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+--- Thread: so i did a compression test... (/showthread.php?tid=2482)
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so i did a compression test... - Sijray21 - 07-07-2005
Here's what the cylinder's threw at me:
the first test was about 4 turns, the next one was about 8-10 turns
1 - 215, 220
2 - 210, 220
3 - 160, 190
4 - 225, 230
The third cylinder threw significantly lower than the rest, but what do you think of the numbers? The spark plugs looked clean to me, no discoloration of white or black, but here's why i performed the test.
Other than my previous problem of losing oil, i recently took a cross country trip and i burned 10...yes 10 quarts of oil. (more on this later, i'm planning on starting a thread once i get the pictures organized, and i'm a lazy ass) Could the problem be the valve retainers? The next thing on the agenda is a leak down test.
Some of the specs on the car include: Tuned maintenance, slacking with the later regular maintenance things, using Mobile 1 5w-30 (thinking of switching to something thicker), and there is 144300 (about) miles on the car. Stock everything internally. There is also a black film of crap on the trunk above the exhaust tip.
- .RJ - 07-07-2005
Did you hold the loud pedal at 'wide open' while you cranked the motor.... and pull the fuel injection fuse?
- mpg9999 - 07-07-2005
.RJ Wrote:Did you hold the loud pedal at 'wide open' while you cranked the motor.... and pull the fuel injection fuse?
Yes and yes. Had he not, all of the numbers would be low. Next step is to add oil to the cylinder and see if it raises the compression.
- Sijray21 - 07-07-2005
.RJ Wrote:Did you hold the loud pedal at 'wide open' while you cranked the motor.... and pull the fuel injection fuse?
yeah
- .RJ - 07-07-2005
Possible you have a dinged valve.... or your rings are shot. When you changed the earl last, did it look really thin coming out? (thinking bad rings = fuel dilution)
- mpg9999 - 07-07-2005
.RJ Wrote:Possible you have a dinged valve.... or your rings are shot. When you changed the earl last, did it look really thin coming out? (thinking bad rings = fuel dilution)
Also consider sending the oil to blackston labs. Thats the best way to see how much fuel is in the oil.
- ScottyB - 07-07-2005
i'm tempted to think it's his rings. reason being, even if the compression is low, a dinged valve wouldnt cause the car to loose quarts of oil at a time.
- Evan - 07-07-2005
a dinged valve should show a bigger compression drop than just 15%
IMO thats not much to even worry about
- BLINGMW - 07-07-2005
yeah, do the "add a drop of oil" thing and test again, tell us how it goes
- Sijray21 - 07-07-2005
BLINGMW Wrote:yeah, do the "add a drop of oil" thing and test again, tell us how it goes
just add one drop into the chamber before the test? I've never heard of it before.
- .RJ - 07-07-2005
Nah, a capful... like from your earl bottle
- Sijray21 - 07-09-2005
ok, i did the compression test again, dry and wet
here are the numbers: (i did each test twice with about 7 turns each -- same numbers)
4, 3, 2, 1 ----- Cylinder
230, 220, 210, 210 ---- DRY
285, 285, 285, 255 ---- WET
so i take it since the numbers have a big difference then it's the rings, right?......:hammer:.....
aving for rebuild:first off, i think these are kinda high numbers for a stock b16, but is that 18-23% increase because the rings are going bad? just trying to understand what's going on, does the extra oil help fil the 'gap' between the rings and the cylinder walls - holding compression better?
- Evan - 07-09-2005
they will always increase by a large margin when wet.
those numbers are fine, nothing wrong with your engine.
- .RJ - 07-09-2005
Well, according to your frame of reference "busted engine" is
- Evan - 07-09-2005
.RJ Wrote:Well, according to your frame of reference "busted engine" ishah, I knew that was coming. but you should work on your engilsh, mr yoda.
- BLINGMW - 07-09-2005
yeah, your dry #'s got a lot more even. They look ok now. I don't know what to tell you! Leakdown test time? :lol:
- JackoliciousLegs - 07-09-2005
sell it now... use the money towards the gti.
- ViPER1313 - 07-09-2005
You did the test w/ the engine hot, right?
- Dave - 07-09-2005
your car seems to have just been having a bad day :-)
- ViPER1313 - 07-10-2005
Nah, ask Chris, it just fixed itself - Honda's are known for it 8) .