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Thread: A question for you Supercharger Guruís

  1. #1
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    A question for you Supercharger Guruís

    I have a question for you Supercharger Guruís. I am working on a custom supercharger project using a supercharger off a Supercoup. The supercharger I bought is new and did not have a pulley attached. I have since obtained a pulley and am ready to install.
    My questions are as follows:

    1. When installed, is the pulley flush with the end of the shaft? If not, how much does the shaft protrude past the pulley?

    2. If I freeze the supercharger and heat the pulley to 500 degrees, can I drive it on (gently) with a hammer or does it have to be pressed on? If it does need to be pressed on, does the nosepiece need to be removed to do so?

    Any information you can give me will be greatly appreciated.
    Thanks.

  2. #2
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    Wink Hope this helps

    Keeping the pulley hot and blower cold is a cool idea, but I hope you got some good gloves. I just wobbled the pulley on to a certain point, and then used the nut to tighten it on the rest of the way. I had to use vise grips to hold the pulley while tightening the nut also. Some choose the easier and more pricey route of buying a supercharger pulley installation/removal tool.

  3. #3
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    pearl95sc, thanks for the reply.
    After reading your post I did some searches and it seems I've got a different snout on my blower then the ones I see in pictures posted here. The shaft appears to be just as long but without a threaded end. The shaft is the same diameter since the pulley would be a tight fit. Also everything else from the Supercoup bolted right up. ????!!!

    Anyone here have a blower with a pulley that is pressed on (no nut)?

  4. #4
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    You must have a GM blower they are pressed on. Try here for more info

  5. #5
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    You must have a GM blower they are pressed on. Try here for more info

  6. #6
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    Does it have a keyway and a nut, or a bolt and no keyway?

    Does it look like this? Early Ford M90

    http://cgi.ebay.com/ws/eBayISAPI.dll...category=43808

    Does it look like this? Late Ford M90

    http://cgi.ebay.com/ws/eBayISAPI.dll...category=33741

    Does it look like this? Late GM M90

    http://cgi.ebay.com/ws/eBayISAPI.dll...category=33617

    Does it look like this? Early GM M62

    http://cgi.ebay.com/ws/eBayISAPI.dll...category=42604


    Jeff

  7. #7
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    J57ltr,

    It looks like an early Ford M90 but without the threads for a nut. It does not look like a GM M90 because the intake port is the same as early Supercoups and mine will mount the 3.8 top hat just like the Supercoup.

    Seems to be some kind of hybrid.

    My concern is if it will damage the nosepiece bushings/bearings if I drive the pulley on gently. I don't see any way to press it on without removing the nosepiece.

    I am not worried about the pulley coming off since this is the way most M112 blowers mount their pulley. Since this is a custom install on a 4.6 engine, I can adjust for any differences in the nose length when I fabricate the mounting plate.

  8. #8
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    Does it have internal threads? Try to post a pic.

    A GM M90 snout is longer and can be made to fit. But a pressed on pulley needs just that, a press. Hammering will damage the bearings.

    Jeff

  9. #9
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    J57ltr,

    Thanks. I'm pritty sure the shaft is solid (no internal threads). I will try to get a picture up in the next day or two.

    If I remove the nose piece, will I have access to the back of the shaft so I can press it on properly? Also, anything I need to know when taking off the nose piece?

  10. #10
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    Post a pic B4 you take it apart. Lets see what it is.

    If not I will take some pics of the GM/Ford/Jag SC snouts I have.

    Jeff

  11. #11
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    J57ltr,
    Yes I will get pictures up before I start working on it.

    Thanks.

  12. #12
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    This thread has some pics and more info on M90 blowers that someone else had with no threads on the shaft:

    http://host.sccoa.com/forums/showthr...threadid=29944

  13. #13
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    Here are a couple of pics. Left to right Jag M112, Ford M90, GM M90. The GM snout was turned down on the end for a smaller pulley (or so I was told by the previous owner).
    Attached Images Attached Images  

  14. #14
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    Here is a closer view of the M90's.

    I'm betting that George's thread he found is the answer.
    Attached Images Attached Images  

  15. #15
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    It looks just like the early Supercoup M90 except it looks like someone cut the threads off. I know this was a test unit for Eaton Quality Assurance and has never been on an engine.
    It was broken in at Eaton, tested for QA then rebuilt and sold as used. Perhaps they removed the threads when they were testing or perhaps the guy who had it before me???
    How hard would it be to switch out the pulley shaft and how would I get one??

    I has a manufacturing tag as follows:

    The ASSY number EA-17265-5
    S/N 22128
    Production date 4-2-92
    Last edited by WLF; 01-14-2004 at 02:15 PM.

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