 Compression and hydro cam valve adjustment, I'll have a combo platter |
|
|
|
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. |
|
|
  |
| SGB |
  Nov 12 2006, 07:47 PM
Post
#1
|
|
just visiting  Group: Members Posts: 4,086 Joined: 8-March 03 From: Huntsville, AL Member No.: 404 Region Association: South East States  |
Our story thus far-
Carbs are off. Plugs are out. Valve covers are off. Compression results: #1: 110 psi #2: 130 psi #3 121 psi #4 125 psi This was AFTER I did a really thorough valve job going around and around to each valve until I was sure they were all 1/2 to 2/3 turn past contact. hmmmm. I studied the orientation of the screw slots on #2. Exhaust about 3:00 oclock, Intake at about 1:30. I reset # 3 screws to more closely duplicate this - required maybe 1/4 to 1/2 turn. Retested compression. Now it was 128 psi. Long story short: I've readjusted the valves again to achieve the highest compression. Didn't increase or decrease any setting more than 1/2 turn one way or the other. #1: still messing with it #2: 130 psi #3 128 psi #4 130 psi This seems like a really optimum setting. -OR- Iz this REALLY STUPID? uh, could be. Opinions? Experiences? Mild interest? Speak to me. (this post edited to correct porely remembered results- #1 especially) Attached thumbnail(s) 
|
   |
 
|
| Jake Raby |
Nov 12 2006, 09:59 PM
Post
#2
|
|
Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Scott,
Did you do the test with the throttle wide open?? It appears that you did with the rags shoved in the intakes... The throttle position plays a key role with a compresion test.. Now... Nothing tells the tale like a leak down test. Grab a leak down tester and do the tests with the poiston @ TDC and the engine warm.. Do some searches here for the entire procedure as I explained it to dnhunt a couple of times last year... Leakdown tests are 50% more favorable than a compression test because they not only show an issue, but they also show exactly how bad it is and what the source is (valves, rings, head leaks and etc) |
|
|
|
| SGB |
Nov 12 2006, 11:06 PM
Post
#3
|
|
just visiting Group: Members Posts: 4,086 Joined: 8-March 03 From: Huntsville, AL Member No.: 404 Region Association: South East States |
Jake-
thank for the ree-ply. The rags were out when I tested- just in for the pic. Will a "pressurize the cylinder and listen" LD test be sufficient? I don't even have a compressor, but can borry one and put the comp tester fitting on there. I'll do a search and try to learn a little more about the whole deal. |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 15th May 2024 - 12:23 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.