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Re: D.I.Y. Oil Pressure Gauge. Need opinions on 8 ft. hose length. 200 1993

posted by  someone claiming to be Gary Smith on  Tue Oct 16 10:34 CST 2001 [RELATED]

STOP!

Don't use fuel line for oil pressure! Instead go to an industrial supply house (like Grainger) and get the right length of 1/4" (or 1/8" if possible) hydraulic hose which is MEANT for elevated temperature oil. It'll cost you 10 bucks or so, but it'll be much safer than fuel line which is typically not suited for temps much over 100F. Make sure the gauge you use is capable of 100 psi or more.

As to your question about the length of the hose and its flexing affecting the readings, the short answer is "not enough to be concerned with." This is a non-flowing application, so the hose diameter and length really will only affect the rate at which the pressure readings change. I work in an aerospace fluids lab (air to 1200F & 3500 psig, oil to 350F & 7500 psig, and we routinely use 1/4 lines for static pressure measurements; I think most mecanical pressure gauges used for automotive applications are 1/8" diameter. As far as the flexing of the line, this actually works to dampen out sharp pressure spikes (I wouldn't expect any) and preserve the Bourdon tube movement in the gauge.

Good luck!





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