Register

If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Results 1 to 4 of 4

  1. #1
    TampaRC's Avatar
    Join Date
    Apr 2012
    Location
    , FL
    Posts
    130
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    Whats the diff between a medalion crank and a td crank?

    Are they interchangeable at all?

  2. #2

    Join Date
    Jul 2005
    Location
    Upper HuttWellington, NEW ZEALAND
    Posts
    1,393
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Whats the diff between a medalion crank and a td crank?

    Yes-the external physical dimensions are the same-the porting arrangement is different. The TD has a large rectangular valve port, the Medallion a circular one of significantly smaller area. You can interchange them, but there will be some effect on performance either plus or negative, depending on which way you go. The difference in performance between a TD and a Medallion is not just the crankshaft-the two engines use different cylinders, different heads and different carb setups-and all of these differences have some effect on performance.

    ChrisM
    'ffkiwi'

  3. #3

    Join Date
    Apr 2002
    Location
    Collierville, TN
    Posts
    2,730
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Whats the diff between a medalion crank and a td crank?

    Yes & no actually, depending on the year of manufacture if memory serves.

    I used Medallion cranks in my "big prop" TD's some years back. I'd have to drag one down off the wall & strip it down to report the exact difference but I think it was in the prop driver to crankcase nose clearance area.

    Some cranks drop right in to a TD, others require a matching Medallion crankcase. It may have been some of the old stuff I was working with at the time though. My being a lifetime Cox engine piddler gives me some fairly ancient parts to play around with.
    \"He who dies with the most good Cox engines wins!\"

  4. #4

    Join Date
    Jul 2005
    Location
    Upper HuttWellington, NEW ZEALAND
    Posts
    1,393
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Whats the diff between a medalion crank and a td crank?

    I must have been lucky then-I've never had any issues-and I've done it with 049, 09 and 15 Medallions-normally replacing a Medallion crank with a TD one as part of a 'rebuild' which essentially made TD's from Medallions by replacing the appropriate parts. [For a period-late 70's-mid 80s TDs were hard to find in NZ-but there were 'parts set' Medallions -essentially the whole bottom end of the engine available from time to time-so by adding a TD cylinder and head you got something with more power than a Medallion-but less than a TD. Then as I randomly acquired other bits, shafts etc, the bottom end got upgraded to TD specs]
    ....probably about a third of my existing TD 049/09/15 fleet were produced in this fashion.....

    ChrisM
    'ffkiwi'


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -6. The time now is 09:42 PM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.