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Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Interior Tech Forum -> Another what is this thing question in my 70 Bon. engine bay ?
Post Info TOPIC: Another what is this thing question in my 70 Bon. engine bay ?
pontorquer


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Another what is this thing question in my 70 Bon. engine bay ?
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 Hi evryone,

  I was wondering what is this or the purpose of that " black drum like thing " on the firewall, beside the underhood light behind the dual snorkel air cleaner ? Thanks

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67Poncho


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/download.spark?ID=362325&forumID=118110
 If I have it correctly, that should be the vacuum resovoire? For vacuum controlled items such as the a/c-heater and cruise, if need be. It should have a small hose going to it from a vac source at the intake manifold.
 (Thanks to Mark for showing me how to enlarge pictures, I feel important!!)

-- Edited by 67Poncho at 11:58, 2008-11-09

-- Edited by 67Poncho at 11:59, 2008-11-09

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2drpost


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vacuum reservior, stores vacuum for instances of low engine vacuum(wot/climbing hills), keeps the hvac from defaulting to defrost mode when vac is low.

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pontorquer


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Thanks guys !

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cdnpont


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How does it store vaccume?

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 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
4SPEED427


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It likely has 2 hoses going to it, with one of them having a one way valve so that when the engine vacuum drops it doesn't lose the vacuum but keeps it supplied to the source as mentioned (defroster, cruise or whatever.)

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
cdnpont


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 Is it a bladder, a spring?

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 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
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pontorquer


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I removed it this afternoon and only one hose used to got to it, it has been disabled for some time ?

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4SPEED427


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I believe it is still a reserve for vacuum for heater, etc. but I forget how they do it with one hose on it.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
Bill Collier


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It's a vacuum reserve cannister that supplies vacuum to ac and heater.

when engine is under load with little or no vacuum.smile



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Bill Collier
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It might only need one line. It stores just store vacuum like as air compressor reservoir stores pressure.

It could also have a check valve in it to prevent it losing vacuum when manifold vacuum drops. In that case, I'd expect it have one line connected to manifold (with a check valve in it) and a second line going to whatever system requires the vacuum.

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