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Who loans a compression tester gauge2/12/2024 Or I can just use Autozone loan-a-tool and test it again. I can factor in the extra cc's, calculate the effective compression ratio, and estimate the actual cranking pressure. The much larger MG combustion chamber is less effected by the extra 29cc but the test numbers will still be low.Ĭan anyone tell me the volume of a stock low compression MG head. This effectively lowers the compression ratio (10.5 stock) and is the cause of the way-too-low to run test numbers. I don't know the head volume on the GPz but 29cc is just over 20% of the (138cc) swept volume. The total length of the hose (adapter to gauge) is just over 36" and adds 29cc to the head volume. The adapters in this kit do NOT have check valves. In fact I don't think it would ever start with pressure that low. The bike starts easily, runs very strong, and although I know retarding the Intake cam (delaying the Intake valve closing event) has a negatively effect on cranking pressure, it would not lower it to 70. I ran a test on the (antique)'84 Kawasaki GPz and found even 70 psi readings on all 4 cylinders. I was using a brand new kit, Harbor Freight model 95187, which has the 3 adapters I need to test the MG and my 2 sport bikes. I have found the cause of the somewhat low test results. Waiting until something breaks can be expensive. And clean and re-lap your valves (forty cents worth of lapping paste), and you'll have bought your engine tens of thousands of miles. ![]() Replace the rod bearings (about $43 for the tri-metal - don't buy the cheapie aluminum ones). Do a head gasket (a Payen gasket is $24). Finance is a big question mark for everyone nowadays but winter in NH isn't MG weather and if you have the space and the finances, I'd consider taking an engine with 110psi compression apart while in the car to do some preventive work. All you know is that they aren't getting crudded up. The color of a spark plug says nothing unless you start with new plugs and shut the engine down while at 3000+rpms. Apr 06 FLCentral Florida All British C.Ī wet test might give improved results but.
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