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
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| Subject: | Voltage regulator location |
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
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| Subject: | Re: 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 <rvtach@msn.com> 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
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| Subject: | Re: Voltage regulator location |
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
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| Subject: | 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 <fransew@gmail.com> 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
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| Subject: | 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 <heffnhane@mac.com> 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 <fransew@gmail.com> 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
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| Subject: | Re: 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 <rvtach@msn.com> 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
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| Subject: | Re: 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 . . .
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