My rebuilt h22a has been burning oil ever since the rebuilt (3,000miles) Someone suggested I should do a compression test to see if it was the rings I came up with 172 172 172 172 all the same

does anybody know if this is normal?

My set up

head
crower stage 2 cams
crower valves
crower springs and retainers
port and polish (gasket match)

stock bottom end

 

well its good there all the same. i dont know about the number since youve done internal work, but my stock jdm h22 compression tested like 200 210 205 210 somethign like that

 

it's very possible that the problem lies in your rings around the pistons!
I had the same problem with my h23.

 

your compressions low.

 

correct me if Im wrong but doesnt oil on my electrodes on my spark plugs mean bad rings?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96vtecI4 &raquo;</TD></TR><TR><TD CLASS="quote">your compressions low. </TD></TR></TABLE>

 

jdm h22

220 across


1dopesi, is your's a usdm h22?

 

You can try to see if its really piston rings by puting a little bit of oil in the cylinder and do a compression again. The oil will help seal the rings so if your compression rises it's the rings or you got some scaring on the walls.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ludecz &raquo;</TD></TR><TR><TD CLASS="quote">You can try to see if its really piston rings by puting a little bit of oil in the cylinder and do a compression again. The oil will help seal the rings so if your compression rises it's the rings or you got some scaring on the walls.</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ludecz &raquo;</TD></TR><TR><TD CLASS="quote">You can try to see if its really piston rings by puting a little bit of oil in the cylinder and do a compression again. The oil will help seal the rings so if your compression rises it's the rings or you got some scaring on the walls.</TD></TR></TABLE>

 

This is a jdm engine

If 220 all across means I'm way low but my are all even I dont get it!!!

[QUOTE=SKDRCR]jdm h22

220 across

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1dopesi &raquo;</TD></TR><TR><TD CLASS="quote">This is a jdm engine

If 220 all across means I'm way low but my are all even I dont get it!!!

[QUOTE=SKDRCR]jdm h22

220 across


</TD></TR></TABLE>

Yes, that is way low for a freshly built jdm engine.

Do the cap of oil in the cylinder test like ludecz said.

 

has anyone ever really compared a compression test on a stock bottom end with aftermarket, long duration cams to a compression test on the same motor but with stock cams? i would think the longer duration would affect your dynamic compression at low RPM and that would give you a lower compression reading? anyone?

 

threadjack/ mines came at 165 196 200 165 for my h22a4 gotta rebuild my cylinder heads and valves =[ JG FTW!!!

 

could low oil cause low compression?

I guess it makes sense....


Ill just have to do it again!!!

 

Hold the throttle wide open during cranking, pull out All the spark plugs during the test.

My jdm H22a averaged 220psi

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1dopesi &raquo;</TD></TR><TR><TD CLASS="quote">could low oil cause low compression?

I guess it makes sense....


Ill just have to do it again!!!</TD></TR></TABLE>

absolutely! the helms says to make sure your oil is topped off before you do the compression check.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bluedlude &raquo;</TD></TR><TR><TD CLASS="quote">has anyone ever really compared a compression test on a stock bottom end with aftermarket, long duration cams to a compression test on the same motor but with stock cams? i would think the longer duration would affect your dynamic compression at low RPM and that would give you a lower compression reading? anyone?</TD></TR></TABLE>

well, yea. Especially if you are using stock compression. Take matts motor for instance. His crower3's drain the hell out of his compression.

longer duration = less time to build compression....right?

 

well u figure ur giving the engine less time to compress the mixture with a longer duration cam. Thats why they say to run atleast a certain compression piston when going with longer duration cams.

As for it actually taking away compression im not 100% sure on that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">

well, yea. Especially if you are using stock compression. Take matts motor for instance. His crower3's drain the hell out of his compression.

longer duration = less time to build compression....right?</TD></TR></TABLE>

a larger aftermarket cam only causes a compression drop when vtec is engaged, any other time its using the smaller lobes. when checking compression you will be using the small lobes, so no it wont cause a drop.


i have never tested any usdm h22s, but all of the stock jdm h22s i have tested were between 240-260 psi. keep in mind, this is w/ a head that was sealing up 100%

add a 12:1-13:1 compression bottom end and it will max out the guage @ 300psi.

as long as you are getting within 15 psi of eacother all across, i wouldnt worry about the number. every guage will read different and some are way off.

the most important thing is that they are all close to eachother, otherwise there is a problem somewhere. if they are all exactly the same or even within 15 psi you are good to go

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Missing Gears &raquo;</TD></TR><TR><TD CLASS="quote">

a larger aftermarket cam only causes a compression drop when vtec is engaged, any other time its using the smaller lobes. when checking compression you will be using the small lobes, so no it wont cause a drop.

</TD></TR></TABLE>

didnt even think of that, thanks

what about the crowers with modified idle lobes?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Missing Gears &raquo;</TD></TR><TR><TD CLASS="quote">a larger aftermarket cam only causes a compression drop when vtec is engaged, any other time its using the smaller lobes. when checking compression you will be using the small lobes, so no it wont cause a drop.


i have never tested any usdm h22s, but all of the stock jdm h22s i have tested were between 240-260 psi. keep in mind, this is w/ a head that was sealing up 100%

add a 12:1-13:1 compression bottom end and it will max out the guage @ 300psi.

as long as you are getting within 15 psi of eacother all across, i wouldnt worry about the number. every guage will read different and some are way off.

the most important thing is that they are all close to eachother, otherwise there is a problem somewhere. if they are all exactly the same or even within 15 psi you are good to go </TD></TR></TABLE>

very true, where was my brain .

my USDM has always read between 210 and 200 PSI

 

So, my compression is still really low....... if my crower2 cams dont drain compression

170 172 172 172 anybody?

 

Use a different guage because if its the same all the way accross then it could be higher and the tester is just messed up. Its a longshot but its worth a try.