Notices
Evo How To Requests / Questions / Tips If you're looking for a how-to on something, ask in here.

Compression Test How-To

 
Old Oct 5, 2009, 10:38 AM
  #31  
Evolved Member
iTrader: (33)
 
Join Date: Jun 2005
Location: Hagerstown
Posts: 3,044
Likes: 0
Received 1 Like on 1 Post
I think I will do this tonight, to check my valve stem seals and see just how bad my head gasket leak is...
kmcconn9 is offline  
Old Oct 13, 2009, 06:17 PM
  #32  
Evolved Member
iTrader: (9)
 
Macaroni's Avatar
 
Join Date: Feb 2008
Location: Pensacola, FL
Posts: 945
Likes: 0
Received 0 Likes on 0 Posts
Mine came out at 150 across the board. My heart sank at first cause I thought that was bad lol. Good thing I searched on here before getting all emo lol.
Macaroni is offline  
Old Oct 16, 2009, 10:36 AM
  #33  
Newbie
iTrader: (2)
 
Greenspeed's Avatar
 
Join Date: Oct 2006
Location: Berkeley, CA
Posts: 54
Likes: 0
Received 0 Likes on 0 Posts
Really helpful info thanks!
Greenspeed is offline  
Old Oct 31, 2009, 01:46 PM
  #34  
Evolving Member
iTrader: (5)
 
garcias2k's Avatar
 
Join Date: Jul 2006
Location: CO Springs
Posts: 385
Likes: 0
Received 0 Likes on 0 Posts
140, 130, 130 and 135. It's ok cause I'm planning on building the motor. I just needed to know why I couldn't push more than 26psi on a aka green. No boost leaks as well for max psi.
garcias2k is offline  
Old Oct 31, 2009, 05:35 PM
  #35  
NSS
Evolving Member
iTrader: (14)
 
Join Date: Feb 2009
Location: Maine
Posts: 103
Likes: 0
Received 0 Likes on 0 Posts
This is a good how to
NSS is offline  
Old Dec 5, 2009, 05:28 PM
  #36  
Evolved Member
iTrader: (21)
 
Join Date: Aug 2008
Location: Wisconsin
Posts: 594
Likes: 0
Received 0 Likes on 0 Posts
Great thread.. how much lower would you expect if you did't have the throttle @ wot during the test? Forgot to do that and got 150-155 psi across the board.
Nasty Evolution is offline  
Old May 23, 2010, 06:23 PM
  #37  
Evolved Member
iTrader: (7)
 
DBallz's Avatar
 
Join Date: Sep 2004
Location: South Beach, FL / Miami, FL / Pt. St. Lucie, FL / NYC
Posts: 1,458
Likes: 0
Received 0 Likes on 0 Posts
5 cranks 175-172-175-172

70K stock block and head!
DBallz is offline  
Old May 23, 2010, 06:35 PM
  #38  
Evolving Member
iTrader: (22)
 
Join Date: Feb 2010
Location: Rapids Coon, MN
Posts: 176
Likes: 0
Received 0 Likes on 0 Posts
Great write up. I havent had a chance to do mines but what is the compression number that they should be to have a healthy motor.
pennies_hatchie is offline  
Old Jun 2, 2010, 03:10 PM
  #39  
Newbie
 
zoek24's Avatar
 
Join Date: Oct 2008
Location: SLC
Posts: 57
Likes: 0
Received 0 Likes on 0 Posts
Just did my test and the results are:

136, 137, 134, 140

Knowing that I have 272 cams would you say these numbers are ok?
zoek24 is offline  
Old Aug 14, 2010, 08:58 AM
  #40  
Evolving Member
 
BillSpec's Avatar
 
Join Date: Mar 2010
Location: Behind a laptop in FLA
Posts: 323
Likes: 0
Received 0 Likes on 0 Posts
BUMP FROM THE DEaD...

DID ONE A FEW MONTHS BACK...

EVO IX STOCK BLOCK AND HEAD WITH COSSIE M2'S... 225-220 ACROSS THE BOARD... HMMM

Seems kinda high
BillSpec is offline  
Old Sep 11, 2010, 12:57 PM
  #41  
Evolving Member
iTrader: (6)
 
Join Date: Jun 2004
Location: Yukon, Ok
Posts: 188
Likes: 0
Received 0 Likes on 0 Posts
another bump from the dead. Can this be done with the engine fully cooled down. I'm in the process of removing the radiator but I want to do a compression test to make sure the headgasket isn't dead. Any help appreciated.I tried it without the radiator hooked up and the first two cylinders read 0..I haven't tested the others yet. Hopefully I'm doing something wrong.

Last edited by evoracing; Sep 11, 2010 at 02:35 PM.
evoracing is offline  
Old Sep 2, 2011, 10:24 AM
  #42  
Newbie
 
Join Date: Aug 2011
Location: Brooklyn
Posts: 10
Likes: 0
Received 0 Likes on 0 Posts
Just want to add this for people who have IXs, the above values are for VIIIs ONLY!

I did a compression test today on my IX and my heart sank because I got 140-150-150-140...until I did some searching. Apparently on the IXs the compression thresholds are waaaaay different.

The standard is 145

The minimum is 92 (you read that right, 92!)

Please add this to the OP if possible, it'll probably save a lot of IX guys a heart attack.
AlphaRemix is offline  
Old Sep 2, 2011, 10:27 AM
  #43  
Newbie
iTrader: (1)
 
Join Date: Aug 2010
Location: Oakland
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
I'm pretty sure alot of times that as long as the readings are within 10% of each other , then you should be good
black_dc4 is offline  
Old Sep 2, 2011, 03:37 PM
  #44  
Evolving Member
iTrader: (52)
 
GBAILEY472's Avatar
 
Join Date: Sep 2008
Location: Canada
Posts: 224
Received 0 Likes on 0 Posts
I recently go my shortblock rebuilt., pretty much the works, but we decided to go with Wiesco forged coated piston with .020 over. and 9:0:1 compression. Is this in theory supposed to UP compression let say Evo 9 stock from a 135 to 160?
GBAILEY472 is offline  
Old Mar 31, 2012, 04:28 PM
  #45  
Evolving Member
iTrader: (3)
 
Join Date: Jul 2011
Location: Charleston WV
Posts: 134
Likes: 0
Received 1 Like on 1 Post
Stock 2005 Evo VIII, 67000 miles, while idling, the cylinder pressure is 110 psi in two cylinders, 108 in the other two. Runs fine, doesn't smoke, doesn't use oil. Is this normal for an idling motor? I don't have the opportunity to go back and do it the suggested way.
tmaddox is offline  

Thread Tools
Search this Thread
Quick Reply: Compression Test How-To


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.