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Hello!
This is a question for a project that is a little more JockeyJournal than AMCA but I'm hoping that some of the detailed knowledge here will help me out.
I'm currently in the process of building a 1953 Panhead Motor that is going into a chopped up frame (beyond being worth bringing back to stock). In taking some measurements I've found that the drop from the rear motor mount to the front motor mount is 1 19/32" which after measuring forum member chopsickles 47 knuck frame have determined to be the drop for a knucklehead frame and not the 2" found on Pan frames.
I have done some extensive measurements between a friends Pan frame and my frame but have yet to come up with where the dimensional difference is between the two frames is that would cause the difference in drops.
As best as I can tell, between panhead and knucklhead:
-front motor mount casting is the same
-rear motor mount casting is the same
-Distance between the top of the rear motor mount and the bottom of the seat tube is the same
-Distance between the top of the rear motor mount and the top of the seat tube is the same
-The front motor mount is about 1/4" closer to the rear (along with 13/32nds higher)
-The seat tube appears to be the same angle from level
-Down tubes and cradle appear to have the same lengths and degree bends
Most of these measurements were taken with a tape measure, straight edge and a angle finder so I may have missed something here.
Any help would be greatly appreciated and hopefully it'll put me on track to still have the bike ready for Daytona in the spring time where I can buy any AMCA member who helps and is there beer or two!
This is a question for a project that is a little more JockeyJournal than AMCA but I'm hoping that some of the detailed knowledge here will help me out.
I'm currently in the process of building a 1953 Panhead Motor that is going into a chopped up frame (beyond being worth bringing back to stock). In taking some measurements I've found that the drop from the rear motor mount to the front motor mount is 1 19/32" which after measuring forum member chopsickles 47 knuck frame have determined to be the drop for a knucklehead frame and not the 2" found on Pan frames.
I have done some extensive measurements between a friends Pan frame and my frame but have yet to come up with where the dimensional difference is between the two frames is that would cause the difference in drops.
As best as I can tell, between panhead and knucklhead:
-front motor mount casting is the same
-rear motor mount casting is the same
-Distance between the top of the rear motor mount and the bottom of the seat tube is the same
-Distance between the top of the rear motor mount and the top of the seat tube is the same
-The front motor mount is about 1/4" closer to the rear (along with 13/32nds higher)
-The seat tube appears to be the same angle from level
-Down tubes and cradle appear to have the same lengths and degree bends
Most of these measurements were taken with a tape measure, straight edge and a angle finder so I may have missed something here.
Any help would be greatly appreciated and hopefully it'll put me on track to still have the bike ready for Daytona in the spring time where I can buy any AMCA member who helps and is there beer or two!
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