lighter duty crack support and lighter duty crank bearings

 First a round I'm hoping for a good discussion over this so lets get our
whistles wet.

Anyone have any more info on this. Something about Harley changed the design
of the case in all TC's after 2003 and took away one crank bearing then
cheapened the other two. The down fall as I remember is to much crank run
out for going to the gear change for the cams, and not enough support at the
crank to support a lot of torque.

The article was in www.americanbaggermag.com and a few issues old and I was
a tad lit up when I read it so I'm a bit rusty on what I read.
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Carl

I started out with nothing, and
I just about have that paid for.

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HD went from the double Timken on the output end of the crank to a plain
roller bearing, similar to the cam side. Crank run out had nothing to do
with the bearings, but many believe the newer bearing does not support the
crank as well causing the crank to slip at the crankpin, under hard
acceleration/deceleration, which results in more run out. Also in '05 the
Moco went from forged flywheels to cast flywheels. Both changes are said to
cause more crankshaft failures.

--
PoorUB
'05 Ultra Classic

 

First time I heard about the cast flywheels. Seems to me the Moco is doing
everything they can to keep us from building stronger engines. They just
keep going the wrong way IMHO.

I corrected my spelling too,,,,,,crack,,,,boy!!!!

--



Carl

I started out with nothing, and
I just about have that paid for.

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<snip>

    Pretty natural progression.  Start with something that will work & sell,
then refine it to meet your (the MOCO's) intended purpose at the least cost.
Remember, Harley has always built the big twin as a road bike not a drag racer,
or a sport bike.  They still claim they're sufficient for "legal" speeds bone
stock.
    The twin-cam is still a pretty beefy case, & by the time you go into
cracking the cases for upgrades it's not going to be much more money to change
bearings since you're probably changing the crank & flywheels anyway.  Of course
now it's being refined to meet your (the owner's) intended purpose.  A
completely different animal........& a different cost.  Horsepower is measured
in CUBIC DOLLARS.
    Have you noticed the number of people that just unbolt the stock motor &
bolt in something more powerful from S&S, Ultima, etc.?  Suppose they know
something?
-

Jinks ('86FXRS, '07 FLTR)
#64

 

measured

As I under stood the design change was to speed up assembly. As you
mentioned, they say it will do what they intend it to do.

I work for a company that puts a new product out, lets it get out and work
great the way it is, then decide they want to cut costs and do the very same
thing, puts a inferior design out compared to the way it was. Charge the
same but spend less to get it out the door. Were going through that issue
with a product right now. They changed the frame of a machine to lighten it
up, cost less to put out the door and now its twisting!!! I won't say who I
work for but I will say what I do. I build track and rubber tire trenchers.
I'm a sheet steel welder now building the shields and oil and fuel tanks. I
used to build the booms but my back couldn't take it anymore.
--



Carl

I started out with nothing, and
I just about have that paid for.

Remove one 9 to reply



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