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R-134a retrofit for OEM stock Dino A/C system: Any Interest ?

Discussion in '206/246' started by synchro, Aug 17, 2019.

  1. synchro

    synchro F1 Veteran

    Feb 14, 2005
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    Hey, been making progress.

    Three generations of Dino 246 evaporator development L to R;
    - Original OEM,
    - OEM with added R-134a fittings (in OEM case, TX valve mounted)
    - New 4 row 16 pass copper with R-134a fittings


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  3. synchro

    synchro F1 Veteran

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    #27 synchro, Jun 29, 2020
    Last edited: Jun 29, 2020
    This replaces That around the drier
    Full functionality, 3 fewer sealing surfaces and 2 pressure sensor switches recalibrated for R-134a higher pressures with O-Ring seals at every port and junction. I strive to remove hose bends that disrupt refrigerant flow and add turbulence for straight line hoses that allow refrigerant to travel unimpeded through the system. The compressor has a 40% increase in CFM flow rate and the condensor has a 20% increase in heat exchange surfaces so that extra flow will be wisely used


    PS - I'm ready with all parts/tools to custom fit R-134a systems to Dinos and the first conversion candidate arrives in my garage July 15th for a Full stage 1 replacement.
    Stay tuned for a retrofit to R-134a thread. This should also help DIYs that want to evaluate if this is a task for them.

    Future A/C improvement tasks on the horizon:
    - Stage 2: Air flow rate Improvements
    - Stage 3: Adding A/C flow to existing kick panel vents

    View attachment 2965214
     

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  4. Jamie H

    Jamie H Formula 3
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    Very interesting, are you upgrading to the york/tecumseh style compressor? Very nice looking evaporator btw.

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  5. synchro

    synchro F1 Veteran

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    #29 synchro, Jul 2, 2020
    Last edited: Jul 2, 2020
    Yes, Using York for the original exterior form factor identical to OEM. They have the patents from the old York compressor company.

    BUT, my tags say it is a 1972 Aspera Frigo unit :)
    .... and OEM mounted those tags in a very visible place for Concours Judges to see.


    First client "Full install" occurs in 2 weeks, I'll get to check hose lengths and fittings on a second Dino. These cars are hand built so I'm interested to see the variations in install and how it affects selling kits
     

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  6. synchro

    synchro F1 Veteran

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    Only 6 kits remain, then production of the ten commissioned sets will be complete.
     
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  8. synchro

    synchro F1 Veteran

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    Stage 2 is progressing into prototyping to add a hidden SPAL 400cfm fan to the supply side.

    Here are my parts layout before I install these in Dino 06472, the complete STAGE 1 R134a conversion kit
    NOTE: OEM LABELS have been fabricated and not shown yet
     

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  9. Jamie H

    Jamie H Formula 3
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    Very nice work !! As usual :)

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  10. synchro

    synchro F1 Veteran

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    #33 synchro, Aug 21, 2020
    Last edited: Aug 21, 2020
    Reproduction tags are finished.
    Only Aspera Frigo tagged compressors are permitted :)
    These are mounted front and top, so are somewhat visible in concours events

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  11. synchro

    synchro F1 Veteran

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  13. Ludo Boon

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  14. synchro

    synchro F1 Veteran

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    #36 synchro, Oct 17, 2020
    Last edited: Oct 17, 2020
    Yes, if your client wants to re-use an old evaporator that will work also. You can modify an old evaporator by cutting the flare fitting off and brazing on a new R-134a fitting.
    It is not new or clean like our remanufactured ones, but I tried it before I finally had new ones produced
    Here is that prototype in front of an original

    Also including TAV 39/40 for your viewing of complete system

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  15. Ludo Boon

    Ludo Boon Rookie
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    hello, thank you for your answer. How much does a new made one cost?
    Do you have other parts we need?
    we have the console and knobs for the interior, thats all we have at this point.
    also need the dash piece with 3 blower holes, the non ac car has 2

    Ludo
     
  16. synchro

    synchro F1 Veteran

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    Sounds like your customer is open to used parts.
    I have two used OEM evaporators from 1973, these are the prototypes and I no longer need them. Both are made from Copper. One with the original Flare fittings and one with flare fittings cut off then R-134a fittings brazed on. Both have rust on their side mounting plates, have not been flushed and have various fins bent/missing/soiled. Any interest in these?

    Look behind the brake boooster, you may already have the 3 hole dash vent attach plate.
    All Dinos that I have seen have 3 airflow vents under the dash with three tubes to attach the 80mm duct hose.
    It is the dash that only has two or three holes.

    Sorry, I have not even thought about individual parts pricing. I am a private party that wanted new and working A/C in Dino 05702 but got caught up having to buy tooling and pay to have parts made in a production run.

    You may want to wait....
    In December I am scheduling fabrication time for my new evaporator housing to pair with the new evaporator. It will fit in the OEM location exactly but will have a new fan on tyhe supply side with a max output of 400CFM to force air across the evaporator and is driven by 3 speed individual relays with auto re-setting circuit breaker protection.
    The new supply fan is placed in concert with the OEM exhaust fan to solve four serious deficiencies in the OEM system:
    - Overcoming the static pressure of the evaporator
    - provides Fibonacci smooth scroll air delivery to full width of the evaporator face
    - Increases total airflow by 40% at all 5 outlets
    - removes three 90 degree bends in the ducting pathwork and their flow loss
     
  17. swift53

    swift53 F1 Rookie
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    Scott, I think I need one set :)
    Now is the time for installation, dear 03724 something of originality for once, yay...
    Wrote you a pm.

    Regards, Alberto
     
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  18. Ludo Boon

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    Hello is your message for me? Ludo
     
  19. swift53

    swift53 F1 Rookie
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    Scott, Just sent it.

    Regards, Alberto
     
  20. swift53

    swift53 F1 Rookie
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    Hello Ludo,

    We have an extra dash piece with 3 blower holes.
    Please pm so we can talk more about it.

    Regards, Alberto
     
  21. synchro

    synchro F1 Veteran

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    COVID has caused shortages and some crazy price increases.
    Thermal eXpansion Valves (TXV) have tripled in cost, when you can find them.
     

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