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High compression?

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    #1

    High compression?

    I just did a compression test on my '93 LX 5speed w/ 285k miles. The car seems to run just fine, never giving me any issue to speak of; I ran the test out of curiosity.

    Results are as follows:
    195 - 190 - 190 - 190 -

    This is surprising, as I would have expected much lower results for a car that has such high mileage (relatively speaking!). I've heard that carbon buildup can cause this.
    Do I need to be concerned about this? Chances are, the car has been like this for a while. I just drove 700 miles a few days ago and performance was fine. I'm looking for this car to last me through almost through grad school, so another 4 years or so. If the high compression is indicative of some failure, I'd like to know about it. Thanks
    Tags: None
    #2
    those are good numbers. drive that thing man!

    now with the mileage, do you know when a water pump & timing belt were installed last?
    Officially "hilarious mad sarcastic"! Thanks CB74christ for the recognition of my work.

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      #3
      Originally posted by lost_accord View Post
      those are good numbers. drive that thing man!

      now with the mileage, do you know when a water pump & timing belt were installed last?
      I thought the service limit was 175PSI, hence my concern. Timing belt, water pump, and all accessory belts were changed about 15,000 miles ago. This car has been really well maintained by it's previous owners, both mechanical engineers who did all their own work.

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        #4
        carbon build up can cause higher compression.
        I <3 G60.

        0.5mm Oversized Stainless valves and bronze guides available. Pm me please.

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          #5
          ok I looked and that is a little high. I don't think it's anything to be concerned about. Also if the test was done while the engine was cold and not at operating temp then the numbers will be a little higher than actual.

          Factory compression - Standard 178psi and Minimum 135psi
          Officially "hilarious mad sarcastic"! Thanks CB74christ for the recognition of my work.

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            #6
            but the numbers are consistent which is what you are looking for. each tester is different.
            I <3 G60.

            0.5mm Oversized Stainless valves and bronze guides available. Pm me please.

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              #7
              Originally posted by wed3k View Post
              but the numbers are consistent which is what you are looking for. each tester is different.
              Yep. Consistency is what you're looking for. Personally, I aim for less than 5% difference between any cylinder.

              ANd yes, different testers will test differently.

              CrzyTuning now offering port services

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                #8
                The service limit being rated @ 175psi is probably for regular gas.
                Compression is good. You just have to have the appropriate gas to handle it. Use premium gas if you're paranoid. But the extra compression is just free HP. lol.

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