ok just check the compression on my 98 gsr motor (the motor has around 90,000-100,000 miles on it) so this it what it came to....

1st cly 160
2nd cly 150
3rd cly 150
4th cly 150

is this good or bad? rebuild soon? help please

 

does it smoke or consume oil?

 

alittle in vtec...from what my friends told me lol.... i think i did the test wrong i was reading up were somebody said to"Make sure you do the compression test with the engine warm, injectors unplugged, wide open throttle. Crank 5-8 times" but all i did was take one plug out at a time and bump it 3 times then replaced the plug and moved to the next cly

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Honda_Cribb_GS-R &raquo;</TD></TR><TR><TD CLASS="quote">alittle in vtec...from what my friends told me lol.... i think i did the test wrong i was reading up were somebody said to"Make sure you do the compression test with the engine warm, injectors unplugged, wide open throttle. Crank 5-8 times" but all i did was take one plug out at a time and bump it 3 times then replaced the plug and moved to the next cly</TD></TR></TABLE>

thats pretty much right. also take all the plugs out at once

 

those numbers seem "ok"

 

i didnt take all the plugs out or do the wide open throttle thing gonna retest it tomorrow

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Honda_Cribb_GS-R &raquo;</TD></TR><TR><TD CLASS="quote">i didnt take all the plugs out or do the wide open throttle thing gonna retest it tomorrow</TD></TR></TABLE>
no need to remove your plugs.. do one cyl at a time..
Usually takes about 10 full cranks to get the MAX psi per cyl, i usually crank until the needle doesn't move anymore but i usually do 10 per cyl just to make sure, with WOT.

 

If you forgot to unplug your injectors or disable them by pulling the ecu fuse, you're just washing down the cylinders with fuel which gives you much lower compression readings. Make sure your fuel system is disabled before you do it next time.

 

ok sweet thanks guys wish HT had more users like ya'll two doing a retest tomorrow will post results

 

Pfft, HT isn't as cool as me and red_si..

 

lol so what kinda of numbers should i look for tomorrow during the test??

 

don't worry too much about the numbers, they always vary depending on the gauge you're using. All you really want to look for is that the numbers are very close to each other.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 00Red_SiR &raquo;</TD></TR><TR><TD CLASS="quote">don't worry too much about the numbers, they always vary depending on the gauge you're using. All you really want to look for is that the numbers are very close to each other.</TD></TR></TABLE>

Yeap.

 

ok cause i saw some threads were some motors were like 200 all the way across so i was just wondering

 

If fuel was being injected in to the cylinders then you could expect the number to be a little low.

 

ok so i'll just unplug the injectors tomorrow

 

And make sure all the plugs are out so get a decent cranking speed. 5-8 turns should do it. TB fully open.

 

ok sweet so yeah i did the test wrong i didnt unplug the injectors or pull all the spark plugs out

 

 

Higher compression motors will yield higher numbers. so a stock gsr would yield lower numbers than say an itr which are worn in the same. 200s would be awesome for a gsr that has 90k on the odo.

 

still at work should get off soon and gonna retest the compression

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Honda_Cribb_GS-R &raquo;</TD></TR><TR><TD CLASS="quote">still at work should get off soon and gonna retest the compression</TD></TR></TABLE>

In for some results.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DOHCter &raquo;</TD></TR><TR><TD CLASS="quote">Higher compression motors will yield higher numbers. so a stock gsr would yield lower numbers than say an itr which are worn in the same. 200s would be awesome for a gsr that has 90k on the odo.</TD></TR></TABLE>

Yeah, my stock gsr measured 180-195 with 78k miles. After the rebuild, with ITR pistons I measured 195-210

 

ok just did the test took all spark plugs out and unplugged the injectors and this is what i got

1 cly 210
2 cly 210
3 cly 210
4 cly 210

i was stoked with the numbers did the test 3 times just to make sure

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Honda_Cribb_GS-R &raquo;</TD></TR><TR><TD CLASS="quote">ok just did the test took all spark plugs out and unplugged the injectors and this is what i got

1 cly 210
2 cly 210
3 cly 210
4 cly 210

i was stoked with the numbers did the test 3 times just to make sure </TD></TR></TABLE>

Seems pretty healthy.