Compression test weiscos | Ford Escort Owners Association (FEOA)
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Compression test weiscos

Discussion in 'Forced Induction & Nitrous' started by uglyducklingescort, Nov 26, 2008.

  1. uglyducklingescort

    uglyducklingescort New Member

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    Assuming the different material and having the rings filed to weisco's specs on rebuild will my compression numbers be lower when the engine is dead cold? If so how much lower than it might possibly be when warmed up due to therman expansion, 8.5-9.1 to 1 compression. BP05 Head. I never did a compression test after the rebuild and the number looked low around the 120's with the engine turning 5 or so rotations. Is cold out and I only did one piston #1.

    -Steve
  2. vtec-this

    vtec-this FEOA Member

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    stock head gasket and combustion chambers?
  3. LilBigMec

    LilBigMec New Member

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    While it's always best to do a compression test on a warmed up engine, you probably won't see much more compression out of it when warmed up. How many miles do you have on the engine since the build? Did you do the test just for sh!ts and giggles or do you think there is something wrong with it?
  4. uglyducklingescort

    uglyducklingescort New Member

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    gits and shiggles..... I have no problems with it. As for it warming up why would there be little or no difference? They are aluminum. As for head gaskets and head yes they are all stock.

    -Steve
  5. therieldeal

    therieldeal FEOA Member

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    steve that sounds a little low

    you did have the throttle wide open when you did the test, right?
  6. uglyducklingescort

    uglyducklingescort New Member

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    LOL no......


    :beer:
  7. therieldeal

    therieldeal FEOA Member

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    haha well give that a shot..

    also, forged pistons tend to expand more with heat than cast pistons. thats one of the reasons they arent generally used in factory applications... the additional clearance needed results in more piston slap noise when the engine is cold.

    i say warm it up first in order to get an accurate comp test.
  8. uglyducklingescort

    uglyducklingescort New Member

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    Yeah I figured it was just a question. It runs fine otherwise.

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