Ok guys, i can across a situation the other day that had a fellow mechanic and myself arguing. We were replacing a few lines on an oil cooler and remote filter housing. Three lines totaling about 4 1/2' in length. The stock hoses were 5/8" but went down to 1/2" npt fittings at each end. Since the fittings were only 1/2" could we simply use 1/2" hose? I know there is some hydraulic theory behind this but that hydraulic engineering course i took in college is escaping me at the moment What do you guys think?
You'd probably get away with it, but it would be more pressure drop for the same flow. As far as I know, resistance to flow is cumulative, the resistance of each part of the circuit adds up to the total. Be extremely careful using engineering theory in the real world, and even more careful when letting engineers touch anything.
Oh Delmar, your last comment really makes me wish that HEF had a "LIKE" button, the same as FaceBook.
Kev815 ,no the 1/2'' hose fittings will have smaller i/d than the hose ends as used in the 5/8'' hose so you will be pushing oil though a hole 4 1/2' long and return with a lose of flow