 Compression Check Acceptable Numbers?, Compression Check |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
| 91422.7 |
 Apr 25 2015, 05:20 PM
Post
#1
|
|
Newbie  Group: Members Posts: 36 Joined: 8-October 14 From: Eugene, Oregon Member No.: 17,991 Region Association: Upper MidWest  |
I'm working on a friends car and we checked the compression with it cold. We retrieved the following readings: #1 cyl 70 lbs, #2-80 lbs., #3-80 lbs., #4-100 lbs., Engine has been running for about 6 months. Based on these readings what do you suggest? Is it ok to go ahead and get the engine running and drive it like it is or are you taking a chance of doing further damage? Run some diesel or ATF through the carbs and see if that would loosen the valves up some, then recheck Compression after a few hundred miles or is it time to tear it down and do a Valve job? Thanks for any suggestions.
|
   |
 
|
  |
Replies
| VaccaRabite |
Apr 26 2015, 06:39 AM
Post
#2
|
|
En Garde! Group: Admin Posts: 13,443 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Check the valves for sure.
Engine needs to be hot so everything is expanded. Throttle needs to be open so the cylinders are getting air. Valves need to be right so you are not leaking air out of a partially opened valve (valve too tight). After that, you can try a thick oil to bring up compression as you said. But at that point, you are ordering parts and saving money for the head rebuild. As DD said, just getting the engine adjusted and hot will bring your numbers up considerably. Zach |
|
|
|
Posts in this topic
91422.7 Compression Check Acceptable Numbers? Apr 25 2015, 05:20 PM
91422.7 I forgot to mention the engine is a 2.0L out of a ... Apr 25 2015, 05:21 PM Vacca Rabite Those are shit numbers.
Was the engine hot, and t... Apr 25 2015, 06:15 PM 91422.7 Engine was cold, throttles (dual Weber 40s) were c... Apr 25 2015, 06:26 PM somd914 Agree numbers are bad, and agree it has to be done... Apr 25 2015, 06:33 PM 91422.7 Sounds good, we will get the engine running, let i... Apr 25 2015, 06:44 PM euro911 Don't be too quick to judge. The #s didn't... Apr 25 2015, 09:02 PM Mike Bellis Make sure the valves are adjusted properly first. Apr 25 2015, 10:00 PM Dave_Darling Adjust the valves and get it running. If those ar... Apr 25 2015, 10:34 PM rgalla9146 The fault with those numbers is mostly the closed ... Apr 26 2015, 08:03 AM
The Cabinetmaker Do like the others have said with all plugs remove... Apr 26 2015, 08:39 AM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 15th May 2024 - 01:14 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.