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[HD Street Performance]

These twin cam motors make noise is an accurate statement.

One root cause is the SE255 cam is very short duration in relation to the lift.
More contributers are:
The SE springs have high pressure but that is needed for the huge heavy intake valves
If synthetic oil is used this has a tendency to aerate (air captured in the oil, not seen with higher visc dino oils), lifters collapse and valvelash is introduced
Lower effective lift shortens valve events and traps heat in the heads which superheats oil, more lash problems

This is a vicious cycle

Solution
Switch to 50w oil and 20/50 conventional oil in the winter
Change the cam, an Andrews 32h makes a great replacement bolt-in and runs quiet
Headwork and spring change to beehives

Sidenote
I recently have tested the SE CVO110 heads stock brand new and the airflow is pathetic (very close to the same as the stock 96" head). I was very surprised because they look very robust and have large (too big) valves. These need some work to get them to be good performers. There is a lot more torque and power hidden in these motors than many are seeing and are accepting as the norm IMO.

[Hoist!]

These twin cam motors make noise is an accurate statement.

One root cause is the SE255 cam is very short duration in relation to the lift.
More contributers are:
The SE springs have high pressure but that is needed for the huge heavy intake valves
If synthetic oil is used this has a tendency to aerate (air captured in the oil, not seen with higher visc dino oils), lifters collapse and valvelash is introduced
Lower effective lift shortens valve events and traps heat in the heads which superheats oil, more lash problems

This is a vicious cycle

Solution
Switch to 50w oil and 20/50 conventional oil in the winter
Change the cam, an Andrews 32h makes a great replacement bolt-in and runs quiet
Headwork and spring change to beehives

Sidenote
I recently have tested the SE CVO110 heads stock brand new and the airflow is pathetic (very close to the same as the stock 96" head). I was very surprised because they look very robust and have large (too big) valves. These need some work to get them to be good performers. There is a lot more torque and power hidden in these motors than many are seeing and are accepting as the norm IMO.

Hmmm, wonder where we've heard these things before!!!

Hoist!

[HD Street Performance]

Hmmm, wonder where we've heard these things before!!!

Hoist!

This is a new view for me. It actually defies all of what I have been taught in tribology classes. I do trust the source and know that very extensive testing was done to arrive at this conclusion. My source Reggie Ronzello Sr, R&R cycle.

[kb]

The surprise is that sounds like a decent dealer!

I had my 08 SERK go in for 5000 mile service and my local dealer did the head gaskets at the same time. When I finally got to ride, I heard what sounded like valve train noise. It turned out to be the bolts that hold the air cleaner backing plate were never tightened properly WTF WTF.Doesn't anybody take pride in what they do anymore? KB

[miker]

No.....