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How High Can You Go

Discussion in 'Integra' started by TAGURIT, Sep 28, 2006.

  1. TAGURIT

    TAGURIT New Member

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    how high can you rev an ls motor w/ stock rods, stock pistons, w/ dual valve springs at a compression of 11:1:1 with arp rod bolts and arp head studs?
     
  2. 97hatch

    97hatch ?

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    how do you get 11:1 and use stock pistons :eek: me must know (just pore in a botle of compression boost or what )
     
  3. MikeBergy

    MikeBergy Blah blah blah....

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    lol, yeah, you haven't seen that compression boost additive at kragen? :ph34r:
     
  4. TAGURIT

    TAGURIT New Member

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    radius the head.....
     
  5. 97hatch

    97hatch ?

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    if you take material out of the head it would lower compresion :footinmouth: :doh:
     
  6. TAGURIT

    TAGURIT New Member

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    trust me, my compression is 11:1:1 with stock rods and pistons.....
     
  7. reikoshea

    reikoshea HS Troll...And Mod Moderator VIP

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    milling to .06 would do it, but valve tap might become a problem. id definitely clay the motor before hand (like you should do anyway).

    i dont know the answer to this question, but i will say you want to use a type r oil pump if you plan on going over the stock red line.
     
  8. TAGURIT

    TAGURIT New Member

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    actually all the work is done and only used to rev to 7200 before valve float with stock rod bolts and head bolts. i have since then upgraded with arp rod bolts and head studs and added dual valve springs. so i was just curious how high could i go (safely) with the upgrades.
     
  9. tartymctang2357

    tartymctang2357 Grand High Wizard

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    changing the head doesn't change your redline, the thing that determins your redline is the rod stroke ratio of the block, a stock ls block (b18a/b) has a r/s of 1.54 a GOOD r/s ratio is typically 1.66-1.78, so unless you change the stroke of the crank or the length of the rod you should only rev it as high as the redline on a stock ls block which is 6500 any more and you risk damaging the bottom end, and if you don't take my advice at least change the rod bolts to arp that'll help with higher then stock redlining
     
  10. lsvtec

    lsvtec GNU/Linux Evangelist

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    This is not true. Actually, with good rods you can rev the LS bottom end much higher. I had mine at 8200 reliably. R/S ratio determines side load and after you work out the amout of side load placed by a GSR bottom end, the increase to the LS is insignificant (IIRC it was less that 1% different). Before you quote answers like this make sure that they are correct.
     
  11. tartymctang2357

    tartymctang2357 Grand High Wizard

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    right and the side loading creats vibrations in the cylinders, thats why a gsr has a block girdle to help with those vibrations, a stock ls block doesn't have one
     
  12. lsvtec

    lsvtec GNU/Linux Evangelist

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    I understand, but are you trying to tell me that a difference on less than 1% is going to tear an engine up?
     
  13. reikoshea

    reikoshea HS Troll...And Mod Moderator VIP

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    its not....the big reasons you cant overrev the ls:

    oiling.

    people try and use the standard ls oil pump, instead of the itr. the ls doesnt have oil squirters so the friction is increased...hence the melted piston problems

    Its a piece of engine building fact that the longer the stroke. Thats kind of a cop out of a reason, but it works

    even though lsvtec can be made reliable, you have to realize that you are using parts that were never meant to be together and shit does happen. timing belts might skip teeth, cam lift maybe too high....you never really know.

    you are right to a point tarty, rs has something to do with it, but there are plenty of other factors involved.
     
  14. lsvtec

    lsvtec GNU/Linux Evangelist

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    There is the key, proper lubrication. The LS oil pump is woefully undersized for high RPM. I didn't want the oil squirters becase I ran forged internals and didn't need the heat dissapation that they provide (they don't provide much more lubrication than you get without them).
     
  15. MikeBergy

    MikeBergy Blah blah blah....

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    Not to threadjack, but what about the pr3 b16a oil pump? I am using one on my b18a, and haven't had any issues after almost 30k on the build, and I rev to around 7500 (where my redline is set).
     
  16. TAGURIT

    TAGURIT New Member

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    ok, so if we go back to the top, my post.....how high would i be able to rev with the new hardware??
     
  17. lsvtec

    lsvtec GNU/Linux Evangelist

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    Without the cams to breathe any higher there is no point. I have seen LS rods go to 8000 with ARP bolts. I haven't personally seen any higher.
     
  18. HatchSpeeD

    HatchSpeeD ...Hi...

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    For future reference, I believe the GSR & R have the same part number for oil pump. No difference. Thats only been maybe the last few years acura made that move.
     
  19. reikoshea

    reikoshea HS Troll...And Mod Moderator VIP

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    yup, youre right, they are. good info.
     
  20. LateApex31

    LateApex31 New Member

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    It should rev past 8k no problem. However, you should put it on a dyno to see where/if it makes any power.
     
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