well jsut did my compression test on my b18c1 in my EG hatch, the numbers were
#1 160
#2 160
#3 160
#4 160

its a bone stock GSR when i searched in the archive content i seen guys tests up to 200? what gives? is this normal?

 

You can try the test again after putting a drop of oil into each cylinder, but I think 160 across the board is nothing to complain about. Worry more about consistency than numerical values. However, since the b18c1 has a relatively high compression ratio, I'd expect a higher number.

Also, I assume it was performed at WOT and on a warm engine...? Those two factors make a difference.

 

You need to put a teaspoon of oil in each cylinder, then crank over the engine for several second with the plugs out to blow out some oil through the plug holes, you can lay a towel across the holes if you wish.

Watch the very first needle movement of the guage, this is ring sealing, it probably should be above 50, only crank a certain number of cranks, all the same, maybe 5 to 7 cranks, you will notice each compression stroke and needle movement, if you just keep going until the guage maxes out then this is not correct but usable.

The other engine could also have had some carbon buildup on the pistons and head chamber increasing more compression ratio, thus more compression on the guage. YES open the throttle all the way and disable spark and/or fuel.

 

ya my engine was warm, whats WOT? i jus came to his house and we did it right there

ok so put a drop of oil in each cylinder,without the spark plug in it, do each individually? then crank?

oh ya we did start cranking till it maxed out so it coulda been that

 

do all oils at the same time and pull all spark plugs at the same time and check compression with your guage one at a time of course.

 

i also did compression test on my b18c1 ek hatch
cyl 1 180, 180, 180, 180. Hope this helps. Not much more than yours, and i was told my pistons were like new. WHen we took the head off, barely any carbon build up. This compression was when i had a small leak in my headgasket.

 

OH YA! when V-tec hits white smoke comes out, i know its water but cant determine where the leak is coming from, u think thats y results might be low to? could b headgasket or head might be cracked?! i dunno skerry stuff

 

The leak is inside the head, the headgaket is bad, keep an eye on your coolant level, if it is colored then you should see a build up on your spark plug with the bad gasket on that cylinder also, this may take some time though to get a good build up of junk or to discolor the plug.

KAMUSTA KOCHE MO

 

worn headgasket can cause low compression. Am i right? Since 180 reads a bit low

 

The number one thing people do wrong when testing compression is forget to disable the fuel system. This can be done by either pulling the fuel pump fuse or unclipping the injectors from the wiring harness. If this isn't done the injectors will spray fuel into the cylinder while cranking and wash down the cylinder walls, dropping the final number you get. You should not add oil to the cylinders before doing the test as this can artificially increase the readings you get. This was an old fashioned way of trying to determine if the rings were bad or not before leak down testing was used to determine this.

Consistency of the numbers is more important than the final number. Looking at your numbers I'd say that your engine is in good shape and I'll bet that if you do that test over again with the fuel system disabled, those numbers will come up. The last thing to remember is that compression gages vary just like air pressure gages do and that's why comparing your final number results to someone else's is often different.