Hendrik Posted January 3, 2008 Share Posted January 3, 2008 I run full hydraulic steering with the normal pas pump, but I would like to a bit more "oil-flow" (is this correct english). To get this I would like to install a smaller pully on the pump, but are they available "off the shelf"? Thx Hendrik Quote Link to comment Share on other sites More sharing options...
TomG Posted January 3, 2008 Share Posted January 3, 2008 I think there is a mod where a hole on the inlet / outlet of the standard pump is made bigger for more flow. I don't know the details though and not sure if overheating the PS circuit would be an issue requiring a cooler? Problem with going to a much smaller pulley may mean the belt may start to slip under max load as there's less contact area. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 4, 2008 Share Posted January 4, 2008 You could install a higher flow pump, I think the Rover one is pretty poor compared to most. Mine is a ZF pump from a BMW. Quote Link to comment Share on other sites More sharing options...
Milemarker Type S Posted January 4, 2008 Share Posted January 4, 2008 A smaller pulley on the pump will not make any difference to the flow rate- the output flow is constant pretty much regardless of the speed at which it turns. You will need to change the pump to a higher flowrate one- Possibly a ZF74 which you can get from Allan at www.4x4winches.com new for about £135 +vat- he sometimes has good second hand ones as well. They are rated at 120bar and 13L/min (I believe that the flow is actually less than this going by the two on my truck). Or if you take a look at one on a scrap 7 series BMW you should find they they will be pretty similar... Shrek Quote Link to comment Share on other sites More sharing options...
Hendrik Posted January 4, 2008 Author Share Posted January 4, 2008 what about the pumps PSC supplies? seem to be reasonable priced: http://www.pscmotorsports.com/product_info...products_id=512 Quote Link to comment Share on other sites More sharing options...
TomG Posted January 5, 2008 Share Posted January 5, 2008 Looks interesting, decided to compare the spec to the ZF74: PSC Pump: Flow: 4.5 gpm (=17 litres/min) Pres: 1600psi (=110bar) ZF74 Pump: Flow: 12.5L/min (=3.3gpm) Pres: 120bar (=1740psi) (using US gallons in the conversion) Are the mountings fairly standard between different pumps or would it need custom brackets for LR engines? Quote Link to comment Share on other sites More sharing options...
Hendrik Posted January 6, 2008 Author Share Posted January 6, 2008 I think they need custom brackets, but I'll check it this week. Quote Link to comment Share on other sites More sharing options...
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