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

Dave davel at emspace.com
Thu Jun 9 17:00:29 EDT 2016


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 <davel at emspace.com>
> *To:* 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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-------------- next part --------------
   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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References

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   2. mailto:detomaso at server.detomasolist.com
   3. mailto:DeTomaso at server.detomasolist.com
   4. http://server.detomasolist.com/mailman/listinfo/detomaso
   5. mailto:DeTomaso at server.detomasolist.com
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