Flat tappet lifter failure

[Alan Roehrich]

Originally Posted by john ancona

All this type of unfounded information ,that is just flat wrong again ,and again is not welcome by many ,simply put we are already using billet camshafts ground for solid lifters, that are DLC coated in order to run valve spring pressures well above the limits of a solid lifter at what is already what many say on this site as expensive , so maybe the uninformed may want to go do some of there own research as to the cost before they make false statements , I have said this before many times on this site since 1985 car manufactures have went to roller cams , and before all you opinionated racers express your own views telling others to run a car with roller lifters from the factory ,you may be better served by understanding there is a reason as to why many like running the older cars

Really?


And you have how many class wins with your big block Stock Eliminator engines? Because I have more than 1-2.


Oh, and I have a 9500 RPM+ 396-375 Super Stock engine as well.


Maybe YOU can't make a flat tappet Stock Eliminator engine run. That does not mean the rest of us can't. There are a ton of VERY fast big block Chevy stockers out there running flat tappet cams and having zero problems. Maybe you should ask yourself why YOU can't.

[john ancona]

Originally Posted by Alan Roehrich

Really?


And you have how many class wins with your big block Stock Eliminator engines? Because I have more than 1-2.


Oh, and I have a 9500 RPM+ 396-375 Super Stock engine as well.


Maybe YOU can't make a flat tappet Stock Eliminator engine run. That does not mean the rest of us can't. There are a ton of VERY fast big block Chevy stockers out there running flat tappet cams and having zero problems. Maybe you should ask yourself why YOU can't.

Maybe you ,and others would have some creditably if you replied with facts rather to what YOU wrote that is flat wrong , maybe you should check your facts as to if I can make a flat tappet run in stock with zero problems ,I have had not one problem in well over a dozen years running my 396 375 hp in stock @ 8200

[Alan Roehrich]

Originally Posted by john ancona

Maybe you ,and others would have some creditably if you replied with facts rather to what YOU wrote that is flat wrong , maybe you should check your facts as to if I can make a flat tappet run in stock with zero problems ,I have had not one problem in well over a dozen years running my 396 375 hp in stock @ 8200

But you're saying that roller lifters and roller cams are necessary for Stock Eliminator..


Maybe you should help Terry fix his problems.






What I wrote is factually correct.


Converting to roller cams and lifters will require entirely new lobe designs.


Oh, and you can then use even stronger valve springs, turn more RPM, break something else, and cry for another rule change.

[john ancona]

Originally Posted by Alan Roehrich

But you're saying that roller lifters and roller cams are necessary for Stock Eliminator..


Maybe you should help Terry fix his problems.






What I wrote is factually correct.


Converting to roller cams and lifters will require entirely new lobe designs.


Oh, and you can then use even stronger valve springs, turn more RPM, break something else, and cry for another rule change.

Maybe you should keep you Ill-founded opinions to your self ,you appear to lack any knowledge about what you are talking about ,put simply what you wrote is not factually correct ,you maybe better served to keeping your opinions to your self .

[Alan Roehrich]

Originally Posted by john ancona

Maybe you should keep you Ill-founded opinions to your self ,you appear to lack any knowledge about what you are talking about ,put simply what you wrote is not factually correct ,you maybe better served to keeping your opinions to your self .

You know, that's actually decent advice. You should take it.

[Stan Weiss]

Ignoring pushrod angle against the lifter. A flat lifter / cam really produces no side loading.


Again ignoring pushrod angle against the lifter. A roller lifter / cam will produce side loading. Look at pressure angle.


While a roller lifter doesn't the max velocity limit of a flat lifter, at does have other limits. Again look at pressure angle.



Stan

[Alan Roehrich]

Originally Posted by Stan Weiss

Ignoring pushrod angle against the lifter. A flat lifter / cam really produces no side loading.


Again ignoring pushrod angle against the lifter. A roller lifter / cam will produce side loading. Look at pressure angle.


While a roller lifter doesn't the max velocity limit of a flat lifter, at does have other limits. Again look at pressure angle.



Stan

Yep.


And they haven't gotten into the differences in lifter diameter, lifter wheel diameter, or what all of that will do to the rest of the valvetrain, like the rocker arms, rocker studs, rocker stud bosses......




As usual, a lot of people THINK they know. Then they'll be stunned at the can of worms they opened. They fail to understand, they do not want that genie out of the bottle, because it will NEVER go back in.

[Casey Miles]

Maybe taking a couple of steps backwards would help Stock more than of going with parts that would cost more money and people with deeper pockets having advantages. Stock as stock, hydraulic lifters back where they belong in the engines that came with them from the factory. Have a valve spring pressure rule to where an engine family can run +30 lbs from design.
With the changes, there wouldn't be a big need of the AHFS, cars would fall back to the performance levels that were expected.
If you haven't noticed, but the age of the racers isn't getting any lower. New blood can't afford a Stock prepared car because of rules that don't make sense about a stock car.
This is just my opinion, I don't need hate replies.

Casey Miles
248H Stock

[L.Fite]

Originally Posted by Stan Weiss

Ignoring pushrod angle against the lifter. A flat lifter / cam really produces no side loading.


Again ignoring pushrod angle against the lifter. A roller lifter / cam will produce side loading. Look at pressure angle.


While a roller lifter doesn't the max velocity limit of a flat lifter, at does have other limits. Again look at pressure angle.



Stan

So can you elaborate?
Feel free to PM...
I'm here to learn.

[L.Fite]

Is this really a spring pressure problem, or a material quality issue?
I seem to hear others having similar issues with street/strip type cam profiles.
Wondering if it is not a more widespread problem than aggressive profile / high spring pressure that magnifies the problem?