What exactly is this test. Why would compression ever change from the stock compression... also is this expensive to get tested.... where would you do this... what are good number and bad so for.....
Compression Test
- Thread starter edhgreatone
- Start date
U lower the compression ratios ussualy when u turbo a civic engine such as a b16 or b18 U do this because on a honda the compression ratios are so high and the time that it takes for the pistons to move up and down needs to be lowerd when u are running boost many peps never do it and they f**k up their engines cause to much boost makes it a lot harder for the pistons to work properly. U can lower it ur self but it requires a lot of tuner equipment. I would take it to a tuner shop if i were u or learn more about it and do it urself.
um i dont think he is talking about that.....at all. i know ther is a diy way to do it, but i forgot where that went. id just bring it to a shop to find out. it doesnt measure the compression of your pistons (so to say). i forget what it measures, but you want allto be even and within certain numbers....
different type of compression, a compression test measures how well the engines vital parts are sealed. you need a compression tester, goes for about 30-40 bucks, its basically a pressure gauge that screws into your spark plug hole. you pull the fuse for the fuel pump, and hook up the compression tester, and turn the engine over until the pressure gauge stabilizes. repeat for all cylinders. readings should be within 10-20 psi of each other, if say you get a reading of 200-200-205-110 you know cylinder 4 has a leak. a blowby test is similar, but a compressed air hose is attached to the spark plug hole while the cylinder is at bdc with all valves closed. you then listen to see where, if any, air is leaking out. this can locate a bad head gasket, valve seals, rings, etc by finding out where the air is leaking from.
i see...... thats very helpful handle..... say you have a problem with one of the cylinders.... what would do then is this expensive to fix?
yes it is. reparing piston ring failure or bad valve seals is pretty complicated, and unless its a motor worth a lot of money, its probably not worth it, especially if its the rings. valve seals might not be too bad to repair.
And you don't want the number to be too high either... because that my friend, means CARBON!