Re: Flat tappet lifter failure
 

So you don't support roller lifters in stock? My apology if thats the case, but It does appear you have success without having to run roller cams and lifters.
What I dont understand is why are some having success without running tool steel coated lifters and some not. Does it have to do with the inferior cams or lifters not being able to tolerate lifters bores not aligned correctly?
Is the movement to go to roller lifters and billet cams to try to save cost? If so, why isn't there a movement to go to stock ring width? You could almost buy a a set of billet cam and lifters for what some have into ring packages with spacers. Evolution has put us in this situation, and it appears there is no going back. But for every new rule change, such as a roller lifter change, it would bring in a cost that those with money would excel, and those without would be farther behind the gap.

Re: Flat tappet lifter failure
 

Is everyone running the same cam / same manufacturer? In most cases looking at the lift plots of different cams really doesn't tell you anything. You need to look at velocity, acceleration and finally jerk to see what the differences might be.

Are different people running different shift points? Remember the loads and force don't increase linearly.


Stan

Re: Flat tappet lifter failure
 

Straight from the VPUTUS !!!!!! " There's a Time in our Time when the Time is here ,to move forward in Time ,and that Time to run roller cams is the Time to take the Time to run SS, which has roller cams since its beginning in Time and Time to leave Stock as it is in Time !! " Cheers !!!

Re: Flat tappet lifter failure
 

The cat is already out of the bag when it comes to stock eliminator. Not much on a stocker is stock anymore. I dont race stock but do watch what happens to the class.
Lots has change over the years. Lately the lifter rule to allow solid lifters in an engine combo that was hydraulic. Next was the new rule that allowed roller rockers. How many still run hydraulics and stock rockers. Probably not many. There was also the spring rule. Stock diameter any pressure. most of the later model cars that run stock now have roller lifters. I can see that change being approved in the near future for the older combos.

Re: Flat tappet lifter failure
 

Pretty sure it already has. Can you say Dragpac, Cobrajet, or Copo?

Re: Flat tappet lifter failure
 

Ok please don’t roast me. I’m just asking/learning. Say you have 2 cars that fall in the same class. One is a factory roller combo. One is a flat tappet combo. If you give the flat tappet guy a roller cam. Didn’t you just give him a way to make more power? A roller cam can run a more aggressive ramp and way more spring pressure. How do you even that out? Please don’t say AHFS. You can’t just pull a number out of your behind either. Because not every combo will pick up the same. So you can’t just throw “X” hp on everybody that switches. Then do you make everybody switch to a roller cam even if they don’t have trouble with flat tappets? Or do you have 2 factors in the book. One for flat tappet one for roller. Or do you knock hp off all the factory roller cam combos. Then again how much? Sounds like a big ol can of worms. Where no matter what someone is going to like it. And others won’t.

For the record. Full disclosure. My junk is slow. I didn’t race it much before I got hurt working and had to stop racing. I didn’t plan to be off this long. But I have bought a BUNCH of parts to get faster if I can ever get back in the car. My combo is a factory roller. But no matter what they decide. I’ll probably get my as handed to me in a heads up race. So it doesn’t matter one way or another for me. So I’ll keep my opinion to myself. But I’ve read a few of these threads now. And I always wonder how you’d make it even.

Re: Flat tappet lifter failure
 

Just like the approved heads, you’ll pay a penalty. That could be a costly penalty.
Butttttt NHRA has already signaled on this one.

Re: Flat tappet lifter failure
 

Ya that’s what I kind of figured. But that’s a lot of different combos to figure out how many hp they get hit with for switching to a roller. Then do they make everyone change or have 2 factors flat &roller. We know NHRA is trying to cut labor costs. Look at tech. My bet is it’s a combination of the complaints that will follow and labor costs. Are what’s stopping them more than letting stock slip away a little more.

Re: Flat tappet lifter failure
 

Yeah, let's take a look at how THAT turned out. The original intent of that ruling was that certain (yes certain not all) combos could use an "approved aftermarket aluminum head" with a 10 HP penalty. However, after the ruling went through "someone" in the NHRA Ivory Tower decided that they should be considered different combos when it came to the AHFS. Now there are combos where the aftermarket head is factored less than the original head. How'd that happen? No more flat 10 HP penalty, different combo.

Re: Flat tappet lifter failure
 

It will come down to you have to computer register and answer a number of questions and the computer will give you your HP / weight. Now lets say you hurt that engine and show up with your backup engine which has different heads, cam etc., just imagine the fun when you get to the track and try and change your entry. :eek:

Stan