---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 04/14/19: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:21 AM - Voltage regulator location (rvtach) 2. 08:00 AM - Re: Voltage regulator location (Jeffrey C Warren) 3. 08:21 AM - Re: Voltage regulator location (user9253) 4. 08:32 AM - Re: Re: Voltage regulator location (Jeffrey C Warren) 5. 11:03 AM - Re: Re: Voltage regulator location (Alec Myers) 6. 01:46 PM - Re: Voltage regulator location (DANIEL PELLETIER) 7. 03:04 PM - Re: Engine Compartment Connector Help PLEASE (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 07:21:26 AM PST US Subject: AeroElectric-List: Voltage regulator location From: "rvtach" I am close to finishing the firewall forward wiring of my RV-7A project and have been able to find very little guidance on where to locate the external voltage regulators. There will be two VRs- a VR-166 for the B & C 60 amp alternator and the PMR1C for the SD-8. The only clear recommendation from B & C says the PMR1C should be mounted on a metal surface for heat dissipation in an area with good air circulation and that the case temperature should be kept below 175 degrees F. So the choices are (1) Cabin side of the firewall where access is more difficult, cooling airflow likely minimal but ambient temperature is low or (2) engine side of the firewall where access is easier and likely lots of air swirling around (unconfirmed) but ambient temp is probably hotter. Where do people put these things? -------- Jim McChesney Tucson, AZ RV-7A Finishing Kit Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488730#488730 ________________________________ Message 2 _____________________________________ Time: 08:00:04 AM PST US From: Jeffrey C Warren Subject: Re: AeroElectric-List: Voltage regulator location I mounted my two B&C regs in an RV14A onto the left side of the pilots position about at my left thigh. Made some mounting plates to attach to two fuselage longerons. Area is dry and realitively easy to access and does not interfere with my legs. On Apr 14, 2019, at 10:20 AM, rvtach wrote: I am close to finishing the firewall forward wiring of my RV-7A project and have been able to find very little guidance on where to locate the external voltage regulators. There will be two VRs- a VR-166 for the B & C 60 amp alternator and the PMR1C for the SD-8. The only clear recommendation from B & C says the PMR1C should be mounted on a metal surface for heat dissipation in an area with good air circulation and that the case temperature should be kept below 175 degrees F. So the choices are (1) Cabin side of the firewall where access is more difficult, cooling airflow likely minimal but ambient temperature is low or (2) engine side of the firewall where access is easier and likely lots of air swirling around (unconfirmed) but ambient temp is probably hotter. Where do people put these things? -------- Jim McChesney Tucson, AZ RV-7A Finishing Kit Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488730#488730 ________________________________ Message 3 _____________________________________ Time: 08:21:00 AM PST US Subject: AeroElectric-List: Re: Voltage regulator location From: "user9253" Be sure to use heat conductive paste between the regulator and mounting surface. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488733#488733 ________________________________ Message 4 _____________________________________ Time: 08:32:25 AM PST US From: Jeffrey C Warren Subject: Re: AeroElectric-List: Re: Voltage regulator location Or, relieve the back-side of the mounting plate with a nice big hole for air circulation - there is more than a half inch clear space behind it to the external fuselage skin. On Apr 14, 2019, at 11:20 AM, user9253 wrote: Be sure to use heat conductive paste between the regulator and mounting surface. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488733#488733 ________________________________ Message 5 _____________________________________ Time: 11:03:00 AM PST US From: Alec Myers Subject: Re: AeroElectric-List: Re: Voltage regulator location I remember Bob saying that things arent especially hot forward of the forewall due to the cooling flow of air. Except sometimes immediately after landing. > On Apr 14, 2019, at 11:31, Jeffrey C Warren wrote: > > > Or, relieve the back-side of the mounting plate with a nice big hole for air circulation - there is more than a half inch clear space behind it to the external fuselage skin. > > On Apr 14, 2019, at 11:20 AM, user9253 wrote: > > > Be sure to use heat conductive paste between the regulator and mounting surface. > > -------- > Joe Gores > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=488733#488733 > > > > > > > > > > > > > > ________________________________ Message 6 _____________________________________ Time: 01:46:44 PM PST US From: DANIEL PELLETIER Subject: Re: AeroElectric-List: Voltage regulator location Personnaly I put it que on the top of firewall and pour use a 12 bolts small compter fan. Works great. Ican send you picture uf you want. Daniel Pelletier > Le 14 avr. 2019 10:20, rvtach a crit : > > > I am close to finishing the firewall forward wiring of my RV-7A project and have been able to find very little guidance on where to locate the external voltage regulators. There will be two VRs- a VR-166 for the B & C 60 amp alternator and the PMR1C for the SD-8. The only clear recommendation from B & C says the PMR1C should be mounted on a metal surface for heat dissipation in an area with good air circulation and that the case temperature should be kept below 175 degrees F. > > So the choices are (1) Cabin side of the firewall where access is more difficult, cooling airflow likely minimal but ambient temperature is low or (2) engine side of the firewall where access is easier and likely lots of air swirling around (unconfirmed) but ambient temp is probably hotter. > > Where do people put these things? > > -------- > Jim McChesney > Tucson, AZ > RV-7A Finishing Kit > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=488730#488730 > > > > > > > > > ________________________________ Message 7 _____________________________________ Time: 03:04:09 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Engine Compartment Connector Help PLEASE > > >The dilemma is that the two cables (containing 9 >conductors each) that run from the crank sensor >at the nose of the engine to the ignition >modules mounted on the cold side of the firewall >are too short to be able to move the engine out >far enough to gain access to the accessory >case=85the crank sensor end of the cables are >soldered to the crank sensor PC board and the >ignition module end is on the cold side of the >firewall and it has D-Sub connectors that are >too large to pull out through the firewall wire >conduit (see picture of conduit before all of >the other wires were run through it. The most robust/reliable is to simply extend the harnesses with additional wire SPLICED onto the original harness such that excess wire forms a service-loop that is coiled and tied off for normal operations. > >So I am considering cutting the 9 conductor >cables in half on the engine side of the >firewall and using some kind of VERY RELIABLE >connector to splice these VERY IMPORTANT cables. Close cousins to these connectors are found under the hood of bizillions of vehicles. They are dust/water tight. https://tinyurl.com/y3yl5ls2 Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.