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Thread: UN1 bell house adapter plate

  1. #1
    Member delgato's Avatar
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    UN1 bell house adapter plate

    Would any of you fine folks have a File of the bell housing measurements that you would be willing to share?

    I am going to make an adapter plate for my electric motor to attach to the trans.

    I have the info for the motor I plan to use.

    It would be nice to have the correct UN1 manual trans measurements.

    I know I could hand make an adapter plate easy enough.

    However, it would be far better to have something more accurate made since it will need handle the motor spinning 4000RPMs or more.

    Any assistance would be appreciated.

  2. #2
    Not a DeLorean Guru
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    Get a hold of Josh Schattenkirk or Nick Roedl.
    -Mike
    1981 DeLorean, heads/cams/exhaust, EFI
    1999 Corvette, heads/cam/exhaust, 440 BHP
    2005 Elise, stock
    2016 Chevy Cruze

  3. #3
    Senior Member Josh's Avatar
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    http://www.gt40s.com/forum/gt40-tech...-download.html

    Read through the thread, there is a pdf in it with the details you need. I can confirm these dimensions are correct.

    I would not reccomend making it by hand, you can get a 1/2" adapter plate laser or waterjet cut for a reasonable price and it will be accurate to at least 0.010". But that is just me.
    Last edited by Josh; 08-22-2017 at 10:43 PM.

  4. #4
    LS1 DMC Nicholas R's Avatar
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    What he said^

    Start with the ford plate listed in that thread. It will give you the UN1 bolt and dowel locations relative to the center of the input shaft, which is really all you need.

    Also like Josh said, do not do this by hand. This needs to be precision machined. Laser/Waterjet/CNC, one of these is a must; you need the accuracy.

  5. #5
    Member delgato's Avatar
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    Thank you for this info.

    Now I will have a very good starting point to begin this journey(into madness).

  6. #6
    Delorean Guru
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    Quote Originally Posted by delgato View Post
    Thank you for this info.

    Now I will have a very good starting point to begin this journey(into madness).
    No matter how well the adapter plate is machined, it will still have to be centered to limit the amount of run-out. Run-out should be less than .003 as a general rule. Once centered you should then pin it to the bell housing so it can't move. You cannot depend on the bolts to hold it in position, the dowels or pins should do that. Failure to get that adapter plate right will result in a lot of broken parts from the input shaft of the transmission to the input bearing, clutch and other parts. It is not just concentricity, but also how far in the transmission,input shaft goes into the pilot bearing in the crank. This is critical machine work and must be checked after the part is made.
    David Teitelbaum

  7. #7
    Not a DeLorean Guru
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    Quote Originally Posted by David T View Post
    No matter how well the adapter plate is machined, it will still have to be centered to limit the amount of run-out. Run-out should be less than .003 as a general rule. Once centered you should then pin it to the bell housing so it can't move. You cannot depend on the bolts to hold it in position, the dowels or pins should do that. Failure to get that adapter plate right will result in a lot of broken parts from the input shaft of the transmission to the input bearing, clutch and other parts. It is not just concentricity, but also how far in the transmission,input shaft goes into the pilot bearing in the crank. This is critical machine work and must be checked after the part is made.
    Dave, how many engine swaps have you done yourself?
    -Mike
    1981 DeLorean, heads/cams/exhaust, EFI
    1999 Corvette, heads/cam/exhaust, 440 BHP
    2005 Elise, stock
    2016 Chevy Cruze

  8. #8
    Delorean Guru
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    Quote Originally Posted by opethmike View Post
    Dave, how many engine swaps have you done yourself?
    I have been involved with several, none of then Deloreans. What we are talking about here is simple mechanics. Bottom line, if you are going to attach a different transmission to the motor it is imperative that they be lined up correctly to avoid problems. If you don't know what you are doing and/or don't have the proper equipment, you need a good shop that does. Making an adapter plate is not an "off the shelf" kind of thing. It is a custom made part.
    David Teitelbaum

  9. #9
    Not a DeLorean Guru
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    Quote Originally Posted by David T View Post
    I have been involved with several
    So, you, yourself - none then?
    -Mike
    1981 DeLorean, heads/cams/exhaust, EFI
    1999 Corvette, heads/cam/exhaust, 440 BHP
    2005 Elise, stock
    2016 Chevy Cruze

  10. #10
    Senior Member Ras12's Avatar
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    Quote Originally Posted by David T View Post
    No matter how well the adapter plate is machined, it will still have to be centered to limit the amount of run-out. Run-out should be less than .003 as a general rule. Once centered you should then pin it to the bell housing so it can't move. You cannot depend on the bolts to hold it in position, the dowels or pins should do that. Failure to get that adapter plate right will result in a lot of broken parts from the input shaft of the transmission to the input bearing, clutch and other parts. It is not just concentricity, but also how far in the transmission,input shaft goes into the pilot bearing in the crank. This is critical machine work and must be checked after the part is made.
    I have not done any motor swaps nor have I been remotely involved with any.

    However, to David's point, pinning it to the bell housing in theory "should" prevent premature movement should the bolts loosen. Pinning things together to prevent future movement has been done for centuries from cars to construction and even in medical applications like orthopedic surgeries so irrespective of one's experience, I would say it is cheap, smart added assurance. But then again, I have never done any seriously major engine work other than basic maintenance and repairs so what the hell do I know...and I'm not being sarcastic...truthfully, I wouldn't have a clue other than my common sense analysis above.
    SEARCHING FOR VIN#16664
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    1987 Audi Coupe GT (FOR SALE or TRADE - Runs & Drives Great)

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