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Tmoose - yes, the 245 jump only occurs during the wet test.

Tmoose - before doing the test I've disabled the ignition coils, fuel pump, and fuel injectors. However, after you've mentioned, I remembered I forgot to tell by brother to keep the accelerator slammed to the floor when turning the starter motor.. So I know realize my readings are with closed...

Hi Tmoose, It takes the same time/revolutions to reach 170psi on all cylinders. On cylinder 3, once 170psi is reached, it stays there for 2-3 revolutions and then jumps to 245.

Guys, I agree with all of you. Why can't you understand that this is just an experiment... It might be placebo if I can barely tell any difference in engine performance - this is why I've took baseline compression readings - if it will raise the compression by 15-30psi, make my engine...

Call me whatever you like... I don't feel bilked as $70 is engine oil with stage-1 revitalizant (I needed an oil change anyway), remaining $30 is two tubes of revitalizant for stage-2 and stage-3. I will know if I have been bilked after the full 3-stage treatment and compression test. As I've...

Well, I already did the test twice (same results), but I guess it won't take long to do it one more time just before the first stage of revitalizant treatment.

"No additive can put metal back into the bores or rings. <...>" I myself am on your side too, however believe it or not the "revitalizant" claims contrarily - it says it adds ceramic-metal (not metal) and rebuilds worn areas at atomic level using nano-technology. I know, it sounds too good to be...

noooope, mechanic in a TUBE... :) I'm trying this because a friend of mine with exact same engine witnessed reduced engine noise/vibration and increased performance/dynamics. I am myself am a big sceptic regarding these products, but my engine is old/high-mileage, so I thought what the hell...

I've must've added too much oil then.. However I still don't think it would have caused 30% higher reading... I'm planning to use engine "revitalizant" claiming to improve compression in cylinders, and after couple thousand miles I'll repeat the test using teaspoon of oil this time, I'll see if...

Could be.. But wouldn't it cause higher pressure on dry test too?

245 also seems unreal to me... The gauge is new, I don't think it's faulty, at least not that inaccurate to show a 30% bigger value, plus I did repeated tests, and this is only happening on cylinder-3... Maybe it's carbon build-up in cylinder-3 reducing the cylinder volume, hence the bigger...

One more thing - when testing cylinder-3, the compression seems to be the same (170) for a while, but after a few additional turns it jumps to 245.

Hi, Sorry if this is an easy question, but I'm not really a good mechanic, so I thought some smart guys here could help me :) I did a compression test on old Volvo (1998, 2.0, petrol, non-turbo). I did both "Dry" and "Wet" tests (by "Wet" I mean adding a spoonful of oil into the cylinder...