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Hydralic -VS- Bi-metal plate tensioners

 
Old 05-20-2008, 11:50 PM
  #31  
ROG100
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The Porkensioner with the bracket for the air pump is $189 and without $149.
The audie parts are $162.25 and the tensioner gasket is $7.94.
Add to that a TB & WP and set of new bolts - 78 to 86 = $148 + $125 WP core charge.
87 to 95 = $163 + $125 WP Core charge.
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Old 05-21-2008, 12:58 AM
  #32  
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Originally Posted by David R. Hendrickson View Post
even in stock trim, the Audi V6's have the crank idlers.
The Audi 30V has a idler (C), but it is used to make the belt layout more compact.

The 928's accessory pullies are not true idlers, as they don't normally contact the belt. They are, for lack of a word, low-tension-guide pulleys. I haven't seen any other engine that has these, except a lawnmower!

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Old 05-21-2008, 01:16 AM
  #33  
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Porken wrote:

"If by 'hydraulic', you mean a sprung/damped tensioner, like on the Porsche 944/968, they are self adjusting. They automatically reset up or down to the ideal range of tension. Unfortunately, when they designed the 968 tensioner system, they didn't bother to redesign the tensioner for the GTS."

Umm, I am prepared to be corrected, but the "self adjusting tensioner" on the 944S2 does NOT automatically maintain tension during engine operation. It has a spring that will set the tension when the lock nut is loosened, but the WSM instructs that the lock nut be tightened after the spring sets the "right" tension.

Apparently it was implemented to no longer require the P9201 tool to set the tension.
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Old 05-21-2008, 01:31 AM
  #34  
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Originally Posted by sendarius View Post
Porken wrote:

"If by 'hydraulic', you mean a sprung/damped tensioner, like on the Porsche 944/968, they are self adjusting. They automatically reset up or down to the ideal range of tension. Unfortunately, when they designed the 968 tensioner system, they didn't bother to redesign the tensioner for the GTS."

Umm, I am prepared to be corrected, but the "self adjusting tensioner" on the 944S2 does NOT automatically maintain tension during engine operation. It has a spring that will set the tension when the lock nut is loosened, but the WSM instructs that the lock nut be tightened after the spring sets the "right" tension.

Apparently it was implemented to no longer require the P9201 tool to set the tension.
I'm not sure when the hydraulic tensioner went into the 944, but it's part # 944-105-172-03. I'm sure it is on all 968's. It may be on newer 944S2's as well. The spring tensioner was on 944's in the late 80's (944-105-067-14 & 16), and is no better than the 928's stock tensioner.

Dan
'91 928GT S/C
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Old 05-21-2008, 01:36 AM
  #35  
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I should have said 968. For some reason, I thought the 944 was still available along with the 968, early on.

Here's the 968 engine with it's hydraulic tensioner - 944 105 172 03

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Old 05-21-2008, 06:03 AM
  #36  
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Originally Posted by PorKen View Post
The Audi 30V has a idler (C), but it is used to make the belt layout more compact.
you are correct. for some reason i was picturing TDI idlers in my head as they are roughly the same size as the 928 crank idlers...
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Old 05-21-2008, 08:39 PM
  #37  
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Lower belt guide pulley:
Yes I know thanks; I was wondering if/when someone would catch that

That photo was just after I put on the belt and as I had cleaned it (and it is in good shape)
I put it on as I read it could go either way. I removed it afterwards as the pulley assembly seamed to rattle on the two posts and I did not want any unnecessary noise coming out of the engine. So in the final assembly it’s on the bench.

I have moved on to another area…
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