Also, you do not want a plastic line melting in the engine compartment in the event of a fire there. Plastic is susceptible to internal corrosion from the combustion acids in oil. Further check your burst pressure rating. In short, why risk it when you don't need to for the sake of a few cents!!
John Martindale Unit 39 40 Solitary Islands Way Sapphire Beach NSW 2450 AUSTRALIA ________________________________ From: Jeff Scott <jscott.pla...@gmx.com> Sent: Wednesday, December 15, 2021 12:58:07 AM To: krnet@list.krnet.org <krnet@list.krnet.org> Subject: KR>Re: oil pressure It is an Experimental, so you can do as you think best; However, the industry standard is as described by Randy Smith using a .040" orifice, and connecting with 1/8" copper line with a loop in the line between the engine and firewall to absorb the vibration. It's been successful through 100 years of aviation on hundreds of thousands of planes. The loop is a critical part of the installation to avoid cracking and failure. -Jeff Scott Arkansas Ozarks. > > I enjoy the KR Group because it seems like there are several of you out > there who know a whole lot more than me about KR's and airplanes in > general. A true resource. Thanks. > As to why I don't run copper tubing, it is because it seems much more > likely to fail from vibration and fatigue. Plastic is more likely to fail > from heat, age, and chafing. I am not too concerned about hot oil on my > legs because I doubt if the tube will fail in the cockpit. > I will check to see if I have a .040 restriction, and while I am at it, > I might as well replace the line (probably with plastic). And then I will > fly with complete confidence for the rest of my life... I'm pretty old. > > Gary Sack N81JM > > On Mon, Dec 13, 2021, 6:47 PM Randall Smith via KRnet <krnet@list.krnet.org> > wrote: > > > I am not sure why you would even run a plastic line for your oil pressure. > > Run it in 1/8 copper and put one loop in it for vibration. Every airplane I > > have owned has had the same set up whether it was certified or > > experimental. I also have always had a fitting with a .040 hole in it. > > > > Sent from my iPhone > > > > > On Dec 13, 2021, at 3:16 PM, Ed Janssen <ejanssen...@gmail.com> wrote: > > > > > > Seems like Steve Bennett told me once that that happened to him once > > while > > > flying his KR-1 which made quite a mess and at a high enough rate that he > > > wanted to get on the ground asap. Some KR drivers have been known to > > > replace plastic tubing annually to lower the risk of that happening. > > Cheap > > > precautions. > > > > > > Ed J. > > > > > >> On Mon, Dec 13, 2021 at 12:37 PM Gary Sack <garys...@gmail.com> wrote: > > >> > > >> Does anyone know what happens if the plastic capillary tube sending oil > > >> pressure back to the cockpit breaks? Mine is old, but in good > > condition. > > >> It I loose oil pressure reading and make a bit of a mess, I will chance > > it. > > >> If I lose 4 quarts of oil and seize the engine within a few minutes, I > > >> won't. > > >> Gary Sack. N81 JM > > >> ________________________________ > > >> -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html > > >> -Change list delivery options at > > >> https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info > > Board > > >> -Search recent KRnet Archives at > > >> https://list.krnet.org/empathy/list/krnet.list.krnet.org/ > > >> -Search < > > https://list.krnet.org/empathy/list/krnet.list.krnet.org/-Search> > > >> John Bouyea's decades of archive at > > >> https://www.mail-archive.com/krnet@list.krnet.org/ > > >> > > > ________________________________ > > > -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html > > > -Change list delivery options at > > https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board > > > -Search recent KRnet Archives at > > https://list.krnet.org/empathy/list/krnet.list.krnet.org/ > > > -Search John Bouyea's decades of archive at > > https://www.mail-archive.com/krnet@list.krnet.org/ > > ________________________________ > > -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html > > -Change list delivery options at > > https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board > > -Search recent KRnet Archives at > > https://list.krnet.org/empathy/list/krnet.list.krnet.org/ > > -Search <https://list.krnet.org/empathy/list/krnet.list.krnet.org/-Search> > > John Bouyea's decades of archive at > > https://www.mail-archive.com/krnet@list.krnet.org/ > ________________________________ > -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html > -Change list delivery options at > https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board > -Search recent KRnet Archives at > https://list.krnet.org/empathy/list/krnet.list.krnet.org/ > -Search John Bouyea's decades of archive at > https://www.mail-archive.com/krnet@list.krnet.org/ ________________________________ -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html -Change list delivery options at https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board -Search recent KRnet Archives at https://list.krnet.org/empathy/list/krnet.list.krnet.org/ -Search John Bouyea's decades of archive at https://www.mail-archive.com/krnet@list.krnet.org/ ________________________________ -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html -Change list delivery options at https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board -Search recent KRnet Archives at https://list.krnet.org/empathy/list/krnet.list.krnet.org/ -Search John Bouyea's decades of archive at https://www.mail-archive.com/krnet@list.krnet.org/
