Compression Test Results

Reply Subscribe

Thread Tools

Search this Thread

01-02-2011, 02:27 AM

DeAnzaJig

Senior Member

SL Member

Thread Starter

Join Date: Jun 2010

Location: Chicago

Posts: 597

Compression Test Results

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

01-02-2011, 02:48 AM

crush02342002

Senior Member

SL Member

iTrader: (2)

Join Date: Feb 2008

Location: Houston, TX

Posts: 11,271

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

car smoke?

01-02-2011, 04:08 AM

DeAnzaJig

Senior Member

SL Member

Thread Starter

Join Date: Jun 2010

Location: Chicago

Posts: 597

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

01-02-2011, 04:09 AM

DeAnzaJig

Senior Member

SL Member

Thread Starter

Join Date: Jun 2010

Location: Chicago

Posts: 597

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

01-02-2011, 04:28 AM

crush02342002

Senior Member

SL Member

iTrader: (2)

Join Date: Feb 2008

Location: Houston, TX

Posts: 11,271

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

01-02-2011, 04:34 AM

crush02342002

Senior Member

SL Member

iTrader: (2)

Join Date: Feb 2008

Location: Houston, TX

Posts: 11,271

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.

01-02-2011, 06:16 AM

BlackKnight

Senior Member

Music City Scions
SL Member

Join Date: Mar 2009

Location: Nashville, TN

Posts: 1,372

How many revolutions did you turn the engine over?

01-02-2011, 04:26 PM

DeAnzaJig

Senior Member

SL Member

Thread Starter

Join Date: Jun 2010

Location: Chicago

Posts: 597

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.