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pgtips
Samba Member
Joined: July 23, 2009
Posts: 767
Location: essex
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 Posted: Tue Jan 11, 2011 11:04 am Post subject: retro fit a decel valve |
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Hi,
I've got a 75 fi auto, didn't come with decel valve as standard. I have a 'spare' fi setup from a later model bus (unknown what year) and I have a decel valve in this box of bits.
While I'm rebuilding I'm just wondering if it would be worth fitting the decel valve into the plumbing.
I am concerned it might have a knock on effect elsewhere, i.e is the FI set up to work better on my bus without it, is there anything else I should consider. Looking at posts on this they seem quite bullet proof/low failure instances so I'm not sweating on adding another thing that can go wrong later.
It appears to be a passive device so I am wondering, VW wouldn't have started to fit them unless they felt it was a good idea. Will it help if I do?
thanks
Kevin |
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germansupplyscott
Samba Member
Joined: May 22, 2004
Posts: 6316
Location: toronto
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| Posted: Tue Jan 11, 2011 11:22 am Post subject: Re: retro fit a decel valve |
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| pgtips wrote: |
Hi,
I've got a 75 fi auto, didn't come with decel valve as standard. |
are you sure? all injected type 4 bus have a decel valve except it was deleted in the automatic vanagon aircooled.
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SL |
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mattcuddy
Samba Member
Joined: October 22, 2003
Posts: 2033
Location: Philly, PA
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| Posted: Tue Jan 11, 2011 11:27 am Post subject: Re: retro fit a decel valve |
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| pgtips wrote: |
Hi,I have a 'spare' fi setup from a later model bus (unknown what year) and I have a decel valve in this box of bits.
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Don;t know what your spares are, but remember that the decel valve for an auto bus is different from a manual bus. |
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Westfabulous
Samba Member
Joined: January 07, 2007
Posts: 4207
Location: The tropic of Canada, dodging the giant flying moose of Surrey!
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| Posted: Tue Jan 11, 2011 11:47 am Post subject: |
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I too have an automatic (79), and this is a picture of my engine. You should have something like this, as opposed to the round diaphragm that we are all so familiar with. Circled in red; double click to enlarge:
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germansupplyscott
Samba Member
Joined: May 22, 2004
Posts: 6316
Location: toronto
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| Posted: Tue Jan 11, 2011 12:00 pm Post subject: |
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| Westfabulous wrote: |
| You should have something like this |
'75 auto uses an completely different decel valve that that one, it's electric.
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SL |
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busdaddy
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Joined: February 12, 2004
Posts: 45657
Location: Surrey B.C. Canada, Land of the giant flying moose!
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ChinaRider022474
Samba Member
Joined: September 07, 2008
Posts: 63
Location: SW FL
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| Posted: Tue Jan 11, 2011 1:01 pm Post subject: |
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What's even more amazing are the prices those auto decel valves (on the left in those pics) command these days. They's NLA for looong time. I grabbed one to rathole. If you have a late auto bus, you need to do the same.
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pgtips
Samba Member
Joined: July 23, 2009
Posts: 767
Location: essex
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| Posted: Tue Jan 11, 2011 4:41 pm Post subject: |
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well thats made me double take.
I've got the one on the rhs.
Per BD pic I clearly do have a decel valve but bentley said I didn't (FI section, 10 I think, page 24).
So after reading it didn't I assumed it was the aux air regulator (per bentley also section 10 page 12)
So if that is decel then I do have one. It connects into the air filter S housing.
Something else I have learnt today.
Thank you to all. |
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 45657
Location: Surrey B.C. Canada, Land of the giant flying moose!
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| Posted: Tue Jan 11, 2011 4:47 pm Post subject: |
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Congratulations, the AAR is the dotty thing that #50 connects to in the diagram BTW 
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germansupplyscott
Samba Member
Joined: May 22, 2004
Posts: 6316
Location: toronto
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| Posted: Tue Jan 11, 2011 5:38 pm Post subject: |
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| pgtips wrote: |
| Per BD pic I clearly do have a decel valve but bentley said I didn't |
i told you you had one about a week ago in your other thread...
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SL |
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pgtips
Samba Member
Joined: July 23, 2009
Posts: 767
Location: essex
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| Posted: Wed Jan 12, 2011 7:42 am Post subject: |
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| germansupplyscott wrote: |
i told you you had one about a week ago in your other thread... |
Yes you did, I hold my hands up,
I relied on Bentley.
Bentley was wrong. Thanks for your patience though, I've learnt quite a lot this week about my bus. |
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raygreenwood
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Joined: November 24, 2008
Posts: 18525
Location: Oklahoma City
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| Posted: Wed Jan 12, 2011 3:16 pm Post subject: |
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| In almost all cases, you can use the manual (vacuum decel valve) in place of the electric one. Its just a little trickier to adjust and plumb. Ray |
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