Thanks Mark, I should have looked harder in the first place as hadn't realised we had these. Must admit after viewing them I would have gone straight out and bought a Syncho if I hadn't already got one. Thanks for pointing me in the right direction.
Trust all is well with you and you family.
Cheers
Roger --- On Sun, 5/7/09, Mark Kofahl <markkofahl@gmail.com> wrote:
From: Mark Kofahl <markkofahl@gmail.com> Subject: Re: [Syncro_T3_Australia] Syncro's Viscous Coupling System Description To: Syncro_T3_Australia@yahoogroups.com Received: Sunday, 5 July, 2009, 8:16 PM
Hi Roger It is actually on our Syncro Website ( www.syncro.com. au) under videos. There are 3 parts. The first is here: http://www.syncro. com.au/Volkswage n-Syncro- Introduction- VideoEnjoy! Mark.
On Sat, Jul 4, 2009 at 1:38 AM, Roger Bell <bellrmit@yahoo. com.au> wrote:
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-
Hi Folks,
- I think the following U.S, posting could interest many of our members.Don't suppose anyone is aware of this video and/or similar ones being posted on the Net for viewing?
- Cheers
- Roger
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- Syncro's Viscous Coupling System Description
-
Thu Jul 2, 2009 9:14 am (PDT)
Syncronuts,
I've just re-watched an old video from VW's marketing department made in 1987. I believe it was intended to show to potential customer in dealer showrooms. I've transcribed an excerpt of the video here that describes the Syncro's viscous coupling system below. Please note that VW never said the Syncro was for off-roading and the context of this description is for improved performance in on-road conditions, especially in wet/icy conditions.
============ ========= ========= ========= ========= ========= ========= == VOLKSWAGEN COMMUNICATION NETWORK, VW VANAGON VIDEO - 1987
"Syncro is not just four-wheel drive, it's better. Conventional four-wheel drive systems commonly used today have several disadvantages. - They're designed for part-time use. - The driver must switch them on. - They require a heavy and bulky transfer
case. - They make steering difficult since the front and rear wheels can't turn at their own normal speed during cornering. This can also cause tire scrubbing, increased tire wear, and reduced traction.
"The Vanagon Syncro's system avoids these by replacing the bulky transfer case with a compact, lightweight viscous coupling which sends power to the front wheels only when necessary on a need-to-have basis. The viscous coupling uses two sets of 24 plates surrounded by a special silicon fluid. One set is attached to the rear wheels, the other to the front. If the rear wheels lose traction and begin slipping, the attached plates begin to spin. As they spin, they heat the silicon fluid which quickly thickens to lock the plates together sending power to the front wheels. This entire process occurs automatically within one tenth of a second providing traction at all four wheels instantly without the
need to shift.
"In addition, the Syncro system reduces the tire scrubbing associated with cornering and four-wheel drive. Syncro allows each wheel to turn at its own speed. All this means you get better performance under poor conditions when you need it most." ============ ========= ========= ========= ========= ========= ========= =====
While this is a obviously a marketing message, not an engineering document, I believe it provides a succinct, generally accurate description of the Syncro's all-wheel drive system.
The video's "marketing" bent and associated "puffing" can be noted elsewhere in the video where they describe the 2.1L engine as "strong" and "robust". I'd say that's pretty optimistic, but when the context was that they'd recently upgraded from the less powerful 1.9L engine, the 2.1L is indeed stronger. Another place where the video's script is not so accurate is "providing
traction at all four wheels". Technically, no drive system can provide traction as that's a result of the friction between the tire and the road surface. It would have been more accurate to state that the Syncro system can "provide power to all four wheels".
This is not intended to provide any sort of authoritative description of how the viscous coupling system works, but it does show how VW described its operation.
Regards, Jim Davis
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