7,500rpm+ with hyd lifter?
Jessica,
I don't know you personally, but I have seen you throw some info in to some other technical threads with no technical info to back it up. Now from the comments of some other well known rebutable members on this board, (Not ones that I feel are internet Hero's) it seems you hang with a pretty knowledgable crowd. But please, enlighten us with a little more info on yourself (not interested in the bra size stuff) but your engine backround. Specifically how you have come to those numbers and in other threads, how you come to those conclusions.
As far as your direct statements, with out info to back them, they do none of us any good. Personally I don't like taking things to heart because someone tells me so. I like to know why and how.
BTW, I went to school with a girl named Jessica. She was in small engines, advanced auto and went on to a automotive specialty school. You didn't grow up in the Monterey California area did you?
I don't know you personally, but I have seen you throw some info in to some other technical threads with no technical info to back it up. Now from the comments of some other well known rebutable members on this board, (Not ones that I feel are internet Hero's) it seems you hang with a pretty knowledgable crowd. But please, enlighten us with a little more info on yourself (not interested in the bra size stuff) but your engine backround. Specifically how you have come to those numbers and in other threads, how you come to those conclusions.
As far as your direct statements, with out info to back them, they do none of us any good. Personally I don't like taking things to heart because someone tells me so. I like to know why and how.
BTW, I went to school with a girl named Jessica. She was in small engines, advanced auto and went on to a automotive specialty school. You didn't grow up in the Monterey California area did you?
There is more to it than just the lifter right? Spring pressure has some influence doesnt it? What can cause a collapsed lifter? Hi spring pressure and hi rpms right? So its not just a matter of the lifter, but I think thats been covered in the thread.. not sure.
Those cars that ran to 9500 rpms .. what was the whole setup? What cam and lobes and what springs and rockers? How about oil pump out of curiosity? We need more information about the setup.
Those cars that ran to 9500 rpms .. what was the whole setup? What cam and lobes and what springs and rockers? How about oil pump out of curiosity? We need more information about the setup.
TECH Fanatic
Joined: Jun 2002
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From: Upstate NY
There is more to it than just the lifter right? Spring pressure has some influence doesnt it? What can cause a collapsed lifter? Hi spring pressure and hi rpms right? So its not just a matter of the lifter, but I think thats been covered in the thread.. not sure.
Those cars that ran to 9500 rpms .. what was the whole setup? What cam and lobes and what springs and rockers? How about oil pump out of curiosity? We need more information about the setup.
Those cars that ran to 9500 rpms .. what was the whole setup? What cam and lobes and what springs and rockers? How about oil pump out of curiosity? We need more information about the setup.
There were some fairly good articles published about the original Cadillac CTS-R race engine. It was basically a destroked LS7 (5.7L) running LS7-style heads a couple of years before the LS7 made production. The first time out the rules allowed them 7900 rpm, I believe. They finished 1-2. The second-place finisher came from dead last to second in the race. They immediately got a weight and rpm penalty from the sanctioning body. I suspect if they planned to run 7900 in an endurance race they would have developed the HR valvetrain to work 15% or so above the mandated rev limit.
I'd dig out the article, but it's a few years old and I'm lazy. It may have been in RACE Tech or Racecar Engineering.
It's always the complete system that has to work together. That is especially true when you want to reach for the edge of the envelope. 9000+ with hydraulic rollers seems to me to be pretty close to the edge of that envelope.
My $.02
Thanks Jon.. I can totaly understand the "whole package" idea behind it. I feel better about the lifter making it to 8k. Hopefully the springs and other parts are up to the task..
