
so how does this.....backward? lobe? work?....look like?
And how is it an advantage????????
... Thank you for the cheeseburger...If you picture a cam lobe with flat flanks leading to the nose, and then imagine that same flank wit ha point on it where the flank itself would look like it has an a point where the lifter actually looses lift (IIRC the lifter literally doesn't lose lift at that point but the inverse radius basically stalls the lift rate.
That's the only way I can explain it. Rather than a flat flank, the flank has a dip in it, for lack of a better term.
As to why it is better, I'm not sure. I do know there are cases where it works. What parameters those may be I can't say.
... Thank you for the cheeseburger...
Way more trick then i will ever use.....seems kinda goofy to me.
But thanks for the explanation!
I don't know where that work came up in this thread, but thanks for you time.