Compression Test

[OliverB]

Hi guys,

 

So, following some good advice from Adrian at Torqen (among others), it is time to do a compression test. The aim is to figure out where all my oil is going. This can be done with standard tools that I own, however I don't have a compression gauge yet.

 

I have almost zero experience in terms of vehicle mechanics, something I'm hoping to change. For now though, would anyone be kind enough to help me out?

 

I'm based in Milton Keynes.

 

If I can get my oil issue sorted and get that warm fuzzy feeling, I'll hang on to the car, maybe build the engine and make a proper project of it, learn the craft as I go. That's the dream anyway

 

Link to a compression test walk-through: https://www.youtube.com/watch?feature=player_embedded&v=6QShFmsEdn4

[SUPRAWOOKIE]

You coming to the meet at the stadium tonight buddy? I'm sure Ed, Mark and myself will be able to sort you out.

 

We're all there tonight so pop down if you can.

[ZMANALEX]

A dry compression test as per the video will not provide the information that you require to establish if the piston oil rings are worn or broken.

 

The compression test will only provide the condition of the compression rings or valves which have absolutely nothing to do with oil consumption.

[OliverB]

Supra, I'll try and make it down, although I've got a work event this evening that supposedly ends at 9 (in Luton). I'll try and get out early and give you a call.

 

My concern for doing it tonight is A) I don't have the compression gauge yet, the lighting at the stadium isn't great!

 

ZMANALEX, what would you suggest?

[ZMANALEX]

A leak down test is an option that some use, however it is quite time consuming. (Plenty vids on You Tube)

 

I prefer just to carry out a normal compression test followed by a controlled wet compression test as it is quick, accurate and efficient.

[Adrian@TORQEN]

 

 

More in the manual here:

http://www.nicoclub.com/manuals/350Z/coupe/2005/em.pdf

[SUPRAWOOKIE]

Oliver, not going to be able to test tonight anyway but if you can make it down i'm sure we can help arrange something with you.

 

Not having much luck at the moment buddy, hope things get better for you soon!

[OliverB]

Cheers guys. I wouldn't be able to buy a compression gauge before I meet you anyway. Yeah kinda down on luck lately but things will turn around eventually.

[Adrian@TORQEN]

Oli, can you come down to Watford to pick up the gauge? I have a brand new one in the garage, somewhere, if it helps. I'll go and look for it now, make sure it's what you need.

 

 

[OliverB]

Sure, that's 30 mins away. Wouldn't be able to today, trying to make the meet in MK after work. Might be able to do it on the weekend or next week?

 

Thanks

[Adrian@TORQEN]

Found it!

 

 

 

 

Weekend is fine, PM so we can arrange.

[Mark@Abbey m/s]

Compression check will not show up the oil control rings failing. The top 2 compression rings will be sealing fine. Cylinder leakage test will again not show up oil usage due to oil usage.

 

The oil control rings lose there tension so are unable to scrap the oil from the bores. Common problem on our V6's the Rev up is the worse culprit.

 

 

[OliverB]

Mark, I'm going to give the compression test a go, at the very least I will get a better picture than I have now. What test would you recommend for the oil control rings?