Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > 911 Engine Rebuilding Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered
 
Join Date: Jul 2010
Location: New Jersey
Posts: 7,171
Garage
Factory 3.1 SC-L cam timing help

I am wondering if someone can help me understand the cam timing on this letter for the motor I am currently working on.

In hindsight I probably should have checked it before disassembled, but both chain tensioners were collapsed and I figured it may have been thrown off

Here is the letter from the dealer/factory


Old 08-11-2020, 04:00 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered
 
Join Date: Jul 2010
Location: New Jersey
Posts: 7,171
Garage
Old 08-11-2020, 04:01 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
lake wales fla
 
Join Date: Feb 2017
Posts: 1,208
That technical bulletin came from my archives and i posted it in Dec. 2018 in response to questions from Pelican member Steve G about the factory 3.1 kit offered thru Porsche as an upgrade to complaining customers of the disappointing power levels at the time.

I am not sure what you are trying to understand as the timing figures are pretty self explanatory. The timing spec range is 0.9- 1.1 mm overlap @ TDC with a optimal setting of 1 mm. The 3.0 carrera, all SC's and all 3.2 carreras have the same cam specs and can be timed as far retarded as 0.9 and advanced to 1.8 mm or more depending on other engine factors.

You can time your cams anywhere in that range depending on what you are looking for (low end torque advance them - High rpm H.P retard them) Or somewhere in the middle (1.4) for a compromise.

Richard
Old 08-11-2020, 04:46 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered
 
Join Date: Jul 2010
Location: New Jersey
Posts: 7,171
Garage
That’s all I was trying to verify, is that it was the “same” cam timing as usual


Quote:
Originally Posted by porschyard View Post
That technical bulletin came from my archives and i posted it in Dec. 2018 in response to questions from Pelican member Steve G about the factory 3.1 kit offered thru Porsche as an upgrade to complaining customers of the disappointing power levels at the time.

I am not sure what you are trying to understand as the timing figures are pretty self explanatory. The timing spec range is 0.9- 1.1 mm overlap @ TDC with a optimal setting of 1 mm. The 3.0 carrera, all SC's and all 3.2 carreras have the same cam specs and can be timed as far retarded as 0.9 and advanced to 1.8 mm or more depending on other engine factors.

You can time your cams anywhere in that range depending on what you are looking for (low end torque advance them - High rpm H.P retard them) Or somewhere in the middle (1.4) for a compromise.

Richard
Old 08-11-2020, 06:47 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
lake wales fla
 
Join Date: Feb 2017
Posts: 1,208
Quote:
Originally Posted by jimtweet View Post
That’s all I was trying to verify, is that it was the “same” cam timing as usual
Yes, Procedurally the same as all other 911 cam timing.

Richard

Old 08-11-2020, 11:33 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Reply


 


All times are GMT -8. The time now is 08:29 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.