Notices
Evo Engine / Turbo / Drivetrain Everything from engine management to the best clutch and flywheel.

Leakdown/Compression #'s?

Thread Tools
 
Search this Thread
 
Old Jun 27, 2005 | 11:56 AM
  #1  
Fast Frank's Avatar
Thread Starter
Evolving Member
iTrader: (19)
 
Joined: Jun 2005
Posts: 182
Likes: 0
From: D
Leakdown/Compression #'s?

After the "White rabbit" was installed I was on the way to the tuner & I thought I hurt something (fortunately it was a couple of hoses that popped off)
Anyway, In the process a leakdown/compression test was done & the #'s were consistent, but seemed low-I don't remember what they were right now(low 100's?)-
Some help please & thank you?
Reply
Old Jun 27, 2005 | 12:06 PM
  #2  
SuperchargedGTZ's Avatar
Evolved Member
iTrader: (4)
 
Joined: Feb 2003
Posts: 946
Likes: 0
From: Gilbert, AZ
when i did a compression test on my car a while ago, i am pretty sure i was consistent 168-171 across all four cylinders. i will check and make sure though
Reply
Old Jun 27, 2005 | 07:48 PM
  #3  
Fast Frank's Avatar
Thread Starter
Evolving Member
iTrader: (19)
 
Joined: Jun 2005
Posts: 182
Likes: 0
From: D
Thanks!
Reply
Old Jun 27, 2005 | 08:02 PM
  #4  
Compjoc's Avatar
Evolved Member
iTrader: (21)
 
Joined: Jun 2003
Posts: 1,018
Likes: 0
From: Kansas City
Pressures vary between pressure gauges that read that high. If you worried about it, try a different brand compression gauge.
Reply
Old Jun 27, 2005 | 08:10 PM
  #5  
GOKOU's Avatar
Evolved Member
iTrader: (2)
 
Joined: Mar 2004
Posts: 1,762
Likes: 0
100 is too low. I believe the service manual mention 165 as the minimum for normal.
Reply
Old Jun 27, 2005 | 11:35 PM
  #6  
megatron's Avatar
Evolving Member
iTrader: (6)
 
Joined: Dec 2003
Posts: 273
Likes: 0
From: Bay Area
where did you buy the white rabbit and how much? forceperformance?
Reply
Old Jun 28, 2005 | 04:31 AM
  #7  
Ted B's Avatar
EvoM Guru
20 Year Member
Photogenic
Photoriffic
Liked
iTrader: (6)
 
Joined: Aug 2004
Posts: 6,334
Likes: 63
From: Birmingham, AL
Originally Posted by Fast Frank
Anyway, In the process a leakdown/compression test was done & the #'s were consistent, but seemed low-I don't remember what they were right now(low 100's?)-
If you install a longer duration cam set (like the HKS 272s you have presently), the static compression numbers will typically be lower than stock because the long cam duration bleeds some of the intake charge at low speeds. Therefore, the factory compression specs do not apply to your setup.

Feel better now?

If you set your cams to something like +2/0, perform the compression test again and watch what happens.

In short, anything that increases top end power at the expense of low speed power will reduce cranking speed compression, so don't be alarmed.
Reply
Old Jun 28, 2005 | 05:11 AM
  #8  
diambo4life's Avatar
Evolving Member
 
Joined: Sep 2003
Posts: 196
Likes: 0
From: OKC
Originally Posted by Ted B
If you install a longer duration cam set (like the HKS 272s you have presently), the static compression numbers will typically be lower than stock because the long cam duration bleeds some of the intake charge at low speeds. Therefore, the factory compression specs do not apply to your setup.

Feel better now?

If you set your cams to something like +2/0, perform the compression test again and watch what happens.

In short, anything that increases top end power at the expense of low speed power will reduce cranking speed compression, so don't be alarmed.
Very true.

Hopefully you did the test (compression) with a good gauge tester, hot vehicle and with the throttle wide open.
Reply




All times are GMT -7. The time now is 06:08 AM.