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HP & Comp Ratio

Discussion in 'Technical Q&A' started by gonzo350, Dec 27, 2004.

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  1. gonzo350

    gonzo350 Karting

    Apr 3, 2004
    207
    Lafayette Indiana
    Full Name:
    Myles
    #1 gonzo350, Dec 27, 2004
    Just ordered a set of pistons from Wiseco (spoke with Brian....great guy, very helpfull and knowledgable.) for my '84 308QV. Decided on 10.5 to one to bump the power up a tad but still remain streetable. Also had my exhaust ceramacoated by airborn coatings. With everything else being stock on a freshly rebuilt motor.....where do you think I'll land HP wise? 250, 255? Just curious to see what you guys think. I'll post pics as this block up rebuild goes on!


    Thanks!


    Myles
     
  2. fedev

    fedev Rookie

    Nov 10, 2003
    23
    #2 fedev, Dec 28, 2004

    I would at least retard the intake cams to get a little more top end (better filling) and reduce static compression (= risk of detonation)..
    Longer duration cams would be better nevetrtheless
     
  3. gonzo350

    gonzo350 Karting

    Apr 3, 2004
    207
    Lafayette Indiana
    Full Name:
    Myles
    #3 gonzo350, Dec 28, 2004
    Anyone have any ideas on what it might come out to?
     
  4. Michael B

    Michael B F1 Rookie
    Owner

    Apr 28, 2004
    3,764
    US of A
    Full Name:
    Michael
    #4 Michael B, Dec 28, 2004
    I bummped a 3.0 liter to 9.8:1 from 9.3:1 and honed out the intake & exhaust path some years ago. Dynoed it before & after. The gains were marginal, but they were throughout the rev range. It made the engine more driveable, and more enjoyable for me.

    To the wheels gain was 7-8 HP peak.
     

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