Ok, so Honda finally got around to doing the comp test on my car. see thread here https://honda-tech.com/zerothread?id=945852

#1 150
#2 150
#3 148
#4 150

I thought the #'s seem low, but they are telling me that is normal and the highest you will see normally are 160??? and 120 or less would suffice a rebuild..?

previously everyone was telling me that normal #'s would be in the 200 range... so this seems pretty strange.

Here is one of my questions, does elevation, the tester you use or anything else effect your results??

I remember reading numerous thread where someone got certain #'s, but everyone told them not to worry as long as their #'s were w/in a reasonable amount of each other.

according to the C-speed racing site their stock B-series saw about 175-180 across the board.. and according to friends their stock B's saw about 160.. (I don't know of anyone that tested an H)

The thing that is strange is the motor seems perfectly healthy, and runs fine.. what do you guys think?

 

those #'s seem low, have you done a leakdown test as well?

 

Honestly i dont know about those numbers being okay... sound a little low...

i have a 92 h23 with 125k miles on it and when it was tested i got readings of 200,195,200,195

oh and btw that was at Honda

 

Engine temp will affect the results.

But what might be happening is that the compression test wasn't done under WOT. Ideally, you're supposed to relieve the fuel pressure, disable the injectors and ignition, and have the throttle plate 100% open while cranking. We got very similar results on an H22 with the throttle plate closed, then in the 205-215 range under WOT.

Adi

 

The nubers are normal, if they did the test with the throtle closed. If they were cranking the engine with the throtle full open then they are a little low (180-200 would be normal). I would not worry about it too much.

 

was the test done dry or wet?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 577HondaPrelude &raquo;</TD></TR><TR><TD CLASS="quote">The nubers are normal, if they did the test with the throtle closed. If they were cranking the engine with the throtle full open then they are a little low (180-200 would be normal). I would not worry about it too much.</TD></TR></TABLE>

I'd say this is what happened, if they did the test with the throttle closed those numbers would be fine.

When you do a compression test you are supposed to hold the throttle wide open. I'd bet money the tech doing it just forgot this. If you really want to be pain you could make them do it again with throttle open.

I would just try to talk to the tech who did the test and ask him if the throttle was wide open or shut.

 

elevation can also affect the outcome of the numbers,

higher elavation = less density of the air,

 

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

I'd say this is what happened, if they did the test with the throttle closed those numbers would be fine.

When you do a compression test you are supposed to hold the throttle wide open. I'd bet money the tech doing it just forgot this. If you really want to be pain you could make them do it again with throttle open.

I would just try to talk to the tech who did the test and ask him if the throttle was wide open or shut.
</TD></TR></TABLE>

Ok. I just got home, but Ill ask them tommorow how it was done. I'm guessing they did it incorrectly..

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by prelittlelude &raquo;</TD></TR><TR><TD CLASS="quote">elevation can also affect the outcome of the numbers,

higher elavation = less density of the air, </TD></TR></TABLE>

I was thinking that too, but should the test be performed in a sealed environment... I guess what I'm trying to say is the cylinder should be sealed when testing..right?

 

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


I guess what I'm trying to say is the cylinder should be sealed when testing..right?</TD></TR></TABLE>

I want to say yes....

when you take the reading the tester screws in where the spark plug would be. The engine is then turned over (i believe) 6 times and the tester holds the reading.
You have to release the pressure from the gauge before you remove it.

hope that helps

 

Go to Napa/Pep Boys/Autozone and buy the tester for ~40$ and do it yourself. You'll also need tools to remove the spark plugs (might as well swap in new ones) incl gap tool and anti-seize.

Adi

 

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

I want to say yes....

when you take the reading the tester screws in where the spark plug would be. The engine is then turned over (i believe) 6 times and the tester holds the reading.
You have to release the pressure from the gauge before you remove it.

hope that helps </TD></TR></TABLE>

makes sense, elevation shouldn't matter because the pressure w/in the cylinder is sealed.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Quick99Si &raquo;</TD></TR><TR><TD CLASS="quote">Go to Napa/Pep Boys/Autozone and buy the tester for ~40$ and do it yourself. You'll also need tools to remove the spark plugs (might as well swap in new ones) incl gap tool and anti-seize.

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

I plan on doing that as well, basically there is a long drawn out story to this.. I just wanted honda to resolve the issue.