crankshafts

[Tattoo]

2011 Touring

Piston pin fit (loose) 0.0007-0.00012 (in)

Flywheels
Runout (shaft measured in case) 0.000 -0.010 (in)
Runout (measured in truing stand) 0.000-0.004 (in)

[Admiral Akbar]

I don't doubt that it makes for a very strong small end. I just wonder about long term wear.
Better run Synthetic 

Just as long as it ain't Royal Purple..   

Max

[Sonny S.]

Thanks Tattoo,

So that's the same as the 03 & up rods with bushings.
I think they are a ..replace at .002
...........time will tell .....

Max... nope...don't want that sludge   

[Tsani]

When did they change to the "Dickhead" rods? I haven't seen a pair yet. Are pistons tapered to fit? Weird deal.

[ultraswede]

The tapered small end (d... head) is common on diesel car engines. ( for example 295 ft lbs@ 1750 rpm = 74 ft lbs each piston.)
Its a great way of maximicing the combustion load-bearing surface of the crank pin,
and at the same time maximicing the strength of the piston,
if the piston has the corresponding shape in the pin bore section.

It might be a way to make cast pistons survive, where a forged piston might othervice be called for.
Cast pistons is always a better choice, if they survive the running conditions.

[Sonny S.]

I didn't think Harley came up with the idea on there own , so last night I did a little google searching and saw that VW, and even the Chevy LS9 are using a tapered rod. Chevy is using Titanium rods though. Both used bushing.

[EngineNut]

I believe the German engine component manufacture Mahle originated this rod design. Many manufactures, including Harley, use Mahle manufactured engine components.

Click on the image and read what Mahle says.

[wurk_truk]

The 120R has a full rod with bushing... not a dickhead rod.  If the dickhead and bushingless is so 'great'...  I wonder why SE didn't use it for the top engine?

[BVHOG]

Even some John Deere industrial engines have tapered rods.  Wurk, the 103 06 SE bikes were already using the tapered rods.

[wurk_truk]

But Jims pics of the 120r looked like a full rod???

[FSG]

When did they change to the "Dickhead" rods? I haven't seen a pair yet. Are pistons tapered to fit? Weird deal.

The appeared in 2007
  Twin Cam 96â,,¢  Connecting Rods and Pistons
• Lighter pistons    and connecting rods for lower reciprocating weight
• Shorter wrist pin

Refer Page 11 of the 2007 Model Year Technical Forum

[Tsani]

THX!

[barny7655]

Well all of us that have comp releases may be saved from the crank moving there halves, may be the electric comp releases hooked up through a brake pressure switch will activate the releases thus not causing lock up ,when brakes are applied in that stop we dont want to have , easy to do ,its just reversing the action of the solinode,and when brakes released the comp releases close , any way just a thought , just needs and pressure switch, high pressure,,only stops this side of the crank movement,does any one know what side of the crank that moves on the pin? we think only of the bare crank shaft, i seem to see the comp assembly on one side, with the alternator,the other running some what free with cam crank gear,so when it locks one would assumme that the left side is the one that gets miss placed on the pin,?please any one say what your ideas are on what side moves ,cheers Barny

[moose]

now thats thinking outside of the box

[Big Dan]

I don't think it would matter. In a "bad braking" situation the crank is stopped dead by the primary chain, via the rear wheel, through the clutch. A crank spinning at 3k rpm (or more) doesn't care what the compression is when it gets stopped dead by the primary chain.

[smoserx1]

 

I wonder if this is a good argument for anti-lock brakes?

[Dennis The Menace]

Maybe a jake brake, auto engaged on decel.  It would eliminate decel pop.  lol

[jsachs1]

Just got in 2 sets of wheels for 103" builds.Both had rod bushings,,,,,,,,,,The dealer just ordered them from the MoCo last week.
John

[Tattoo]

Just got in 2 sets of wheels for 103" builds.Both had rod bushings,,,,,,,,,,The dealer just ordered them from the MoCo last week.
John

Do you happen to have a part# for those flywheels?