1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

8500 RPM on LS Bottom

Discussion in 'Engine Building' started by JDMH22Integra, Sep 1, 2004.

  1. JDMH22Integra

    JDMH22Integra Senior Member

    Messages:
    140
    Likes Received:
    0
    Joined:
    Jun 9, 2003
    Can a stock LS bottom end get itself up to 8500 RPMS, and if not, what would be the most reliable (dont read cheapest) way to have an 8500 RPM LS bottom (have the head covered)
     
  2. integraslut78

    integraslut78 Stylus DJ Extraordinaire

    Messages:
    2,582
    Likes Received:
    2
    Joined:
    Jul 27, 2003
    Location:
    KiLLa kALi
    You will want to sleeve, higher compresson pistons and rods, cams, and valve springs and retainers and it should hold up to 8500 but not much more.
     
  3. StyleTEG

    StyleTEG Senior Member

    Messages:
    217
    Likes Received:
    0
    Joined:
    Oct 22, 2003


    why not much more?
     
  4. exospeed*com

    exospeed*com Member

    Messages:
    62
    Likes Received:
    0
    Joined:
    Jul 30, 2003
    first of all. LS blocks can REV up in the 9000 RPM range ONLY if they are built and prepped for that kind of stress.

    Stock LS bottom ends can handle 8000K and 8500 is pushing it. Mainly because most of the LS bottom ends out there have plenty of miles and arent up to that type of stress. bearings are wearing out, oil pump may not be able to handle it as well.

    I wouldnt suggest taking it up past 8000rpm in stock form.
     
  5. ilikepie

    ilikepie Senior Member

    Messages:
    416
    Likes Received:
    0
    Joined:
    Nov 21, 2002
    I think the block would hold up just fine.. you just have to have a good valve train: cams, valve/retainers. Thats all you should really need to worry about. Just my .02
     
  6. K2e2vin

    K2e2vin Senior Member

    Messages:
    8,446
    Likes Received:
    92
    Joined:
    Jan 2, 2003
    Location:
    Raleigh, NC
    i would suggest sleeves and rods, and as exospeed suggested, oil pump.
     
  7. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    53
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home
    there is absolutely NO point in sleeving a motor to gain 800 rpms. Talk about a waste of 1k.

    If you want the bottom end to spin to 8k, the oil things i'd replace are the rods and oil pump.
     
  8. 97CTR

    97CTR Senior Member

    Messages:
    745
    Likes Received:
    0
    Joined:
    Jul 10, 2003
    yeah the block is fine for those rpms. New bearings, rod bolts, rods, oil pump.
     
  9. allbottledup

    allbottledup Senior Member

    Messages:
    1,548
    Likes Received:
    1
    Joined:
    May 31, 2004
    Location:
    Galloway, NJ
    the reason the gsr can rev so high is because of the oil squiters it has. THe ls doesnt have them to keep things extra cool and lubricated.
     
  10. Crix

    Crix Senior Member

    Messages:
    193
    Likes Received:
    0
    Joined:
    Jul 23, 2004
    You do NOT! need to reslevve the block. Stock ls slevves have worked fine for me. Iam up to 9500rpms using a ferra valvetrain, itr cams, .25over pr3 pistons, stock ls rods and crank. No problems at all. The rotating assembly has been balanced and new itr oil pump. Ive driven on this car for around 15K miles now with not one problem. My suggestion is to go with your bottom end use arp rod bolts, and upgrade the vavletrain and cams.
     
  11. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

    Messages:
    28,465
    Likes Received:
    228
    Joined:
    Sep 30, 2002
    Location:
    Dallas / Fort Worth, TX


    If you run with forged or coated pistons, you don't need the oil squirters. Quite a few modded engines actually run without the oil squirters to reduce windage losses or because they just won't fit.
     
  12. MikeBergy

    MikeBergy Blah blah blah....

    Messages:
    3,646
    Likes Received:
    1
    Joined:
    Oct 9, 2003
    Location:
    Central Coast, CALI
    I'll throw in my .02

    If you want to run at above 8500, I am assuming you will already have the engine built to actually make power up there, right? High compression pistons, higher lift/duration camshafts are both going to be necessary. To keep the bottom end from spinning bearings, which is usually what happens when you spin a ls bottom end that fast (known by personal experience), you will need to update the oiling system. This means a b16/gsr/itr oil pump, because the ls one is garbage. The ls pump does not put out a high enough oil pressure to maintain a good film of oil on the bearings at high rpm, so you end up rubbing the bearing material down to nothing, and then the klunking starts. A b16/itr oil cooler is also a good uprade, but any oil cooler will work. You can also shotpeen the stock ls rods for a little cheap insurance if you don't want to fork over the cash for some forged ones. Get the bottom end balanced, no questions asked.

    For the top end, definitely get a valve train to keep up with the new camshafts you are getting, and you should be fine up top.
     
  13. MikeBergy

    MikeBergy Blah blah blah....

    Messages:
    3,646
    Likes Received:
    1
    Joined:
    Oct 9, 2003
    Location:
    Central Coast, CALI


    The gsr can rev higher safely because it has a shorter stroke than the LS, and the better r/s ratio means less sideloading on the cylinder walls. As well as all the lubrication issues already addressed.
     
Verification:
Draft saved Draft deleted

Share This Page