Compression Test Results

Reply Subscribe

Thread Tools

Search this Thread

Jan 2, 2011 | 02:27 AM

DeAnzaJig

Thread Starter

Senior Member

SL Member

Joined: Jun 2010

Posts: 597

From: Chicago

Compression Test Results

161, 165, 157, 155 on an 05 tc with 71k miles. ok to boost at 8 psi?

Jan 2, 2011 | 02:48 AM

crush02342002

Senior Member

SL Member

iTrader: (2)

Joined: Feb 2008

Posts: 11,271

From: Houston, TX

all those numbers seem low...how did you do the testing? what gauge?

car smoke?

Jan 2, 2011 | 04:08 AM

DeAnzaJig

Thread Starter

Senior Member

SL Member

Joined: Jun 2010

Posts: 597

From: Chicago

i used the OEM brand gauge from autozone. and no smoke. car runs great. great afrs, never any bogging.

Jan 2, 2011 | 04:09 AM

DeAnzaJig

Thread Starter

Senior Member

SL Member

Joined: Jun 2010

Posts: 597

From: Chicago

but i didnt do it operating temperature now that i think about it.....oops, just fricken thought about that

Jan 2, 2011 | 04:28 AM

crush02342002

Senior Member

SL Member

iTrader: (2)

Joined: Feb 2008

Posts: 11,271

From: Houston, TX

thats prolly it then...lol
cause at those pressure levels tends to mean piston damage or valve damage.
bring the car to operating temp and try it again. I bet your readings will be higher

Jan 2, 2011 | 04:34 AM

crush02342002

Senior Member

SL Member

iTrader: (2)

Joined: Feb 2008

Posts: 11,271

From: Houston, TX

they should read close to 180psi@ op temp...if any of the pistons are 10% less than the others you may have a problem. make sure the hose is tight and dab a little oil on the o-ring to make sure the hose seals.

Jan 2, 2011 | 06:16 AM

BlackKnight

Senior Member

Music City Scions
SL Member

Joined: Mar 2009

Posts: 1,372

From: Nashville, TN

How many revolutions did you turn the engine over?

Jan 2, 2011 | 04:26 PM

DeAnzaJig

Thread Starter

Senior Member

SL Member

Joined: Jun 2010

Posts: 597

From: Chicago

i had my friend turn it over while i read the gauge. it seemed like it took a few revs to get the pressure to max out. but im gonna do another test this afternoon at op temp.