Power steering hoses.
06-10-2017, 05:12 PM
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Power steering hoses. I am installing a new power steering pump with a Turn One pulley and a new reservoir, and putting in a power steering cooler as well. With all this I am converting all the lines to AN hoses and AN fittings. I have searched and get some conflicting information on the type of hose to use. Not size or pressure rating but the makeup of the hose. Specifically whether it should be CPE inner core or PTFE inner core. I have seen CPE hoses recommended for the power steering return (low pressure) side but then PTFE recommended for the feed line from the pump (high pressure). Based on that, it would seem that both CPE and PTFE cores are compatible with power steering fluid, but PTFE is recommended for high pressure. Yet I see steel and nylon braided hose with a CPE core rated in excess of the pressure from the pump. Anyone have the rationale for why CPE would be ok for the return lines but not the high pressure side even if it is rated in excess of the pressures the system is capable of producing? This is on a 2000 Corvette, LS1. Thanks for any insight on this. 
06-10-2017, 09:10 PM
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06-11-2017, 07:45 AM
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Honestly the liner material has more to do with it's compatibility with the fluid then it's pressure rating. CPE was originally developed in the 50's and primarily used for military to supply fluids in aircraft. As fluid technology has evolved and addatives have come into play PTFE came along as it doesn't break down or degrade in diesel. Which is one step above crude in the refining process. CPE would work but mong term I'd go PTFE personally
06-11-2017, 09:08 AM
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Honestly the liner material has more to do with it's compatibility with the fluid then it's pressure rating. CPE was originally developed in the 50's and primarily used for military to supply fluids in aircraft. As fluid technology has evolved and addatives have come into play PTFE came along as it doesn't break down or degrade in diesel. Which is one step above crude in the refining process. CPE would work but mong term I'd go PTFE personally