Vacuum canister

[Normspeed]

Got it all installed, thanks again to Old daddy for the vac cans. In these pics the valve adjustment access panel is still out of the fenderwell but when it's reinstalled it will completely hide the canister, with two grommeted holes for the vacuum lines. Clearance with the right front tire at full right turn is tight since the car is lowered a little but so far no rubbing. Pay no attention to the 4" dryer hose. My car is a test platform for many classified high level shadetree prototypes.

[Don Coatney]

Norm;

I notice your nice dual exhaust pipes funnel into one collector. I assume there is a reason?

[Young Ed]

I'm curious what the size of these vacuum cans is? I'd like to hide one in the header panel of my truck. Its got seperate wiper motors for each side and I think it would work ok to have it up there between them.

[bob westphal]

I made a vacuum can from an old quart grapefruit juice can but both ports are on the same end. Is there a reason that you put one on each end of the can?

[Reg Evans]

My 38 Dodge coupe has one mounted real proud right on the firewall. It's about 8" tall by 2 1/4 in diameter. Looks stock to me. Could it be or is it an after market thing?

[Normspeed]

Don, the only reason was for the sound. I heard a similar setup on a Jimmy six and is sounded real good. A local shop put together the system for me. The pipes go to a collector, then a single 2 1/4" all the way back with a single Flowmaster. Side exit so the square back of the wagon doesn't suck in a bunch of fumes. Great sound. Flowmasters supposedly also have a scavenging effect on exhaust flow.

Dodge PU1946, I used a canister about the size of a quart grapefruit juice can. The mounting bracket was already on it. Old Daddy shipped me 3, and two are shorter. Might work for your application. PM me if you'd like them, Old Daddy says he doesn't need them back.

Bob, this canister already had one factory made hole in the center of one end and due to ridges in the ends I couldn't put 2 holes side by side and still get a good seal with the grommets so I drilled both ends.

[Young Ed]

Bob if you think it will fit through this opening I'd love to have one. If I'm pictureing a quart correctly I think it should fit.

[Normspeed]

You mean the opening above the sunvisor?

[Young Ed]

Yup. To the right of that is a big open space between the 2 wiper motors.

[Normspeed]

The two canisters I have leftover are the same diameter as the larger one, but they're shorter. I'll measure them tonight and post the domensions.

[TodFitch]

Yup. To the right of that is a big open space between the 2 wiper motors.

Thanks for the idea. That would be a good place to hide a bigger vacuum reservoir on my car too. I had a small one crammed under the dash but did not like it there for a couple of reasons. I think I can make up something using PVC tubing, since it will be hidden behind the header panel appearance is not an issue.

[Young Ed]

If it turns out Norms extra won't fit I'll have to try your PVC idea.

[claybill]

i know you can compress air..but a vacuum??? please explain.

also , please post if you see an improvement in your vacuum accessories..

thanks, claybill

[claybill]

also...if it works..is there any difference in the size/shape of the storage unit.

ex....a 12 in long x 4" tube ..... or 8"X8" FAT CAN...or a 24" x 2" pvc...

how much can be stored...? or is it depleted(fill with air) when you shut down the engine, or does the vacuum remain until needed by the wipers etc etc...

clAYBILL

[T.Tom Meshingear]

A lot of German cars use these plastic vacuum reservoirs.

The two pictured are from a Mercedes and I am going to hide one somewhere in my car either in the kick panel or behind the rear seat. They are fairly flat unlike the cans and so will be easier to hide.

[TodFitch]

A canister holding vacuum is simply a container with less air pressure in it that the atmosphere around it.

The concept is that you have a one way check valve in the line from the manifold to the canister and then run the vacuum driven accessories off the canister. In my case that is only the windshield wiper.

When the manifold vacuum is high air will drawn out of the canister. When the manifold vacuum is low (heavy acceleration or pulling a grade) the canister will retain the vacuum and allow the accessory to operator "normally" (at least for a little while).

The goal, at least as far as I am concerned, is to keep the wiper running when I accelerate from a stop light or, on the very rare occasion, pass someone.

Detroit "solved" this problem with double acting fuel pumps where one side of the pump was actually a vacuum pump that was connected in series to the line from the manifold. I don't know if there is a double acting pump that would fit my 1933 and even if I could find one it would not look stock.

[greg g]

VW have them also but a bit smaller, they usually mount on the underside of the hood near the fire wall. Of not for you folks with space issues, Jeep Cherokee's hav one about the size of a tennisball behind the front bumper on the pass side. Think it may be for the cruise controll motor.

You are not compressing anything just a space for the manifold to pull a reserve vacuum. Take a two liter soda bottle and see how much vacuum you can generate by sucking on it till the air is gone. Same deal with the canisters but they are stouter and don't collapse. A canaster of this type will provide about a dozen or so good swipes of the wipers, evens out the operation at driving speed and makes up for changing throttle positions keeping the wipers at a steady speed, I have one of the smaller VW unite up under my dash. I try ot avoid driving in the rain, but its there if I need it.

[Normspeed]

Here are the two smaller ones. They are 4" across, 3 1/2" high, make it 4" high with the brackets.

[Normspeed]

I drilled my access panel for rubber grommets where the 2 vac hoses will pass through it. Shot one more coat of satin black. It's ready to go in after the paint really cures, maybe next week sometime. The vac canister will be behind this, in the fenderwell.

[billwillard]

Use RANX You dont even need wipers.

BILL;)

[Don Coatney]

I have had a vacuum reservoir mounted on my firewall for a couple of years now. I can get 4-5 swipes several minutes after I stop the engine. It helps but it is not like a new car with electric wipers. One of the worst driving experiences I have had with my P-15 was driving through Smashville in a heavy rain after dark. This was a white knuckle drive all the way home.

[David Maxwell]

It was tucked away in my garage. The thing is huge! Looks more like a small gas tank than a vacuum tank. I would guess that it would hold about 2.5 to 3 gallons if were a gas tank. Can't remember where or when I picked it up. Anyone know what such a tank would have been made for?

[Normspeed]

Here is the setup with the valve inspection panel installed. No tire rubbing problems even at full right lock. I wrapped the canister with some of that non slip rubber sheet so it won't rattle against the inspection panel.

This one isn't for wipers, mine are electric. This one serves a higher function, it powers my vacuum wolf whistle.

[Don Coatney]

David;

If it is indeed a vacuum tank it was probably made to store very little of anything.

[Guest jtw3749c]

I made myself a remote electric wiper. Like Don, I didn't care much for the rain storms that I've been in with my 37. Works pretty good, even if I do say so my self.