Roller rockers

mannymen · 01-20-2011, 12:45 PM

In regards to the solid lifters being an issue: How is it that bracket racers are running near .680 -.700 lift mechanical cams and not breaking lifters???

The factory rocker arms with the higher spring pressures I understand, but the lifters I don't.

A very good friend of mine was running a custom (BBC) high lift mechanical/solid cam from Crower and never had any issues with his$100 set of lifters breaking. He would easily get 400 passes on them shifting in the mid 7k range.

Chad Rhodes · 01-20-2011, 01:03 PM

Quote:

Originally Posted by mannymen

In regards to the solid lifters being an issue: How is it that bracket racers are running near .680 -.700 lift mechanical cams and not breaking lifters???

The factory rocker arms with the higher spring pressures I understand, but the lifters I don't.

A very good friend of mine was running a custom (BBC) high lift mechanical/solid cam from Crower and never had any issues with his$100 set of lifters breaking. He would easily get 400 passes on them shifting in the mid 7k range.

nothing to do with lift, all has to do with ramp rate. if you have 260@.050 duration on a .750 lift cam that is one thing, now if you have .300 less lift your ramp rate is increased dramatically with the same duration

Jeff Lee · 01-21-2011, 01:42 AM

Quote:

Originally Posted by mannymen

In regards to the solid lifters being an issue: How is it that bracket racers are running near .680 -.700 lift mechanical cams and not breaking lifters???

The factory rocker arms with the higher spring pressures I understand, but the lifters I don't.

A very good friend of mine was running a custom (BBC) high lift mechanical/solid cam from Crower and never had any issues with his$100 set of lifters breaking. He would easily get 400 passes on them shifting in the mid 7k range.

That's why anybody can build a fast bracket racing type engine.
Likewise, my 3160+ weight stocker with .457" maximum lift cam and a little 600 CFM Autolite carb can beat most Dominator equipped .700" lift engines which weigh 300 #'s less. Of course that's part of the fun...

Jim Bailey · 01-21-2011, 07:34 AM

One of my favorite things to discuss is cryogenic processing. I love when someone tells me I tried that a couple years ago and it didn't work. Well, a couple years ago you ran your computer with dos.....cryogenic processing ain't what it use to be! Additionally, all cryo is not the same! There are new machines,(very important), new programing available, and unlimited control over the process. Some new machines never directly expose the parts to the liquid nitrogen. It even has cause some manufactures to say their parts are already cryo'd. OK, but was it done correctly? Ask what machine was used, old it is, and how long did the process take. Ask questions. ( you can't cryo a part, correctly, in less than 3 days -72 hours-).We've developed programs that have eliminated roller lifter breakage in Pro Stock, eliminated valve spring breakage, eliminated timing chain stretch, and done a very good job with rear end gears and stock stamped steel rockers, among other parts that fail. I will tell you that dry ice in a bucket isn't used, and that all parts are treated with different programs, and, I can make your high speed drill bits last 10 times longer - guaranteed. JB.

Jeff Lee · 01-21-2011, 03:34 PM

All very good points Jim!

donc · 01-22-2011, 09:44 AM

Mr. Bailey, i think is right on target with cryogenics done properly it works very well. ive also used the metaltt lax process . what i like about metal lax is before you treat the part it gives you a graph showing how tight the grain structure is before you start, then what it is after a cycle. i know on titanium it machines better and holds up longer. for example, titanium rods in a sprint car used to change , every 2 weeks. after metal lax , 6 weeks without breaking one. anyone else on this?

01-20-2011, 12:45 PM	#1
mannymen Senior Member Join Date: Apr 2003 Posts: 728 Likes: 5 Liked 13 Times in 7 Posts	Re: Roller rockers In regards to the solid lifters being an issue: How is it that bracket racers are running near .680 -.700 lift mechanical cams and not breaking lifters??? The factory rocker arms with the higher spring pressures I understand, but the lifters I don't. A very good friend of mine was running a custom (BBC) high lift mechanical/solid cam from Crower and never had any issues with his$100 set of lifters breaking. He would easily get 400 passes on them shifting in the mid 7k range. __________________ N/A

01-21-2011, 07:34 AM	#4
Jim Bailey Senior Member Join Date: Aug 2004 Posts: 674 Likes: 15 Liked 584 Times in 94 Posts	Re: Roller rockers One of my favorite things to discuss is cryogenic processing. I love when someone tells me I tried that a couple years ago and it didn't work. Well, a couple years ago you ran your computer with dos.....cryogenic processing ain't what it use to be! Additionally, all cryo is not the same! There are new machines,(very important), new programing available, and unlimited control over the process. Some new machines never directly expose the parts to the liquid nitrogen. It even has cause some manufactures to say their parts are already cryo'd. OK, but was it done correctly? Ask what machine was used, old it is, and how long did the process take. Ask questions. ( you can't cryo a part, correctly, in less than 3 days -72 hours-).We've developed programs that have eliminated roller lifter breakage in Pro Stock, eliminated valve spring breakage, eliminated timing chain stretch, and done a very good job with rear end gears and stock stamped steel rockers, among other parts that fail. I will tell you that dry ice in a bucket isn't used, and that all parts are treated with different programs, and, I can make your high speed drill bits last 10 times longer - guaranteed. JB.

01-21-2011, 03:34 PM	#5
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: Roller rockers All very good points Jim! __________________ Jeff Lee 7494 D/S '70 AMX

01-22-2011, 09:44 AM	#6
donc Junior Member Join Date: Dec 2010 Posts: 15 Likes: 0 Liked 0 Times in 0 Posts	Re: Roller rockers Mr. Bailey, i think is right on target with cryogenics done properly it works very well. ive also used the metaltt lax process . what i like about metal lax is before you treat the part it gives you a graph showing how tight the grain structure is before you start, then what it is after a cycle. i know on titanium it machines better and holds up longer. for example, titanium rods in a sprint car used to change , every 2 weeks. after metal lax , 6 weeks without breaking one. anyone else on this?