im trying to do a compression test, but im not sure wat tester i need to in order to check my cylinder compression on my d16z6.
this one

http://www.harborfreight.com/cpi/cta...emnumber=39224

or this one

http://www.harborfreight.com/cpi/cta...emnumber=94190

 

those are two different gauges/testers. The first one is a compression tester (the one you want), the second is a leak down tester and its basically just another way to tell how good your rings are.

 

The first on is a compression tester used for testing your compression like what you wanna do. But the leak down tester is more accurate because it will tell you were the problem is. I'd buy the second one.

 

i jus wanna kno wat my compression is, because im starting to think my head gasket is blown. and i jus kinda wanna double check with the tester.
i already bought the head gasket.

 

For a straight compression test, the first is fine, the second leakdown tester is much better to diagnose problems but costs more and you need a good air line supply to run it.

If you have a good large air cyl. or a compressor, buy the leakdown tester, it is much better.

 

ok,so i bought a compression tester, im not sure if i did it right, i removed the spark plugs and placed them back as i went thru the cylinders. i cranked the car for 5 seconds. i checked the gauge and it read 120 precisely thru all cylinders. im pretty sure 120 is kinda low?i always thought 160-180 was normal. reason why i checked my compression is because since i sawpped in my z6 my temp gauge runs jus a lil bit hotter than normal. nothing really serious, i dun think, but i wanna catch anything before it turns to be a bigger issue. i have another head gasket ready jus incase, i have a new 170 t-stat, my rad is not clogged(checked), hoses are fine, no air bubbles in the system, fan is on a switch but even with the fan on it never drops past this level
C........m.l.l......H
i dunno wat im missing?

 

Did you hold the throttle open when you were doing the comp test. Do you have any water in you oil or vice versa. Is it skipping at all?

 

ok. so i jus redid my compression test after reading the correct way to do it. i came out with these results. first off, i unplugged the injector connectors, wedged the tb wide open, and removed all spark plugs.
cyl. 1 185
cyl. 2 195
cyl. 3 190
cyl. 4 190
i cranked the car about 4-6 times each
and on all cyl. from the initial crank to the final crank it went up about 30-20 psi.
is this normal?

 

anyone?

 

is wat skipping at all? and about the water in the oil? i dun think so. even tho a couple of weeks ago after recently swapping in the new z6 i wud pull up the dipstick and it looked like condensed water on the upper part of the dipstick(above the ful mark). i dun think i ever payed it much attention. but i check it now, and nothing. wud this cause my temp gauge to sit up at that level>?

 

The compression looks fine its all within 10%. As for it overheating, what mixture of coolant are you using?

 

str8 water right now.