 Did heat change my valve adjustment?, Anyone get there compression back after valve adjustment? |
|
|
|
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. |
|
|
| second wind |
 Jul 13 2017, 03:44 PM
Post
#1
|
|
Senior Member  Group: Members Posts: 857 Joined: 30-December 10 From: Los Angeles, California Member No.: 12,543 Region Association: Southern California 
 |
Hey Guys,
It has been warm but my '73 2.0 still runs great. One morning after just a couple of miles it started running slow and weak. Have inspected and changed plugs, wires, etc. and discovered low compression (60 lbs) in number 1 hole. Car starts, idles, runs, but obviously has an issue. My best helpers say a valve adjustment will bring it back for sure. Anyone been through this and any thoughts/ideas will be appreciated. Thank you very much. gg |
   |
 
|
  |
Replies
| Dave_Darling |
Jul 13 2017, 05:54 PM
Post
#2
|
|
914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
|
Heat, given enough of it over a long enough period of time, can change your valve adjustment. Remember, tolerance on those is +- 0.002", which isn't much at all.
Out-of-spec valves can very definitely affect your compression! Your helpers may be correct, and it's very much something to try. Keep an eye on the adjustments, though. If there is one valve that keeps closing up, it is stretching and you need to rebuild the heads before the valve breaks up and does the fandango all over your cylinder head and piston top. --DD |
|
|
|
| second wind |
Jul 13 2017, 09:31 PM
Post
#3
|
|
Senior Member Group: Members Posts: 857 Joined: 30-December 10 From: Los Angeles, California Member No.: 12,543 Region Association: Southern California
|
QUOTE(Dave_Darling @ Jul 13 2017, 03:54 PM)  Heat, given enough of it over a long enough period of time, can change your valve adjustment. Remember, tolerance on those is +- 0.002", which isn't much at all. Out-of-spec valves can very definitely affect your compression! Your helpers may be correct, and it's very much something to try. Keep an eye on the adjustments, though. If there is one valve that keeps closing up, it is stretching and you need to rebuild the heads before the valve breaks up and does the fandango all over your cylinder head and piston top. --DD Thank you DD.....engine has maybe 20,000 miles on it and 1,500 since last valve adjust.....the low compression says plenty.....hopefully minor not major.....you know the feeling.... gg |
|
|
|
| second wind |
Jul 13 2017, 09:34 PM
Post
#4
|
|
Senior Member Group: Members Posts: 857 Joined: 30-December 10 From: Los Angeles, California Member No.: 12,543 Region Association: Southern California
|
QUOTE(second wind @ Jul 13 2017, 07:31 PM) QUOTE(Dave_Darling @ Jul 13 2017, 03:54 PM) Heat, given enough of it over a long enough period of time, can change your valve adjustment. Remember, tolerance on those is +- 0.002", which isn't much at all. Out-of-spec valves can very definitely affect your compression! Your helpers may be correct, and it's very much something to try. Keep an eye on the adjustments, though. If there is one valve that keeps closing up, it is stretching and you need to rebuild the heads before the valve breaks up and does the fandango all over your cylinder head and piston top. --DD Thank you DD.....engine has maybe 20,000 miles on it and 1,500 since last valve adjust.....the low compression says plenty.....hopefully minor not major.....you know the feeling.... gg Also....added CH temp gauge since rebuild.....never gets close to hot...oil hit 275 degrees however at WCR.....ran fine for another 500 miles...just so you know...thank you... gg |
|
|
|
Posts in this topic
second wind Did heat change my valve adjustment? Jul 13 2017, 03:44 PM
The Cabinetmaker How did you add a ch sensor? Pics please. Jul 14 2017, 06:41 AM second wind
How did you add a ch sensor? Pics please.
I put... Jul 14 2017, 11:24 AM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 16th June 2024 - 02:52 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.