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skillz2k5 · 06-19-2006, 07:55 PM

So I went and got the gauge set from orielly's today and checked my compression. I did it three ways because I was getting funky readings the first two times.

The first time I checked it was with all the plugs in except the cylinder I was checking compression on (obviously) and with the fi/em fuse still in. The results were::

D
120
120
130
120
T

The second time I checked all the plugs were in but with the fi/em fuse pulled. The results were:

D
170
170
180
170
T

The third time was with plugs out and fuse out. Also I cranked the car untill the needle on the gauge stopped building (I was figuring this was the correct way to go about it). The results were:

D
215
215
220
215
T

Does the third method/numbers seem correct for a b series vtec motor?? Jdm B16 to be exact. Also I have heard that differences in the numbers isn't a good sign. What would cause a slight change from cylinder to cylinder. Also the D signafies dizzy side and T signafies timing belt side... for those that have no common sense

MXDesa · 06-19-2006, 09:05 PM

It is very rare to get the same number all across the board. Your numbers are beautiful. Nice and healthy.

cashen · 06-19-2006, 09:12 PM

Difference in compression is usually a headgasket or rings problem. Here's the write up from the tech articles. I'd just quote it but I don't know how to do that. I don't think you have a problem with yours being so close together though.
How to: Leak down and Compression tests

GSRCIVICTN · 06-20-2006, 12:20 AM

I know you don't have a problem with those numbers.
---CLEAN BILL OF HEALTH---

MXDesa · 06-20-2006, 06:03 AM

Quote:

Originally Posted by cashen

Difference in compression is usually a headgasket or rings problem. Here's the write up from the tech articles. I'd just quote it but I don't know how to do that. I don't think you have a problem with yours being so close together though.
How to: Leak down and Compression tests

Difference in compression doesn't mean any of those are bad. you can have up to a 15%-20% diflection in compression and the engine will be running perfectly fine.

reckedracing · 06-20-2006, 08:16 AM

did you have the throttle open when you ran these tests?

numbers look excellent to me

skillz2k5 · 06-20-2006, 02:32 PM

The throttle open?? I never thought of that... would this make any difference?
Thanks for all the replys to this but I'm not really looking for advise in the numbers
more or less just the method in which it was done with the corresponding numbers.

reckedracing · 06-20-2006, 02:51 PM

of course it would, lol
the throttle body being open = no air restriction
you would get your peak reading faster, but since you let it spin until it the needle stopped moving then it would all be the same in the end...

skillz2k5 · 06-20-2006, 11:52 PM

ic ic... fortunatley never had the need/want to run a comp test before this so just wanted to make sure everything was done correctly. Thanks for all the help guys!

06-19-2006, 07:55 PM	#1
skillz2k5 Senior Member Join Date: Mar 2005 Location: BFE Posts: 499 iTrader: 0 / 0% Rep Power: 15	Compression Test So I went and got the gauge set from orielly's today and checked my compression. I did it three ways because I was getting funky readings the first two times. The first time I checked it was with all the plugs in except the cylinder I was checking compression on (obviously) and with the fi/em fuse still in. The results were:: D 120 120 130 120 T The second time I checked all the plugs were in but with the fi/em fuse pulled. The results were: D 170 170 180 170 T The third time was with plugs out and fuse out. Also I cranked the car untill the needle on the gauge stopped building (I was figuring this was the correct way to go about it). The results were: D 215 215 220 215 T Does the third method/numbers seem correct for a b series vtec motor?? Jdm B16 to be exact. Also I have heard that differences in the numbers isn't a good sign. What would cause a slight change from cylinder to cylinder. Also the D signafies dizzy side and T signafies timing belt side... for those that have no common sense

06-19-2006, 09:12 PM	#3
cashen Junior Member Join Date: May 2006 Location: Oregon Posts: 27 iTrader: 0 / 0% Rep Power: 8	Difference in compression is usually a headgasket or rings problem. Here's the write up from the tech articles. I'd just quote it but I don't know how to do that. I don't think you have a problem with yours being so close together though. How to: Leak down and Compression tests Last edited by cashen; 06-19-2006 at 09:15 PM.

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06-19-2006, 09:05 PM	#2
MXDesa Senior Member Join Date: Apr 2003 Location: Queens, New York Posts: 927 iTrader: 0 / 0% Rep Power: 26	It is very rare to get the same number all across the board. Your numbers are beautiful. Nice and healthy.

06-20-2006, 12:20 AM	#4
GSRCIVICTN Lost in a sea of rednecks Join Date: Feb 2006 Location: Nashville, TN Age: 31 Posts: 431 iTrader: 0 / 0% Ride: 5th Generation Honda Civics Rep Power: 13	I know you don't have a problem with those numbers. ---CLEAN BILL OF HEALTH---

06-20-2006, 08:16 AM	#6
reckedracing TTIWWOP Join Date: Dec 2002 Location: 845 Area, NY Age: 30 Posts: 15,733 iTrader: 0 / 0% Ride: 90 z6-t hatch, 94 Bagged S10, 91 Lifted Mazda Rep Power: 515	did you have the throttle open when you ran these tests? numbers look excellent to me

06-20-2006, 02:32 PM	#7
skillz2k5 Senior Member Join Date: Mar 2005 Location: BFE Posts: 499 iTrader: 0 / 0% Rep Power: 15	The throttle open?? I never thought of that... would this make any difference? Thanks for all the replys to this but I'm not really looking for advise in the numbers more or less just the method in which it was done with the corresponding numbers.

06-20-2006, 02:51 PM	#8
reckedracing TTIWWOP Join Date: Dec 2002 Location: 845 Area, NY Age: 30 Posts: 15,733 iTrader: 0 / 0% Ride: 90 z6-t hatch, 94 Bagged S10, 91 Lifted Mazda Rep Power: 515	of course it would, lol the throttle body being open = no air restriction you would get your peak reading faster, but since you let it spin until it the needle stopped moving then it would all be the same in the end...

06-20-2006, 11:52 PM	#9
skillz2k5 Senior Member Join Date: Mar 2005 Location: BFE Posts: 499 iTrader: 0 / 0% Rep Power: 15	ic ic... fortunatley never had the need/want to run a comp test before this so just wanted to make sure everything was done correctly. Thanks for all the help guys!

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