DIY: Compression Test! Lots of pics - Page 2

Survivor · 03-18-2008, 12:19 AM

Quote:

Originally Posted by rotor_powerd

I've seen a 8.5:1 VR6 put out 210 PSI in more than 1 cylinder.

Probably the cam itself was advanced which can cause an increase in pressure.

20civic07 · 03-19-2008, 04:52 AM

i'm sure people will want to know how to do this so im bumping this

**ErichPryde** · 03-19-2008, 05:06 AM

Moved into the DIY index. very nice!

fg2!kid · 03-23-2008, 01:37 AM

cylinder volume has a roll in what kind of reading you get from enging to engine too

rcracin13 · 03-24-2008, 03:30 PM

+ REP FOR YOU

I've been waiting for something like this for a while. you're awesome

20civic07 · 03-24-2008, 04:40 PM

took a while to get put in the diy forums haha... i dont know why i couldnt post in there anymore.. but my compression was around 185 across all four cylinders... factory manual says 135 +-28psi. i talked to several techs at the dealership, they said that 185 seems normal, very healthy, 135 +- 28 seems wrong.

20civic07 · 04-09-2008, 02:24 AM

anyone else get results for their test?

bluek20z3 · 07-18-2008, 01:31 AM

Quote:

Originally Posted by 20civic07

took a while to get put in the diy forums haha... i dont know why i couldnt post in there anymore.. but my compression was around 185 across all four cylinders... factory manual says 135 +-28psi. i talked to several techs at the dealership, they said that 185 seems normal, very healthy, 135 +- 28 seems wrong.

when you do this test in the FSM it says to keep the gas floored read the manual i have all data pro

GlxyGry06Si · 08-04-2008, 04:15 PM

ok. lets say that your compression is low in one of your cylinders what is the problem? How do you fix it?

kenny rogers · 08-04-2008, 04:34 PM

Quote:

Originally Posted by GlxyGry06Si

ok. lets say that your compression is low in one of your cylinders what is the problem? How do you fix it?

At that point you will need to do a Leakdown test to determine what is causing the low compression.

GlxyGry06Si · 08-04-2008, 04:35 PM

Quote:

Originally Posted by kenny rogers

At that point you will need to do a Leakdown test to determine what is causing the low compression.

and what are some common reasons why something would cause low compression. when you lose compression what happens to the car? (poor mpg, performance, ect)

kenny rogers · 08-05-2008, 04:17 PM

^^^ There are a number of different reasons for compression loss... most of them expensive fixes. Valves, pistons, rings, headgasket... to find out which one it is you do a leakdown test.

20civic07 · 08-13-2008, 02:04 AM

if you have loss of compression in one of the cylinders, you best take it to a qualified mechanic if you don't know how to diagnose it yourself.

rotor_powerd · 08-20-2008, 11:10 AM

Quote:

Originally Posted by GlxyGry06Si

and what are some common reasons why something would cause low compression.

Bad piston rings, bent valves, blown headgasket.

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20civic07 Senior Member Join Date: Mar 2007 Posts: 1,340 iTrader: 8 / 100%	i'm sure people will want to know how to do this so im bumping this

03-23-2008, 01:37 AM	#24 (permalink)
fg2!kid Senior Member Join Date: Jun 2007 Location: montclair Cali Age: 21 Posts: 1,186 エリク eric iTrader: 0 / 0%	cylinder volume has a roll in what kind of reading you get from enging to engine too

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rcracin13 Senior Member Member Join Date: Apr 2007 Location: Queens, NYC Age: 20 Posts: 1,467 iTrader: 7 / 100%	+ REP FOR YOU I've been waiting for something like this for a while. you're awesome

03-24-2008, 04:40 PM	#26 (permalink)
20civic07 Senior Member Join Date: Mar 2007 Posts: 1,340 iTrader: 8 / 100%	took a while to get put in the diy forums haha... i dont know why i couldnt post in there anymore.. but my compression was around 185 across all four cylinders... factory manual says 135 +-28psi. i talked to several techs at the dealership, they said that 185 seems normal, very healthy, 135 +- 28 seems wrong.

04-09-2008, 02:24 AM	#27 (permalink)
20civic07 Senior Member Join Date: Mar 2007 Posts: 1,340 iTrader: 8 / 100%	anyone else get results for their test?

08-04-2008, 04:15 PM	#29 (permalink)
GlxyGry06Si Senior Member Join Date: May 2006 Location: Jacksonville, AR Age: 23 Posts: 6,504 iTrader: 3 / 100%	ok. lets say that your compression is low in one of your cylinders what is the problem? How do you fix it?

08-05-2008, 04:17 PM	#32 (permalink)
kenny rogers Senior Member Join Date: Sep 2007 Location: Western Washington Posts: 251 Greg iTrader: 0 / 0%	^^^ There are a number of different reasons for compression loss... most of them expensive fixes. Valves, pistons, rings, headgasket... to find out which one it is you do a leakdown test.

08-13-2008, 02:04 AM	#33 (permalink)
20civic07 Senior Member Join Date: Mar 2007 Posts: 1,340 iTrader: 8 / 100%	if you have loss of compression in one of the cylinders, you best take it to a qualified mechanic if you don't know how to diagnose it yourself.