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Thread: 1983 Honda 200E Needs More Power.

  1. #16
    Join Date
    Apr 2014
    Location
    Edmond, KS
    --
    1,883
    That's would be a close call. Others would be more experienced with this than I am, but I'm not sure if pump gas would be enough for 11:1.

  2. #17
    Join Date
    Apr 2012
    Location
    MI, USA
    --
    3,892
    I don't know compression ratio vs octane requirements that well, but my Lexus is 10:1 and calls for 90+ octane, a ton of 9:1 engines run on 87 fine (maybe all?). I suspect around 11:1 would be around 93 octane. Doesn't hurt to go a little higher than needed, but being too low is bad.

    I'm sure there's someone with a lot more experience than me that would have a better answer.

    FYI, I can run my Lexus on 87 octane pump gas, but the ignition timing is pulled. I can feel the response isn't quite as crisp and fast. I get a lot better MPG with 90+ octane, but economics $$$ per mile, the 87 is the best value in my case. It's a v8 rwd big heavy car... yes Japanese car with a Japanese V8 that's designed for Americans with the traditional 90 degree V8 layout but DOHC + high compression + ultra smooth balancing. The ignition system legit is 2x 4cyl igniters (modules), two distributors (one on each cam), two coils. You can get an ignition problem and still drive home on the 4 cyls that still run.

  3. #18
    Join Date
    Nov 2019
    Location
    ontario
    --
    8
    thnks for the imput!

  4. #19
    Join Date
    Nov 2019
    Location
    ontario
    --
    8
    would a domed 10.25 piston provide more low end torque?

  5. #20
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,198
    Short answer is yes you will feel more power/ torque from going from a stock compression piston to a 10.25 compression piston . Itís not huge but noticeable .



    Quote Originally Posted by zachpen View Post
    would a domed 10.25 piston provide more low end torque?
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