Steering pump pressure
Discussion
That Daddy said:
eff eff said:
Anybody know what the steering pump output pressure on a Griff 500 is, and does the rack get full pressure or is it regulated?
Dont know,why? yes it as a relief valve fitted
stevieturbo said:
If the rack is intended to take 1000+psi....I dont think a couple of hundred either way will be a big problem.
Id say most use similar pressures. Ive had a few different racks and pumps on my car, and never had any problems.
True StevieId say most use similar pressures. Ive had a few different racks and pumps on my car, and never had any problems.
,i know various people who have done just this and never had even overlight or over heavy steering because of incompatible hardware,let alone blown seals in the rack,i can understand the OP,s concern though,try speaking to a power steering specialist they may help.Edited by That Daddy on Saturday 2nd February 21:03
I think that if you put a dead end against any of the mechanical pumps....they would create enough pressure to blow something up.
But IMO, I think its the rack itself that governs its own operating pressures. The pump is irrelevant, unless it cant create enough.
Any pumps Ive used...are just that. Pumps. No obvious pressure control on them at all. Its all in the rack.
But IMO, I think its the rack itself that governs its own operating pressures. The pump is irrelevant, unless it cant create enough.
Any pumps Ive used...are just that. Pumps. No obvious pressure control on them at all. Its all in the rack.
stevieturbo said:
I think that if you put a dead end against any of the mechanical pumps....they would create enough pressure to blow something up.
But IMO, I think its the rack itself that governs its own operating pressures. The pump is irrelevant, unless it cant create enough.
Any pumps Ive used...are just that. Pumps. No obvious pressure control on them at all. Its all in the rack.
As a general rule of thumb most pumps will have a full flow relief valve so that if the pump is 'dead-headed' (i.e. end of rack) it won't blow the pump. But IMO, I think its the rack itself that governs its own operating pressures. The pump is irrelevant, unless it cant create enough.
Any pumps Ive used...are just that. Pumps. No obvious pressure control on them at all. Its all in the rack.
I would have thought it would have been more pratical to transfer the pump from the old engine to the new one, while it may be a minor ball ache initially at least you can have confidence that its paired with your rack correctly. (Ensure it spins at the same speed for given engine rpm)
As far as I know it's just a standard Landrover pump and the system pressure is about 750 - 1000 psi. As has been said, it's not really the absolute pressure that gives the assistance but a pressure differential across the rack. In the straight ahead position, there is full pump pressure in both sides of the rackso there is no "assistance". As soon as the wheel is turned, a torsion bar in the valve block on the rack twists by an amount proportional to the torque on the steering wheel. This lets some pressure out of one side of the rack while allowing more pressure to build up on the other side, giving a "push" one way or the other to the rack bar. Reducin gth epump pressure does nothing because the pressure "difference" is still the same. If, however, they pressure is reduced too much, the flow to the rack can be reduced when demand for flow is high (like a swerve) and then the steering will go momentarily "heavy" until the fluid moves into the half of the rack that is lengthening and builds up enough pressure to provide assistanec again.
I'm also fairly certain that there is a relief valve in the pump otherwise it would blow up when you were driving in a straight line. It only really needs to "do" anything when you turn the wheel.
I'm also fairly certain that there is a relief valve in the pump otherwise it would blow up when you were driving in a straight line. It only really needs to "do" anything when you turn the wheel.
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