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Thread: Finding an engines displacement

  1. #1

    Finding an engines displacement

    Is there a way to find out an engines displacement if you know nothing of the engine with out tearing it apart and physically measuring bore and stroke?? I swear I saw at the race track someone use a graduated tube that hooks up to the sparkplug hole and when the engine is cranked it measure the volume of air?? pumped??

  2. #2
    Senior Member MASTER BUILDER
    Join Date
    Dec 2005
    That is what you call "pumping your block".The only place i know of using that is truck pulling to keep the trucks within the rules.I am pretty sure you have to take the rocker arms off of the cylinder that you are checking and pull the plugs.So yes they do make a device to check cid and is supposed to be accurate within a certain percentage.

  3. #3
    Do you know what this device is called?

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    It's called P&Ging, almost all rounde round tracks have the tester, because of limited rules in each class on compitation. In thew old days at AHRA,NHRA,IHRA that's how they used to check after a win or if protested. I can't remember how many times i got P&G'ed when running a blown/b/gasser.
    Here's what the tester looks like, and if you know someone who is a tech at a sprint car track he may can test your engine for you. You have to disable the valves/remove puhrods on the cylinder being tested and remove all spark plugs. They normally roll the dice to see which cylinder will be tested, that being because a lot of the guys in the old days use to build an engine with one side bored bigger than the other.

    They are not cheap, but here's the website to when they sell them


  5. #5
    Senior Member RACING JUNKIE
    Join Date
    Jun 2003
    Hobbs, NM
    These are still used at alot of dirt tracks. You might call a local track operater and see if they will let you use their tester.

  6. #6
    They are pricey!! It's cheaper to take the heads off!!!LOL

    Thanks for your help.

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