|
|
|
|
| Author |
|
|
Registered
|
Idler arms... Huh?
So I was reading through the Carrera Chain Tensioner upgrade page on Pelican's website and I was just wondering what exactly the difference is between the original idler arms on a 71T and the "newer style" arms. Is there much of a difference? Performance? Reliability? How intensive is the swap of the arms?
|
||
10-22-2003, 01:50 PM
|
|
|
Registered
|
The newer ones have a larger bushing area that prevents any sort of binding.
__________________
Tim 1973 911T 2005 VW GTI "Dave, hit the brakes, but don't look like your htting the brakes...what? I DON'T KNOW, BRAKE CASUAL!!!" dtw's thoughts after nearly rear ending a SHP officer |
||
|
10-22-2003, 01:53 PM
|
|
|
Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,310
|
Those older-generation idler arms are thought by many to be the real culprit in tensioner failures. That is, the additional pressure put on tensioners in trying to aply tension to idler arms that are tending to bind...is the cause of tensioner failures. So yes, current wisdom says that the newer idler arms are as important as the pressure-fed tensioners.
__________________
Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
||
|
10-22-2003, 01:58 PM
|
|
|
Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
|
There are some that believe the updated idler arms with two bushings and 10 mm additional width bearing surface, which were introduced in the mid-1980 production year ... solved the tensioner failure problem!
You could, in fact, have 10 mm milled off the mounting arm of your existing tensioners, and install just the two updated idler arms ... and achieve the same reliability benefits the 1980 - 83 models enjoyed! They were, afterall, some of the most reliable production models that ever came out of Stuttgart! I have always said that those that 'push' the tensioner update and sell the $6 spacers ... in order to continue using the original idler arms -- are doing customers a disservice!!!
__________________
Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' Last edited by Early_S_Man; 10-22-2003 at 02:19 PM.. |
||
|
10-22-2003, 02:15 PM
|
|
|
Registered
|
Woah, woah woah. Hold on there Early... You mean to tell me that by milling 10mm off my tensioners I can bypass the carrera upgrade if I toss on the two new idler arms? It's almost too easy...
__________________
Brian Hensarling '89 C4: Gran Prix White brianhensarling@hotmail.com |
||
|
10-22-2003, 02:18 PM
|
|
|
Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
|
Brian,
Yes, if you install or already have the safety collars on your old-style tensioners ... there isn't any need to automatically 'update' the tensioners as an insurance policy -- like many people do! With the safety collars in place, the isn't any danger of valves and pistons colliding when the tensioners fail. You will hear additional noise, and will have to adress the collapsed tensioner at that time, but the car won't be driveable until you replace or rebuild the offending tensioner... Your choice ...
__________________
Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
||
|
10-22-2003, 02:28 PM
|
|
|
|
Registered
Join Date: Nov 2002
Location: Redmond, WA
Posts: 159
|
Are the updated chain sprocket supports the part name for the updated idler arms?
These are what I'm referring to: Part # PEL-REBKT-17 http://www.pelicanparts.com/cgi-bin/autocat/load_page.cgi?page_number=2&bookmark=7&model=911M&currsection=enginR And the Collars for those interested are Pelican Part # A-105-049-TG OEM # 901105049TG Also what's the deal with this kit? Carrera Pressure Fed Chain Tensioner Kit Pelican Part # H-105-911-99 Oem part #93010591199 Price $379.00 Edit: I'm asking because it's $60 cheaper than the other one listed.
__________________
'70 911T Signal Orange Last edited by project911; 10-22-2003 at 07:18 PM.. |
||
|
10-22-2003, 03:47 PM
|
|
1989 Porsche 911 (964) 3.6L
1973 Porsche 911 2.4 MFI
