Results 1 to 6 of 6

Thread: '73 911T MFI questions

  1. 06-19-2020, 03:58 AM #1
    Hankus
    Hankus is offline
    Junior Member
    Join Date
    Jun 2020
    Location
    San Antonio
    Posts
    4

    '73 911T MFI questions

    Cousins, I am bringing back my '73 911T with 58K miles, MFI fuel injection. It's been sitting for about 20 years, so my son and I are going through the fuel system first. We have the tank out, will clean it up, and inspect to see if it can be used or needs to be replaced. We also plan to clean out the fuel lines, replace hoses, fuel filter, etc. I am somewhat resigned to send the MFI pump to a rebuilder, but what should I do before I take the pump out? I.E., should we try to start the car, see what happens, run Seafoam or some such through the system, etc. What about the injectors? Lastly, what MFI guys are recommended for a refurbish?

    Hank Auderer
    San Antonio
    Reply With Quote Reply With Quote
  2. 06-19-2020, 06:53 AM #2
    RSTarga
    RSTarga is offline
    member #1515
    Join Date
    Mar 2009
    Location
    San Antonio, Texas
    Posts
    4,261
    I highly recommend you talk to Kathy at Jones Autowerkes in San Antonio 210-657-1111
    Bob Jones is highly experienced with MFI, they have been servicing my car for over 40 years.
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs
    Reply With Quote Reply With Quote
  3. 06-21-2020, 10:08 PM #3
    zenithblue71T
    zenithblue71T is offline
    Senior Member zenithblue71T's Avatar
    Join Date
    Dec 2009
    Location
    Copenhagen, Denmark
    Posts
    270
    Mark Jung is a helpful guy for all things MFI.

    https://www.mfiwerks.com/

    He also correctly diagnosed my PMO issue late at night without hearing my motor run.
    James Hurst #1638
    R Gruppe #514
    911T with 2.2S Ps and Cs, Solex grind Cams and PMO 40mm
    Reply With Quote Reply With Quote
  4. 06-22-2020, 07:41 AM #4
    Arne
    Arne is offline
    Serial old car rescuer Arne's Avatar
    Join Date
    Aug 2011
    Location
    Eugene, OR
    Posts
    1,959
    I sent my pump and all 6 injectors to Mark at MFIWerks. They came back ready to go, and Mark then identified a hard-to-find issue with fuel delivery, just from me describing the problem here. Highly recommended.

    I would not try to start it before having the pump serviced. You don't want to force the sludge and varnish to move around and potentially make things even worse.
    - Arne
    Current - 2018 718 Cayman, Rhodium Silver, PDK

    Sold - 1972 911T coupe, Silver Metallic; 1984 911 Carrera coupe, Chiffon white; 1973 914 2.0, Saturn Yellow; 1984 944, Silver Metallic
    Reply With Quote Reply With Quote
  5. 06-22-2020, 12:42 PM #5
    NorthernThrux
    NorthernThrux is offline
    Senior Member NorthernThrux's Avatar
    Join Date
    Jun 2012
    Location
    London, Ontario, Canada
    Posts
    2,258
    You can refurbish an MFI pump to specs and Mark and a number of others are geniuses in this regard. If the rest of the motor is stock, then just small adjustments to the MFI will get your CO2 into spec and off you go. If your engine isn't stock, then you really need to modify the space cam to match fuel to air flow, and that can only be done with the motor and the MFI on a dyno.

    Ravi
    Early 911S Registry # 2395
    1973 Porsche 911S in ivory white 5sp MT
    2015 Porsche Macan S in agate grey 7sp PDK
    Reply With Quote Reply With Quote
  6. 06-25-2020, 02:16 PM #6
    Hankus
    Hankus is offline
    Junior Member
    Join Date
    Jun 2020
    Location
    San Antonio
    Posts
    4
    Thank you all for the sage advice. I will report back with progress when it happens. Thanks again!
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules


Message Board Disclaimer and Terms of Use
This is a public forum. Messages posted here can be viewed by the public. The Early 911S Registry is not responsible for messages posted in its online forums, and any message will express the views of the author and not the Early 911S Registry. Use of online forums shall constitute the agreement of the user not to post anything of religious or political content, false and defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise to violate the law and the further agreement of the user to be solely responsible for and hold the Early 911S Registry harmless in the event of any claim based on their message. Any viewer who finds a message objectionable should contact us immediately by email. The Early 911S Registry has the ability to remove objectionable messages and we will make every effort to do so, within a reasonable time frame, if we determine that removal is necessary.