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Big flat into a 45 frame

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flathead1943

Posts: 53

Joined: Sat Jul 23, 2011 7:22 pm

Post Mon Feb 18, 2013 11:06 pm

Big flat into a 45 frame

Anyone ever put a UL -80 cube into a 45 frame ???
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X-WLCH

Posts: 111

Joined: Wed Apr 30, 2008 12:16 pm

Post Tue Feb 19, 2013 8:37 am

Re: Big flat into a 45 frame

Yes
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flathead1943

Posts: 53

Joined: Sat Jul 23, 2011 7:22 pm

Post Wed Feb 20, 2013 6:34 pm

Re: Big flat into a 45 frame

Was it worth it cost /labor how did it perform ? Did you go to a 4 speed tranny also ? Pushing my luck here but any pictures ? Thanks FRank
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45Brit

Posts: 1453

Joined: Tue Nov 27, 2007 2:29 am

Post Thu Feb 21, 2013 2:07 am

Re: Big flat into a 45 frame

I don't really follow the logic of this swap. The 45 transmission is its weak point and it isn't as though the 45" frame was ever regarded as a particularly good unit; it's heavy, and not particularly strong, needing additional bracing around the chain stays.

HD never used the design again, after all.

Chouts are different http://choutbreeders.blogspot.com/
Shoot, a man could have a good weekend in Dallas with all that stuff...
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Pa

Site Admin

Posts: 4776

Joined: Sun Mar 12, 2000 1:01 am

Location: Ohio USA

Post Thu Feb 21, 2013 11:02 am

Re: Big flat into a 45 frame

45Brit wrote:I don't really follow the logic of this swap. The 45 transmission is its weak point and it isn't as though the 45" frame was ever regarded as a particularly good unit; it's heavy, and not particularly strong, needing additional bracing around the chain stays.

HD never used the design again, after all.

Chouts are different http://choutbreeders.blogspot.com/


HD used that designed 45 frame from the early pre 41 two bolt transmission frame design up through the 1941-1952 Solo model frame and beyond through the 1973 Servicar frame. That is a lot of years to use the same geometric frame design. The only real difference between the Solo and Servicar frames was the rear section of the frame.
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45Brit

Posts: 1453

Joined: Tue Nov 27, 2007 2:29 am

Post Thu Feb 21, 2013 11:06 pm

Re: Big flat into a 45 frame

well, yes, but it was basically the same bike. The Big Twins used a completely different frame design. The Servicars are/were directly derived from the WL and kept in production long after their commercial life was over, through government contracts - BSA kept the M21 60cc single in production for the AA contract after discontinuing dealership supplies, and Triumph never even attempted to sell the TRW through dealers.

No other bike ever used a WL-style frame and transmission, whereas the Panhead/Shovelhead swing-arm frame is a direct derivative of the original 1936 Knucklehead frame, and the K series and Sportsters use a frame which follows a direct line of development.
Shoot, a man could have a good weekend in Dallas with all that stuff...
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barry

Posts: 301

Joined: Sat Oct 11, 2003 12:01 am

Location: wooster oh usa

Post Fri Feb 22, 2013 7:52 am

Re: Big flat into a 45 frame

if you really want a big flattie in a single downtube frame look at a vl frame. stronger and more room for the engine.
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Pa

Site Admin

Posts: 4776

Joined: Sun Mar 12, 2000 1:01 am

Location: Ohio USA

Post Fri Feb 22, 2013 9:02 am

Re: Big flat into a 45 frame

barry wrote:if you really want a big flattie in a single downtube frame look at a vl frame. stronger and more room for the engine.


Thanks for noting the VL frame Barry. I thought of it after logging off last night.
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45Brit

Posts: 1453

Joined: Tue Nov 27, 2007 2:29 am

Post Sat Feb 23, 2013 2:07 am

Re: Big flat into a 45 frame

There's a thread about a UL engine in a 45 frame in here dating from 2005
Shoot, a man could have a good weekend in Dallas with all that stuff...
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45Brit

Posts: 1453

Joined: Tue Nov 27, 2007 2:29 am

Post Sun Feb 24, 2013 1:45 am

Re: Big flat into a 45 frame

Been trying to access the old thread about this, can't access te pictures
Shoot, a man could have a good weekend in Dallas with all that stuff...
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knucklebolt

Posts: 255

Joined: Tue Feb 12, 2013 8:27 pm

Location: Six miles East of Cheney, Wa.

Post Tue Feb 26, 2013 9:42 pm

Re: Big flat into a 45 frame

That's funny I was wondering why someone hadn't put a big flat in one of the new-wave 45 frames that take the big twin tranny. I personally prefer a bike that's a bit longer, has double down tubes, and is not short and stubby, but I guess it would have some "wow" factor or hot rod appeal for those that like that sort of thing.

Shouldn't be hard to do with some welding and el-heato-bendo. Or not. :roll:

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