high compression

Discussion in 'Engine, Fuel and Exhaust' started by astrorock, Mar 27, 2010.

  1. astrorock

    astrorock Member

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    Hello all, i have an evolution with an ev27, intake, re-jett, python exhaust.. it runs really good.. i was wondering, if i took out the factory 8.5:1 pistons for 10:1 and got the heads worked will there be enough power gain to justify the cost??
     
  2. BUBBIE

    BUBBIE Well-Known Member

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    YOU WOULD NOTICE A BIG DIFFERENCE........ 10/1 COMPRESSION IS WHAT THE EVV 27 CAN USE...
    I had the similar set-up on my 97 fxds..... I used wiesco 10.5/1 but found that to be TOO MUCH so i went to 10.1/1 and it was NICE...
    seems I used a module ? crain? with 3 different curves and that helped on the timing...

    BUT why not go bigger on the bore at the same time???
    ROOOOOOMMMMMMMPhhhhhh

    signed....BUBBIE
     
  3. shovelrider

    shovelrider Member

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    Make sure you get the headwork done by someone that is reputable.You should notice a huge difference.:D
     
  4. jim1102

    jim1102 Member

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    I had this same thing done on a1996 dresser, it made a big difference in the seat of the pants dyno.The RPMS will come up alot faster.Iwould definetly recomend it.