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bryan m
Lv 4
bryan m asked in Cars & TransportationBoats & Boating · 1 decade ago

What would be a good compression reading on a 1988 Mercury 135 HP?

Also what percentage difference in individual cylinder compression would be allowable, thanks

2 Answers

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  • Harry Buttcrack
    Lv 7
    1 decade ago
    Favorite Answer

    New specs for that V6 where 135-155 psi, anything below 120 psi have a noticable power loss. All cylinders should be within 10%.

  • olivercheetham
    1 decade ago

    All should be above 110, higher, like 130 is good, the motor will run on 70-80 but hard to start and tired

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