Thought I would share what had been occupying me this winter. I decided to build a 120" engine for my 2006 Ultra Classic. The majority of what I have done to this 2006 engine applies to the 2007 and up Twin cams, this engine would also make a dandy Trike engine.
The old engine just about ready to be pulled.
Engine has been removed. Since the transmission is supported by both the engine and the swing arm it is necessary to support the front of the transmission with a ratchet strap.
The old 95" engine which made 104 hp and 100 ft/lb torque setting in the engine stand.
I opted to use the new Screamin Eagle cases that Harley started producing last July. They come with Timken inner cam bearings and SE lefty bearings on both sides. The cases have had the spigots bored for the bigger bore cylinders.
I sent the cases off to Dark Horse crank works to have them build me a 4 5/8 stroke crank plus do the timken conversion on the left side crank bearing. The crank is a work of art, it has been plugged and welded, balanced and equipped with their H beam connecting rods.
Just a handful of the parts for this build.
Installing the cylinder studs. You need a head bolt with a ball bearing dropped into it to install and torque the studs. These studs are the stock Harley studs, no need for Screamin Eagle studs. Figure on having a spare head bolt because you won't get the bearing out once finished.
Studs installed with tubing to protect the threads, the connecting rods have been cut loose and protected with some pipe insulation.
Continued next post.