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Max Rpm

This is a discussion on Max Rpm within the Internal Engine forums, part of the LSx Technical Help Section category; So i was doing some light reading and found out that we can get our engines to put out 7000RPM... ...

  1. #1
    Member Phlash_riot's Avatar
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    Max Rpm

    So i was doing some light reading and found out that we can get our engines to put out 7000RPM... rather we can build them to handle it??? What do you need beside i would assume forged pistons and connecting rods????

    What about 6800RPM is that the same or less work?

    How high could you get the things? Is it worth it?

    Just curiosity killing the cat

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    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    let's see

    valvetrain upgrades (valve springs, titatnium retainers, pushrods, lighter valves (not absolutely necessary)
    forged crank is nice addition, but not absolute necessity
    rod bolts (if you use stock rods)

  3. #3
    Jesus died to save you! Killer_bluebird's Avatar
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    valve springs, titatnium retainers, pushrods are a must. Rod bolts will buy you some extra insurance especially in earlier LS1 as they are known to fail. Run 1/2 quart extra oil. Most spun bearings are due to lack of oiling either during acceleration or High cornering forces.
    Quote Originally Posted by Phlash_riot View Post
    How high could you get the things? Is it worth it?
    I have my limiter set at 7K. Is it worth it? Not on a stock cam.
    2000 NBM Camaro Z28
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    Nitrous Tuner LS2Tuner's Avatar
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    Quote Originally Posted by Phlash_riot View Post
    So i was doing some light reading and found out that we can get our engines to put out 7000RPM... rather we can build them to handle it??? What do you need beside i would assume forged pistons and connecting rods????

    What about 6800RPM is that the same or less work?

    How high could you get the things? Is it worth it?

    Just curiosity killing the cat
    The #1 determining factor is the camshaft..........It will decide if your going to make high rpm horsepower.If you are running a stock cam all your doing is wasting time trying to rev it that high, it's p[ower band is done way before 7000 .......But there is a trade off when you run a "big" cam in a street driving car......You'll need a "loose" convertor not to mention you'll bottom end tq. will be by by.
    If it is something you street race alot it can benefit you because your low end tq. is gone which causes tire spin....
    That is why with a nitrous grind cam they will loose 35 ft. of tq. to gain 8 h.p. at 6500rpm.

    Most people don't know but 95% of the time your gaining more tq. than h.p........So that is creating soooo much low end tq. it doesn't benefit you cause with a street tire or even a 10.5 tire you can't "hook" that much tq.; there fore you run a "big" cam or a Nitrous grind to help bleed off some low rpm cyl. pressure.

    Many engine builders have done extensive testing on tit. retainers.......And from researching all there testing I haven't seen proof that it is worth the $......Unless your on a unlimited budget than go for it.Pushrods do flex I've personally seen testing on that and I always spend $ on SmithBrothers....... At least 0.80" wall thickness and if your buzzing the shit out of it or a kit over 200h.p. I'd run 0.120" wall pushrod.
    Also if your planning on buzzing it invest in a good set of rockers..
    Fordged pistons won't help on the rpm deal thay are actually heavier than a hyp. or cast piston....Rod ratio will help determine max rpm....Basically the longer the rod the easier it is on everything to rpm.
    Hope I helped I tried to put it as basic as posible to explain.
    Don't be afraid of the bottle!!! Be afraid of your tune!!!

  5. #5
    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by Phlash_riot View Post
    So i was doing some light reading and found out that we can get our engines to put out 7000RPM... rather we can build them to handle it??? What do you need beside i would assume forged pistons and connecting rods????

    What about 6800RPM is that the same or less work?

    How high could you get the things? Is it worth it?

    Just curiosity killing the cat
    a C5 Z06 has a ls1 bottom end and those motors spin up to 6800 i believe.
    my car spins up to 6800 also. that rpm is still what alot of people call safe. going higher all bets are off.
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
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