Hyd Roller lifters that will run past 7k Rpm's
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Hyd Roller lifters that will run past 7k Rpm's

  1. #1
    B.A.M aka "Black Azz Mike 396_Ways_To_Spit's Avatar
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    Default Hyd Roller lifters that will run past 7k Rpm's

    I stumbled upon this earlier. What do you guys think?


    If there is one performance limitation to hydraulic roller lifters it is the maximum rpm capability they can maintain in race applications. The internal hydraulics of standard roller lifters are susceptible to pumping up around 6200-6500 RPM, causing horsepower robbing valve float along with the possibility of severe valvetrain damage. At this point there are two options for racers: 1) Switch to a solid roller setup, which requires various upgrades and routine maintenance or 2) Upgrade to a Lunati High RPM lifter and get the RPM capabilities similar to a solid roller with the long, maintenance free life of a hydraulic roller.

    These aren’t your “I just want to cruise around town going the speed limit” kind of valvetrain parts. We are talking about a hydraulic lifter that can withstand 10 million (you read that right) cycles on a Spintron (valvetrain dyno) and operate in RPM ranges over 7000 RPM. What makes these lifters able to excel in areas where competitor’s hydraulic lifters would have failed? Because we only use the best of the best and cut no corners to ensure our customers get what they pay for. The construction begins with a Lunati propriety steel alloy body that is completely micro polished for a smooth microstructure finish. This finishing process reduces friction between the lifter and lifter bore, and works in conjunction with a precisely controlled internal oiling system and strict internal tolerances. These revolutionary hydraulic internals can withstand elevated valve spring pressures, up to 575lbs., that would make our competitors tremble. We didn’t stop there with the innovations. We then incorporated a .750” diameter lifter wheel which is .050” larger than “leading” competitor’s products to give you the most out of your aftermarket camshaft profiles.

    In stock now for Small Block Chevy, Big Block Chevy and GM LS1/LS2/LS6 owners who want the best captured link bar style hydraulic roller lifters available for their race application.


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    Super Moderator HammerDown's Avatar
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    steelcomp was here
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    The Morel's in my blown 489 went 6700 and were still pulling. No signs of anything but HP.
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    Senior Member wagspe208's Avatar
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    Lunati makes decent stuff.
    I have a couple of questions, though...
    1) If you want to spin past 7g, why are you considering a hydraulic lifter?
    2) Just because the lifter will work without pumping up, you still have to close the valve without seat bounce. So, you still need 500+ open pressure (with relatively mild lift) depending on application. Will the lifter be cool with that? (I'd assume, just asking) DOOP..just read the whole deal...run em.
    3) I bet you do not save money in the long run with these pieces. Add it up...you might.
    Buy them and give them a whirl.
    Good luck on the porject.
    Wags

  7. #5
    steelcomp was here
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    Quote Originally Posted by wagspe208 View Post
    Lunati makes decent stuff.
    I have a couple of questions, though...
    1) If you want to spin past 7g, why are you considering a hydraulic lifter?
    2) Just because the lifter will work without pumping up, you still have to close the valve without seat bounce. So, you still need 500+ open pressure (with relatively mild lift) depending on application. Will the lifter be cool with that? (I'd assume, just asking) DOOP..just read the whole deal...run em.
    3) I bet you do not save money in the long run with these pieces. Add it up...you might.
    Buy them and give them a whirl.
    Good luck on the porject.
    Wags
    Those lifters alone will probably go for betwen $500-$600. Most of what is printed above is marketing. Just because Lunati says thay'll go over 7000 doesn't mean they will. There's too many other variables in the valve train, especially with hyd rollers. Wags is right...why use a hyd roller if you're going to run that rpm? Keeping that heavy-ass lifter following a 7000rpm roller profile is a tall order for the valve springs, and inducing that kind of load into the valve train is asking for destructive harmonics for what? So you don't have to adjust your valves a couple times a summer?
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    Gone in a Flash! Speed of Heat's Avatar
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    Something else to consider is oil aeration and foaming. I was considering going with a HYD roller for my 496" V drive River Cruiser, but upon a lot of research decided the solid is the only way to go. -Ya, I will have to check the valve lash once a year or so but its worth it. I found several posts on a couple of the off-shore sites where people had done research on this subject. Several experienced engine builders determined that with sustained running at rpm and the rocking and rolling that a boat experiences, oil is getting bounced around and thrown up into the crank even with a windage tray. One builder went to great lengths to run a motor wet on the dyno using full wet exhaust as just like the motor was set up in the hull. They had been losing power after 15-20 min. in the hull, but on the dyno made the full power and RPM. They fully instrumented the motor in the hull and found that aerated and foamed oil was the problem causing the lifters to collapse at higher RPM.
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    Senior Member motormonkey's Avatar
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    Sure you can get some to rev, but after a bit they will start to fail or bleed out. Solids for anything over 5500 steady running.

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    Senior Member The Violater's Avatar
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    Quote Originally Posted by motormonkey View Post
    Sure you can get some to rev, but after a bit they will start to fail or bleed out. Solids for anything over 5500 steady running.
    X 2, I go through mine once a month doesn't take very long and with stud girdles there are only 1 or 2 usually only a couple of thousands off. I like checking every thing for wear anyway. I also run lash caps, I have had roller rockers beat the tops off a brand new set of manley stainless valves in two seasons. At the end of the year I check all the caps and sometimes I find one that is starting to get scarred up. New cap back in business. I try to get at least 5 years on a motor and that is quite a few hours/miles.
    / The Few The Proud TheBlown

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    Senior Member stoker2001's Avatar
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    A custom ground tight lash solid roller is probably in order here
    with that being said it is possible to run hyd rollers to 8000+ in a drag race application (required in certain class pro drag cars)
    not cheap by any means tho
    requires ultralight components (titanium)valves$$$
    No SADI (ductile iron) cam cores=harmonics as low as 5500 rpm
    575lbs spring pressure is crazy for any juice lifter....
    i am happy with my Comp Cams linkbar hyd rollers with 460lbs at 7000rpm in car that could be everyday driver
    Whacker Smacker M/E #561 IHBA "first looser"champ 2006&2007&Sportsman Driver of the Year

  12. #10
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    Those Lunati's are Morels new super hyd roller that I posted about last year. They are designed for sustained high rpm. Good lifter. They run about $649 a set delivered.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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