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How To Make My B18a Rev To 7500

Discussion in 'Engine Building' started by Ractive78, Mar 17, 2003.

  1. Ractive78

    Ractive78 Senior Member

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    How I could I make my ls handle 7500 safetly, without changes pistons, and rods. I'm willin to sacrifice idle, and low end. And how much would it cost?





    Thanks
     
  2. chet

    chet Senior Member

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    its not realistic with a stock bottom end and stock head.

    mainly the stock head is what limits you...
     
  3. Ractive78

    Ractive78 Senior Member

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    I want to change the valve springs, cams, etc..
     
  4. Havok

    Havok Senior Member

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    You would need a new head, preferably one that says DOHC VTEC on the cover--then with skunk2 valves, valve springs, retainers--it's not hard, A Z6 can rev to 7200
     
  5. Ractive78

    Ractive78 Senior Member

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    Couldn't I keep the same head and just basically replace everything onit?
     
  6. BigJ

    BigJ I'm just about that action Boss. VIP

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    My z6 goes to 7500 stock, then rev limiter kicks in. I have bounced off it twice, and no damage that I know of. Well the 2 times were accidental. Hit brake and gas at same time :rolleyes:
     
  7. hcivic.com

    hcivic.com Senior Member

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    If you are going out and spend a lot of cash to buy new cams springs and retainers why not first buy a vtec head that is in need of a rebuild and start with the better platform
     
  8. Ractive78

    Ractive78 Senior Member

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    Because I just want higher rpm's to get more hp out of a turbo.
     
  9. Havok

    Havok Senior Member

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    well, the redline is 7200, it can always go over that by about 400-600, with the exception of a Pontiac :
    [​IMG]
     
  10. Ractive78

    Ractive78 Senior Member

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  11. Civic_88ls

    Civic_88ls Senior Member

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    yeah, ive hit mine so many times, its not funny in my ls. i want a vtec head then push it up to 8500 rpms with valves and springs etc.......build my bottom end to. :ph34r:
     
  12. geoff19crx

    geoff19crx Junior Member

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    the top end of the motor doesn't dictate how fast the engine can spin just how well it breathes. the bottom end controls that. the engine isn't able to spin high rpms due to bad r/s. if you want the engine to spin 9k rpm safely, fortify the bottom. the b18a were only meant to spin up about 7500 safely. the b18b is slightly more due to its forged internals, it goes to 8k safely. not to say you can't rev to more than those levels though. don't think for one minute that you strap a vtec head on and it can magically spin more rpm either because it can't and stay together. if you want more rpms change the rods, pistons, and get a cylinder brace. if you want wild get the thing resleeved with better ones because sideloading is a bitch.
     
  13. K2e2vin

    K2e2vin Senior Member

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    putting on a vtec head doesnt mean it would spin any faster. vtec just broadens its power band.
     
  14. Civic_88ls

    Civic_88ls Senior Member

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    Oh i planned on building my bottom end!!!!
     
  15. luVTEC

    luVTEC Senior Member

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    Add a B16A head and be done with it B)
     
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