Mickly Posted June 18, 2022 Share Posted June 18, 2022 I’m in the midst of sorting out my Trophy engine issues & have got to the point of measuring compression. I have a question about this process - I have a compression tester & on the 1st cylinder when it first cranks for a few revs the gauge shows 125psi but when immediately cranked again it goes up to 150psi, after that it won’t go any higher, which reading should I be using? Quote Link to comment Share on other sites More sharing options...
Bender Posted June 18, 2022 Share Posted June 18, 2022 Usually use highest reading but compare with other cylinders. 1 Quote Link to comment Share on other sites More sharing options...
V650 Posted June 18, 2022 Share Posted June 18, 2022 If the compression tester has a rubber hose connecting it to the sparkplug hole maybe it takes a few seconds pressurise that hose & following tests the hose is already pressurised Any time I have done a compression test on the car it was crank it while cold with the throttle open until the pressure stops increasing 1 Quote Link to comment Share on other sites More sharing options...
Mickly Posted June 18, 2022 Author Share Posted June 18, 2022 1 minute ago, V650 said: If the compression tester has a rubber hose connecting it to the sparkplug hole maybe it takes a few seconds pressurise that hose & following tests the hose is already pressurised Any time I have done a compression test on the car it was crank it while cold with the throttle open until the pressure stops increasing That’s what I’ve been doing and have got 150 psi on all cylinders so happy days. 2 Quote Link to comment Share on other sites More sharing options...
V650 Posted June 18, 2022 Share Posted June 18, 2022 (edited) I would say if you are getting 150 ( 10 bar ) on all 3 your grand Edited June 18, 2022 by V650 Quote Link to comment Share on other sites More sharing options...
Mickly Posted June 18, 2022 Author Share Posted June 18, 2022 1 minute ago, V650 said: I would say if you are getting 150 ( 10 bar ) on all 3 i'd say your grand All 4 … it’s a 1200 Triumph Trophy, I’m really chuffed. 4 Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted June 18, 2022 Share Posted June 18, 2022 Well done that man. 1 Quote Link to comment Share on other sites More sharing options...
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