engine redline

[mkory]

What limits engine redline in our engines? I realize that redline is going to be different for all engines, but is there any deciding factor in our engines that won't let it rev higher? I saw a video from ka-t.org, and the guy who was dyno-ing his car took it up to a little over 7500 rpms... sweet sound.

[corn322]

7500 rpm is probably the limit before stock internal parts start breaking, or valves start floating.

[mkory]

so... if you build your engine while turboing it, what all is required to replace to make it rev higher?

[Xracer]

you dont want to rev a stock internal KA past 7k. anthing beyond that is putting a laod of stress on your internals as the piston speeds are really high. i could go into mathmatical equations and stuff but im done wiht school for today. but anyways. 7500 isnto much of a problem if you have some stiffer valve springs and stuff. a n/a KA is way out of its power band above 7k. it ends around 6500. a turboed ka is a differnt story. the KA isnt meant to rev but if you really want to rev it high your going to need stronger internals.

[mkory]

I'm just thinking about when I go turbo. Start with stiffer valve springs, go with some lower compression pistons/ shorter stroke rods... Then what?