 Question for Six Engine People, TDC and Z1 mark |
|
|
|
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. |
|
|
| Robarabian |
 Mar 15 2023, 08:48 PM
Post
#1
|
|
914 A Roo  Group: Members Posts: 739 Joined: 11-February 19 From: Simi Valley, Kalifornia Member No.: 22,865 Region Association: Southern California 
 |
I have a 911 engine I am working on. I am practicing setting cam timing so I can feel comfortable with it prior to the tear down. My Crankshaft pulley has a Z1 mark that has 2 lines. So I have seen 911 pulleys with Z1 and 1 line.
The question de jour is which of the 2 lines at Z1 is TDC? Or are the 2 lines giving me the dwell of where TDC is and if so, where should I put them in relation to the case to set cam timing and do valve adjustments. it looks like " Z | | 1" It is a 2.4 Somebody knows this answer. |
   |
 
|
  |
Replies
| IronHillRestorations |
Mar 16 2023, 03:06 PM
Post
#2
|
|
I. I. R. C. Group: Members Posts: 6,922 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None
|
To add confusion the 2.4 and 2.7’s crank is indexed differently than the 2.0 and 2.2’s.
You can use a 2.0 (same as 914-6) flywheel on 2.0-2.7 and it will bolt up, but with 2.4 and 2.7 the timing marks on the flywheel will be off. I always re-mark Z1, 35*, 120*, and 240*. With a 6 it’s much easier to set the timing and adjust the valves using the marks on the flywheel. |
|
|
|
Posts in this topic
Robarabian Question for Six Engine People Mar 15 2023, 08:48 PM
Robarabian I may have found the answer looking at 50 differen... Mar 15 2023, 08:57 PM targa72e That is correct . 911 of that vintage had vacuum r... Mar 15 2023, 10:33 PM Krieger I think the 5° BTDC is the timing mark at idle. I... Mar 15 2023, 10:33 PM ClayPerrine A suggestion for setting the cam timing.
Only pu... Mar 16 2023, 05:28 AM gereed75 I would emphasize one of Clays comments -put a dia... Mar 16 2023, 09:57 AM 930cabman I would double check with a dial indicator Mar 16 2023, 11:58 AM
Robarabian I was wondering about that. I installed a new flyw... Mar 16 2023, 06:45 PM Robarabian So my pulley actually has the Z1 mark and the seco... Mar 16 2023, 06:43 PM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 14th March 2026 - 01:58 AM |
Invision Power Board
v9.1.4 © 2026 IPS, Inc.