[DeTomaso] Hooking an MSD 6AL Rev Limiter to disengage the A/C Compressor

[Larry Weston]

Is it the revs or the high side pressure build up that does in the compressor?


Could it be as easy as using a trinary switch high side limit switch to cut out the compressor clutch?


________________________________
From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of Dave <davel at emspace.com>
Sent: Thursday, June 9, 2016 3:28 PM
To: detomaso at server.detomasolist.com
Subject: Re: [DeTomaso] Hooking an MSD 6AL Rev Limiter to disengage the A/C Compressor

Hey Rob

A 6AL only limits the coil drive output.

A 6AL-2 or a 6AL plus has a Retard Step output
"Retard Step. This retard is activated when 12 volts are applied and rpm
is above the Step1 Rpm value."

It's meant to keep those 14:1 motors from blowing the teeth off the
ring-gear,
but just program it to go true at 4000 and do your thing with a relay.

dave


On 6/9/2016 6:19 AM, Rob Dumoulin wrote:
>     It appears engine revs killed my Sanden rotary compressor.A  That or it
>     was a cheaper build.A  Regardless, my new motor will rev even higher
>     and this time I am installing a high-pressure shut-off valve.A  In
>     addition, I'd like to use the rev limiter feature of the 6AL to shut
>     off the compressor so I won't kill another one.
>     I have heard of such a mod but have not seen technically how to make it
>     work.A  Anybody know what MSD parts are needed and how to hook it up to
>     the A/C?
>     RobA
>
>
>
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-------------- next part --------------
   Is it the revs or the high side pressure build up that does in the
   compressor?

   Could it be as easy as using a trinary switch high side limit switch to
   cut out the compressor clutch?
     __________________________________________________________________

   From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of
   Dave <davel at emspace.com>
   Sent: Thursday, June 9, 2016 3:28 PM
   To: detomaso at server.detomasolist.com
   Subject: Re: [DeTomaso] Hooking an MSD 6AL Rev Limiter to disengage the
   A/C Compressor

   Hey Rob
   A 6AL only limits the coil drive output.
   A 6AL-2 or a 6AL plus has a Retard Step output
   "Retard Step. This retard is activated when 12 volts are applied and
   rpm
   is above the Step1 Rpm value."
   It's meant to keep those 14:1 motors from blowing the teeth off the
   ring-gear,
   but just program it to go true at 4000 and do your thing with a relay.
   dave
   On 6/9/2016 6:19 AM, Rob Dumoulin wrote:
   >     It appears engine revs killed my Sanden rotary compressor.A  That
   or it
   >     was a cheaper build.A  Regardless, my new motor will rev even
   higher
   >     and this time I am installing a high-pressure shut-off valve.A
   In
   >     addition, I'd like to use the rev limiter feature of the 6AL to
   shut
   >     off the compressor so I won't kill another one.
   >     I have heard of such a mod but have not seen technically how to
   make it
   >     work.A  Anybody know what MSD parts are needed and how to hook it
   up to
   >     the A/C?
   >     RobA
   >
   >
   >
   > _______________________________________________
   >
   >
   > Detomaso Forum NO LONGER Managed by POCA
   > Posted emails must not exceed 1.5 Megabytes
   > DeTomaso mailing list
   > DeTomaso at server.detomasolist.com
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   [2]DeTomaso Info Page
   server.detomasolist.com
   This is the DeTomaso mailing list, a free and open forum for the
   discussion of issues surrounding all DeTomaso automobiles. This is an
   unmoderated mailing list ...
   >
   > To manage your subscription (change email address, unsubscribe, etc.)
   use the links above.
   >
   > Members who post to this list grant license to the list to forward
   any message posted here to all past, current, or future members of the
   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.

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