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That looks good CR I think you should be looking for circa 150psi in each cylinder . Very straightforward test to do. Tank off-plug out- screw in adaptor-throttle wide open -spin engine over for 5-10 seconds -read results on gauge. Repeat for H cylinder Money well spent mate.
I bought that Sealey compression testing kit a few weeks back. Works fine on 4valve engines, and a nice bit of kit. Did wonder if the gauge was reading low, so i checked it against airline at work mine is pretty accurate (within 5%). (Unfortunately this means both my cylinders are lower compression than they should be.) Great value at £25
Just make sure that if the compression tester needs an adaptor to fit the sparkplug hole that it is nice and tight on the tester as you don't want it staying in the plug'ole when you unscrew it afterwards.
That had crossed my mind, that's why i've ordered ones with a hex end so if it does I have a fighting chance of getting a socket down.
FWIW in all seriousness I don't think a compression test is necessarily your best course of action Creamy, my bet is you'll find the results a bit confusing and there's definitely a chance of getting things stuck in a place that's bloody difficult to extract :Wideyed: I'd want to know whats going on with those "new" belts, what was wrong with the ones that were fitted only 800 miles ago and check the valve clearances, what's the mileage 8K ish I'd be surprised if they weren't all in spec unless it's been absolutely hammered and it doesn't look like it has
At the risk of teaching granny to suck eggs do a wet test. Drop oil down the bores and do the test again. If the pressures increase substantially then it's your valves if they don't then it's the rings/bores or them and the valves
I got it wrong anyway If the pressure increases substantially then you have worn rings. The oil will make a better seal. If the oil makes little difference then it's likely to be your valves leaking
I think if you do a compression test on a cold engine the figure is a fair bit lower than on a hot engine?
Iirc the compression ratio of my 749 was about 10:1, so I was expecting to see about 10 x 14.7 psi reading on the gauge ( atmospheric pressure being about 14.7psi@ sea level ) What I actually saw when I performed this test was about 150psi on the horizontal cylinder and 120psi on the vertical Thereby revealing problems with the V cylinder pressure which turned out to be valve clearances out of spec' Once rectified, both cylinders now equal @ 150psi. IMO this is a valuable test to do on any engine, especially as it's quick and simple, and can reveal any discrepancies without resorting to having to strip the engine down to investigate.
