hydro-boost suggestions

[Longroof79]

565BB,
This vacuum pump runs in conjunction with the existing vacuum assisted brake booster? In other words it functions like a small pump, and supplies vacuum to the booster.
Interesting....

 

[565bbchevy]

565BB,
This vacuum pump runs in conjunction with the existing vacuum assisted brake booster? In other words it functions like a small pump, and supplies vacuum to the booster.
Interesting....

That is correct, it would be the same as using one of those very expensive electric vacuum pumps but does not require any source for vacuum (or wiring) like the electric.
You figure this is an OEM designed pump made for brake vacuum assist for diesel trucks so I would have to imagine they get a couple hundred thousand miles out of these units.

 

[Longroof79]

That is correct, it would be the same as using one of those very expensive electric vacuum pumps but does not require any source for vacuum (or wiring) like the electric.
You figure this is an OEM designed pump made for brake vacuum assist for diesel trucks so I would have to imagine they get a couple hundred thousand miles out of these units.

Thank you for sharing and explaining how the unit functions. I'm wondering how difficult it would be, or what it would entail to mount it on a typical SBC. I do have A/C, and I'm thinking the compressor would obstruct the pump from fitting.
I do like the principal of how it operates.

 

[565bbchevy]

I don't have AC but I used the second groove on my power steering pump pulley which is for a BBC.
Another option if no pulley location or spot to mount the pump is available would be using a crankshaft driven v- belt pulley with a mandrel and mount the pump down low out of the way and out of sight, of coarse this would also add to the cost of the set up.

 

[Longroof79]

That's a good suggestion about mounting the assist pump down low and adding an additional pulley to the crank. It looks like any way you look at it, it's going to entail some mods.
I may end up having to rethink this whole situation. In my case it's not a dire need. In your case, it was a matter of necessity.

 

[Longroof79]

That's a good suggestion about mounting the assist pump down low and adding an additional pulley to the crank. It looks like any way you look at it, it's going to entail some mods.
I may end up having to rethink this whole deal. In my case it's not a necessity..in your case it was absolutely necessary.

 

[Texas82GP]

Another difference on the factory hydroboost cars is that the power steering pump has two nipples on the reservoir for return lines. On the hydroboost boost setup the pressure hose from the pump goes to the hydroboost unit. Then a pressure hose goes from the hydroboost unit to the power steering gearbox. Then you have a return line from the hydroboost unit to the pump and a separate return line from the gearbox to the pump. When I bought my car it had a regular power steering pump with only one nipple on the reservoir. The previous owner had the return lines spliced together with a hokey contraption of brass fittings and hose clamps. It leaked like a sieve. Other than the reservoir I'm not aware of any difference in the pumps but I could be wrong. I need to research that.

 

[565bbchevy]

That's a good suggestion about mounting the assist pump down low and adding an additional pulley to the crank. It looks like any way you look at it, it's going to entail some mods.
I may end up having to rethink this whole deal. In my case it's not a necessity..in your case it was absolutely necessary.

Absolutely necessary for me but on my engine I had a spot that seemed destined for it with an open pulley groove and room to mount it only requiring me to fab up mounting brackets.

 

[Texas82GP]

I can see the benefit of a belt driven vacuum pump to supply vacuum to the vacuum brake booster when you have so much cam that the engine isn't capable of supplying enough manifold vacuum for the booster to work properly. I'd argue though that the pedal feel of a sufficiently supplied vacuum booster is different than the pedal feel of a properly configured hydroboost setup. I find hydroboost to have a firmer, more positive feel. For example, my brother has a 2002 1/2 ton Sierra with a vacuum booster and factory rear disc brakes. I've always felt his brake pedal feels mushy, even when the truck was brand new. In contrast, we have a 2002 3/4 ton Silverado at work with hydroboost and factory rear disc brakes. It has 200,000 miles on it and I find the pedal feel to be excellent. If you don't have a big cam then the main benefit of the hydroboost in my mind is improved pedal feel. After I drive that 3/4 ton and get in my 2008 Sierra with vacuum booster and rear drum brakes, I find myself wishing it had hydroboost.

 

[-83MONTESS-]

That is correct, it would be the same as using one of those very expensive electric vacuum pumps but does not require any source for vacuum (or wiring) like the electric.
You figure this is an OEM designed pump made for brake vacuum assist for diesel trucks so I would have to imagine they get a couple hundred thousand miles out of these units.

Quick random question.....would one of those vacuum pumps work the same way the aftermarket ones do for piston ring sealing? I know you would have to plumb it up to the valve covers but do u think it would work the same?