Hey guys, can someone pleeeease tell me how to run a compression test on my mini step by step? I need to run this test on my engine asap! thanks

 

It does require some tools......an air compressor, an adapter for the air compressor that screws into the spark-plugs, and a gauge, a good ear, and some understanding of engine timing.
Since it is a test that is highly skill dependent (interpreting when the valves are fulled closed, as opposed to valve/ring leakage, etc,) since you are rotating the motor listing for air through the valves, I would recommend that if you need one done, you should pay someone to do it. IMO it is simply not something an average home DIY could do with any type of reproducibility!
That is just me.....

 

Back in the day, we used to just disable fuel supply and remove the coil wire. Then remove one spark plug and thread a compression guage into the plug opening while somone sat in the car and cranked the engine with ignition key....repeat process for each cylinder while checking readings of the guage.

Does this not work anymore or is it not result specific for these engines ?

 

Good thought!! I was just going back to the way compression tests are done on piston aviation engines...if that way works...would be pretty simple to watch the gauge for its peak!
Doing it with the air compressor does give the advantage of you can tell where the leak down is occurring....vales, rings, etc....but for just basic numbers to see if everything is ok...I think it is a good solution to see if you must dig deeper!

 

They still make em'

http://www.tooltopia.com/star-tu3p.a...aign=nextag_r1

 

place car on a very steep hill and put in first gear . shut engine off and do not set e-brake . go get a cup and do some window shopping etc. . if car hasnt rolled away by the time you return then you prolly got good compression

 

 

And a good clutch!!