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

Dave davel at emspace.com
Thu Jun 9 20:02:33 EDT 2016 

No, no, no - I had my head up my butt.

The MSD 8950 is the right part.

That line on the MSD6AL-2 is an input.
It has the use I was talking about, but you connect it in parallel to 
the starter solenoid input to back out the advance while cranking.

Larry - it just took me a while to notice the extra weight on my shoulders.

Dave

On 6/9/2016 2:00 PM, Dave wrote:
>     Good.
>
>     Probably only a hundred bucks if you didn't want the other -2 features.
>
>     dave
>
>     On 6/9/2016 1:22 PM, Forest Goodhart wrote:
>
>     You could use an MSD 8950 rpm switch and relay for this.
>     Forest
>       __________________________________________________________________
>
>     From: Dave [1]<davel at emspace.com>
>     To: [2]detomaso at server.detomasolist.com
>     Sent: Thursday, June 9, 2016 12:28 PM
>     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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>     1. mailto:davel at emspace.com
>     2. mailto:detomaso at server.detomasolist.com
>     3. mailto:DeTomaso at server.detomasolist.com
>     4. http://server.detomasolist.com/mailman/listinfo/detomaso
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-------------- next part --------------
   No, no, no - I had my head up my butt.

   The MSD 8950 is the right part.

   That line on the MSD6AL-2 is an input.
   It has the use I was talking about, but you connect it in parallel to
   the starter solenoid input to back out the advance while cranking.

   Larry - it just took me a while to notice the extra weight on my
   shoulders.

   Dave

   On 6/9/2016 2:00 PM, Dave wrote:

   Good.

   Probably only a hundred bucks if you didn't want the other -2 features.

   dave

   On 6/9/2016 1:22 PM, Forest Goodhart wrote:

   You could use an MSD 8950 rpm switch and relay for this.
   Forest
     __________________________________________________________________

   From: Dave [1][1]<davel at emspace.com>
   To: [[2]2]detomaso at server.detomasolist.com
   Sent: Thursday, June 9, 2016 12:28 PM
   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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References

   1. [9]mailto:davel at emspace.com
   2. [10]mailto:detomaso at server.detomasolist.com
   3. [11]mailto:DeTomaso at server.detomasolist.com
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   5. [13]mailto:DeTomaso at server.detomasolist.com
   6. [14]http://server.detomasolist.com/mailman/listinfo/detomaso
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   9. mailto:davel at emspace.com
  10. mailto:detomaso at server.detomasolist.com
  11. mailto:DeTomaso at server.detomasolist.com
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