I just did compression test on my B18C1, cranked 5 times (should I do more? I forgot how many times I do it), did twice on each cylinder.

#1 - 190
#2 - 180
#3 - 190
#4 - 185

I have 2000 GSR with 92k.

By the way how do I do leakdown test?

Comments?

 

help?

 

compression test looks good... leakdown is a bit more complicated. i would tell you how but i dont know how to explain it too well. You would need a air compressor for that also.

 

my stock b18a1 makes better numbers. 185, 186, 185, 186

Your reslts aren't THAT bad, but not considered good either. I think GSR's should have around 210 across.

 

keep cranking till the need stops moving
you will get a more accurate read

my y8 put down about 215across

 

Numbers aren't horrible, but they're by no means great. Do the test on a warmed up engine and crank it over for a few seconds.

 

what about leakdown test? is there a device for that?

 

Try another gauge... my b18c1 w/ 90k miles (motor is '95) yields almost 230psi all the way across.

 

ive tested a cheapo compression gauge vs. a snap on, and the results differed by like 25 psi.

so by just those numbers, dont assume the worst, take the compression on a known perfect motor and then compare them to yours

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92civicb18b1 &raquo;</TD></TR><TR><TD CLASS="quote">my stock b18a1 makes better numbers. 185, 186, 185, 186

Your reslts aren't THAT bad, but not considered good either. I think GSR's should have around 210 across.</TD></TR></TABLE>

YOU CAN'T COMPARE TEST RESULTS BETWEEN DIFFERENT CARS!

I can get the numbers on my compression tested to vary 30, even 40 psi just based on weather and how many times I crank the car. Altitude can have a huge effect. Cams change it too. There are just way too many variables to accurately compare numbers. 3 exactly the same and one 5 psi lower sounds perfectly fine to me.

 

Sure you can if you use the same method.

compression testers are just "peak" pressure gauges. Just crank until the gauge stops climbing. 5 cranks should be enough.

make sure car is warm/hot
pull all spark plugs
pull ecu fuse
screw in tester
floor gas pedal, crank X times
go check gauge

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dustin &raquo;</TD></TR><TR><TD CLASS="quote">Sure you can if you use the same method.

compression testers are just "peak" pressure gauges. Just crank until the gauge stops climbing. 5 cranks should be enough.

make sure car is warm/hot
pull all spark plugs
pull ecu fuse
screw in tester
floor gas pedal, crank X times
go check gauge</TD></TR></TABLE>

Usually you take each plug out one at a time.....

 

Umm why? to make it harder for it to crank?

I've always taken all of them out.

 

They are alittle low--but not bad

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98JRSChatch &raquo;</TD></TR><TR><TD CLASS="quote">They are alittle low--but not bad</TD></TR></TABLE>

agreed

 

it doesnt matter if you take them out one by one or all at one time....i take them out all at once just so it is quick to move the tester from one cylinder to the next

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dustin &raquo;</TD></TR><TR><TD CLASS="quote">Umm why? to make it harder for it to crank?

I've always taken all of them out.</TD></TR></TABLE>

Do you drive your car without any spark plug in? Then why would you do the compression test w/o them in? If that's not enough, then the book says so too.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by racinskittle &raquo;</TD></TR><TR><TD CLASS="quote">Do you drive your car without any spark plug in? Then why would you do the compression test w/o them in? If that's not enough, then the book says so too.</TD></TR></TABLE>

The compression of each cylinder is independent fron one another, so it doesn't matter whether you put the other ones in or not.

I think I'll redo my copression test with more cranks, who knows the needle actually is still increasing, last time I always stop at 5 cranks.

 

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

Do you drive your car without any spark plug in? Then why would you do the compression test w/o them in? If that's not enough, then the book says so too.</TD></TR></TABLE>

No, but I also don't drive my car with a compression tester screwed in where a spark plug is.

All a compression test does is determine the peak pressure a cylinder can reach while the engine is spinning at low RPM. Leaving the extra plugs in is just making it harder to crank your motor, using more of the battery, etc. The book probably says to do them individually so that honda techs don't drop crap down in the cylinders while the motor is cranking.

 

numbers seem a bit low, but still safe

my 196k mile d16z6 tested out at 195 across the board

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dustin &raquo;</TD></TR><TR><TD CLASS="quote">No, but I also don't drive my car with a compression tester screwed in where a spark plug is.

All a compression test does is determine the peak pressure a cylinder can reach while the engine is spinning at low RPM. Leaving the extra plugs in is just making it harder to crank your motor, using more of the battery, etc. The book probably says to do them individually so that honda techs don't drop crap down in the cylinders while the motor is cranking.</TD></TR></TABLE>

NO, the compression test is to be done at a certain RPM. If the motors sped up by removing all the plugs, what's going to happen to your results?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cheberlet302 &raquo;</TD></TR><TR><TD CLASS="quote">numbers seem a bit low, but still safe

my 196k mile d16z6 tested out at 195 across the board</TD></TR></TABLE>

Yeah come to think of it, mine came out @ 190 across. His are pretty low.

 

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

NO, the compression test is to be done at a certain RPM. If the motors sped up by removing all the plugs, what's going to happen to your results? </TD></TR></TABLE>

Umm it's being spun by the starter. how fast do you think it's going? It's is not going to matter either way.

 

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

NO, the compression test is to be done at a certain RPM. If the motors sped up by removing all the plugs, what's going to happen to your results? </TD></TR></TABLE>

Not to be a dick, but I have never EVER heard of that.

I've done a compression and leakdown test on my motor when I change my oil and have done it like dustin said:

for(int i=0; i &lt; 4; i++)

{

1. Warm car
2. take out all spark plugs
3. screw tester in
4. get in car at WOT cank it X times
5. check gauge

}

I have a C# foreach() if anyone wants to see it

 

seems okay