Yeah. Well spoke to a real good mechanic local to me who's given me a load of info. He said he is worried about cyl 3 and 4, cyl 3 for the difference and cyl 4 because the wet test didn't increase the pressure, but I'm pretty sure I did read 190 briefly so that's a 5 psi increase, just like cyl 1.
This website quotes
Four readings, all within 10 pounds square / inch of each other (1.38 Kg sq/m) -- a sound engine.
Some people say that if all four cylinders are within 20 pounds of each other, all is well. I work to within 10 pounds. A fault shows up quite dramatically on the compression tester.
Having got your set of readings, you now need to do further tests to determine if you have worn or broken piston rings OR leaking valves.
Add a pipette of oil to the low cylinder. (If you do not have a pipette, use a piece of plastic tube with about two inches of engine oil in it). This oil will seal broken rings temporarily.
Repeat the test. If the pressure rises by say 20 pounds square inch, then you have broken or badly worn piston rings. If the pressure does NOT rise, then you have leaking valves. A faulty inlet valve often gives itself away by spitting back through the carburettor when running.
The mechanic said there is a product from a company called Lucas, but no the Lucas we know here...It's an American company, and this oil addictive is used in drag racing over the pond. He said they used to sell it here but he now can't find anywhere that does it. He said that it was used in an old pick up that drank oil like nothing and after the treatment it didn't completely cure the problem, but it helped massively. I've got no oil being burnt so it should almost cure the problem.
I think this is the product
