I'll be installing an SSBC vacuum pump this spring.

Two of the vibration isolators are boogered up. Has anyone seen these for sale anywhere? I emailed SSBC and they said they will look for some in the warehouse, but haven't heard back from them yet. What about using the isolators for the airconditioning condensor (rubber mounts on radiator support for condenser)? Are these still available from GM?

Also where have you guys mounted your vacuum pumps? I have no inner fenders and am thinking on hanging it on a bracket off the Em. brake studs by the booster. Any other ideas on mounting it?

Thanks

Ill be havig to run one too. Would like to hear some responses to this one.

I have mine mounted on the passenger side firewall. I know someone who mounted it underneath his inner fender to try to decrease the noise......it didn't help. Those things are incredibly noisy, vibration mounts or not!

My son and I had a bracket made(as we don't have the expertise to weld) and mounted it under the master cylinder using the bolts that hold the master cylinder to the booster. I used shock absober rubber but to be honest there is still a lot of vibration though the steering column and yes they are noisy. I am going to try and come up with a better vibration absorbent mounting system this spring. In my research it was mentioned to make sure you have it turned down so any moisture could leave via the weep holes. I'm considering getting a hydroboost set up from an astro van if I can't get the noise and vibration levels down. Pete

I make these things for my company all the time. Shoot me an e-mail w/ your address and I will send ya some. Other wise if you have a Grainger in your area they stock them too. I run my vac pump in the truck as it is loud and pretty annoying under the hood. I installed a plate w/ isolators the the pump on isolators and it works pretty good.

Pumps in the front, ARB air locker in the rear of the picture on the same plate.

:beers:

Their on the way!

Mounting anything to the brake master cylinder area of the dash is asking for noise transmission into the driver compartment - Big Time! The dash panel is one big sounding board. Then you have the instrument cluster structure that is rigidly attached to that brake system area and also mounts the steering column. Even the hydroboost unit when attached to that structure will transmit a lot of hydraulic noise.

You need to mount your electric vacuum pump as far away from the driver compartment as you can to reduce the noise.

JIML82

Robert
They are perfect, thankyou!:thumbsup:

Jim, thanks for the advice on mounting.

Mounting anything to the brake master cylinder area of the dash is asking for noise transmission into the driver compartment - Big Time! The dash panel is one big sounding board. Then you have the instrument cluster structure that is rigidly attached to that brake system area and also mounts the steering column. Even the hydroboost unit when attached to that structure will transmit a lot of hydraulic noise.

You need to mount your electric vacuum pump as far away from the driver compartment as you can to reduce the noise.

JIML82

Man are you right about this one. Thought I was keeping the engine compartment clean looking. Kept it clean looking but the noise transmission is aggrevating. Needless to say a move is on yhe way this spring. Pete

Jim's comments are right about the direction I was thinking. Sheetmetal can make a very effective speaker to transmit and even amplify noise.

The other factor to consider here is inertia. The reason you get noise is because something is moving at some frequency, in this case the vacuum pump. Now if you mount it to something with equal or less mass that motion can be transferred straight across. Especially if the mounting is about the same stiffness as where things are mounted.

But is you mount it to something with a lot more mass, the amount of broadcast movement will be much less. For example how much could a 10 lb vacuum pump move a 500 lb engine? Not very much, in this example the engine is going to move the vacuum pump. Given this principle I would be thinking frame mounting.

Although the double isolation mount shown above is not bad either. But it is working on two principles: first it doubles the amount of rubber in the mount making it softer by half over a single isolation mount, and second it increases the vibration mass to reduce/offset the vibrations. That second pump on the plate increases the plate mass as a damper. It would be even quieter with an isolation box around the pumps on top, but then you have to manage heat build up.

I mounted mine on the front driver's fenderwell. However, no matter what, it could not keep up. Converting to Hydroboost to be done with it.