OK.. i just did some archive research but i want to verify a few things...

first---> why would u want to do a wet compression test? i dont really understand the point of doing the test without removing the fuse for the fuel injection. Will the compression readings be different?

second---> it seems that strong b16's run 200 something across all 4 cylunders. So besides having 200 some odd psi in each cylinder, it is important to look at the variations from one cylinder to another... say one cyclinder shouldn't be any more than 20-30 psi higher or lower than another?

third---> besides doing it myself... approx how much would a garage charge for me to have a compression test done?.. im looking into buying a b16 crx and i want to have the compression tested, but i doubt the dealer would let me do it myself...

fourth --> kinda off topic... but any other suggestions to make sure that the swap is running well?

thanks




Modified by lothian110 at 2:11 PM 10/28/2003

 

i must say im a little shocked to see no one has replied yet!
you guys are usually so eager to share information and argue with eachother...

where have all the gurus gone?

 

First : A compression test gives a general condition of the motor. It tests how well the valve seals and piston rings are doing their job. You remove the fuse to prevent flooding the engine and after so many cranks the reading will be diff as more and more fuel is dumped into the cylinder.

Second : Most b16s do run above 200psi, your basically looking for consistancy as some testers can vary. Your highest cylinder shoudlnt be more than 15% (20-25psi) off than your lowest.

Third : A shop should only charge you 1hr labor to do it, so like $30-50 depending. You can get your own tester for like 15-30 and its very easy to do.

Fourth : Basic things to check for to know its running good is to visually look for leaks, change the oil early to see how much gunk is in there. Monitor what kind of gas mileage your getting and check the wear on your spark plugs.

Thats about it, hope that helped.

 

my first question is regarding why people would decide NOT to remove the fuse for fuel injection... in the archives i was reading posts about people doing it purposely and calling it wet compression tests... i guess they are just strange ... isnt that veird...

thanks alot for your help...

 

Wet compression testing is where you add a cap full of oil to the cylinder, if your test improves dramaticlly with the oil added you have bad rings. I wouldn't leave the fuel plugged in sounds like a problem waiting to happen. CRXs dont have a fuel injection fuse, I always pull both the ECU fuses so the injectors dont pulse.

 

rather than adding oil to each cylinder, i prefer to just test the motor when its hot. that will give high consistent numbers. also, i recommend just buying a tester and doing it yourself. consider it an investment - that way you can test it whenever you want if you suspect something is wrong. also you can test motors for your friends and stuff too.