| [GMCnet] Another mystery ignition module failure [message #334243] |
Sat, 30 June 2018 08:51  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
|
Senior Member |
|
|
I, too, found this very informative. I was especially interested to see the note about the small drill mark on the drive gear. It says if that is not properly aligned then the distributor will be 3 degrees out of phase. Never heard that before. As many times as I had distributors out and put them back on our two coaches it would only be random luck if I got them properly aligned. No mention of how that might effect performance but one would expect that to impact the magnetic field and current in the coil.
When installing the FITECH fuel injection I learned that the wire size changes inside the bundle on the wire going to B+. That transition point is also a place where corrosion could play a role in less than optimum performance.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed & hand crafted
in the 1907 former Masonic Temple building
in historic Kerby, OR
http://jerrywork.com
========
Message: 13
Date: Sat, 30 Jun 2018 07:27:59 -0400
From: Ken Henderson
To: GMC Mail List
Subject: Re: [GMCnet] Another mystery ignition module failure
Message-ID:
Content-Type: text/plain; charset="UTF-8"
JD,
Thanks for that link! That's by far the best HEI description I've ever
seen. And it even has a reference to the GMC MH!!!
Ken H.
On Sat, Jun 30, 2018 at 12:42 AM Jdlisenby@hotmail.com <
jdlisenby@hotmail.com> wrote:
> The module discussion led me down the internet rabbit hole reading up on
> the HEI, I haven't worked on one since high school. I found this discussion
> useful, with a good description of proper coil selection and applications.
> http://www.pontiacpower.org/HEI.pdf
> --
==========
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Jerry & Sharon Work
78 Royale
Kerby, OR
|
|
|
|
| Re: [GMCnet] Another mystery ignition module failure [message #334245 is a reply to message #334243] |
Sat, 30 June 2018 09:25  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
|
Senior Member |
|
|
Another thing I found new to me were all the running changes to wire harness, ground wire/strap, cap and rotor. My very good local NAPA store and I always used 1976 455 as the target when looking for parts for either our 77 Clasco 455 or our 78 Royale 455 (engine replaced when new with a turbo 455 that was later changed to non-turbo 455). We always used the yellow wire coil to get polarity right, but it sounds like I/we really needed to be more specific in matching all the parts to the actual distributor in the coach. It it is not known original to that specific engine, the distributor could be from any where along the running change line. Year alone is not enough and who knows if those running changes survived the parts consolidation efforts by the OEM part suppliers or aftermarket parts suppliers.
The good news is both coaches performed really well so maybe I am making too much out of all this.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed & hand crafted
in the 1907 former Masonic Temple building
in historic Kerby, OR
http://jerrywork.com
> On Jun 30, 2018, at 6:51 AM, Gerald Work wrote:
>
> I, too, found this very informative. I was especially interested to see the note about the small drill mark on the drive gear. It says if that is not properly aligned then the distributor will be 3 degrees out of phase. Never heard that before. As many times as I had distributors out and put them back on our two coaches it would only be random luck if I got them properly aligned. No mention of how that might effect performance but one would expect that to impact the magnetic field and current in the coil.
>
> When installing the FITECH fuel injection I learned that the wire size changes inside the bundle on the wire going to B+. That transition point is also a place where corrosion could play a role in less than optimum performance.
>
> Jerry
>
> Jerry Work
> The Dovetail Joint
> Fine furniture designed & hand crafted
> in the 1907 former Masonic Temple building
> in historic Kerby, OR
> http://jerrywork.com
> ========
> Message: 13
> Date: Sat, 30 Jun 2018 07:27:59 -0400
> From: Ken Henderson
> To: GMC Mail List
> Subject: Re: [GMCnet] Another mystery ignition module failure
> Message-ID:
>
> Content-Type: text/plain; charset="UTF-8"
>
> JD,
>
> Thanks for that link! That's by far the best HEI description I've ever
> seen. And it even has a reference to the GMC MH!!!
>
> Ken H.
>
>
> On Sat, Jun 30, 2018 at 12:42 AM Jdlisenby@hotmail.com jdlisenby@hotmail.com> wrote:
>
>> The module discussion led me down the internet rabbit hole reading up on
>> the HEI, I haven't worked on one since high school. I found this discussion
>> useful, with a good description of proper coil selection and applications.
>> http://www.pontiacpower.org/HEI.pdf
>> --
> ==========
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Jerry & Sharon Work
78 Royale
Kerby, OR
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
