Engine sizes

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May 8, 2020 | 08:56 PM

CrzyDrvr

Thread Starter

Stage I

Joined: Apr 2016

Posts: 1

Likes: 0

From: Minneapolis, MN

Engine sizes

So I have a 2003 FLSTC roller frame. Now I'm wondering what will actually fit inside that. What about newer drivelines from 2015 and up from bigger bikes like Electras or Ultras? Hoping to be able to fit at least a 107 or bigger.
This would be my first time getting into an engine build/swap, and any pointers would be helpful! Not even sure what questions to ask right now, but I'm sure they'll come as I get going! LoL
For now I guess what I'm looking for is a place to start and the right direction...

Thanks all!

May 9, 2020 | 11:51 AM

hattitude

Seasoned HDF Member

Joined: Sep 2008

Posts: 14,143

Likes: 11,212

From: San Diego, CA

Quote:

Originally Posted by CrzyDrvr

Obviously, anything can fit into anywhere.... all it takes is time and money...!!

BUT...

Softail frames of that vintage used 88" "B" engines, with internal balancers, and mated to a 5 speed trans.... the Touring bikes used an "A" engine, no internal balancer. The touring engines are mounted into a different frame with different mounts, and have different engine/trans interfaces...

The easiest swap would be an early twin cam 88" "B" engine and 5 speed trans.... you can always get one that has been modified to your liking, or buy a high mileage version and rebuild to your preferences/specs...

The combos that can bolt-in or be used with minimal modifications, will probably be based on the OEM twin cam displacements: 88", 96", & 103". I suspect you will be best suited with a "B" engine and softail trans, but I'm not well versed on what is the same as what... I am sure some are bolt-in, or slight modification needed, up to "no way" it will fit without major modification...

Others will surely chime in..

Good luck with your project...

Last edited by hattitude; May 9, 2020 at 11:53 AM.

May 9, 2020 | 12:05 PM

Buddha4

Road Warrior

Joined: Oct 2006

Posts: 1,354

Likes: 13

The biggest B motor that I have seen without mods is a 131. have a Jim's 131 in my 03 . absolutely great motor went with a Thundermax Tuner specifically for that motor from Zippers, Get better MPG than with a 95ci carbed. Have a Baker DD6 and switched over to chain drive. Put an "older motor" instead of trying to fab all new mounts. Friends and the RG 114 and 114 SG. 2up have no problems with spirited rides.