Well, it had "rock" in the name. Sorry about that, but y'all were partners once, weren't you?

 

The slight ramp before the lift in a cam shaft is called the clearance ramp. Some searches imply it is for solid lifters and it is the amount of the static clearance.
Know with my experience which is limited to my 150 Jeep motor I overhauled. I measured everything very carefully. Noticed it on the cam shaft.

However, valves where carboned up, I replaced them and they were a little short. With no adjustment, three of them on get 1/2 turn into lifter before rocker arm torques. Sounded OK till it warm up and then taps. Only got worst. Going to lower rocker arm pedalstel block when I get around to it.

 

I found the same thing with AMSOIL. I hated the noice it caused enough to drain it after the first ride with it in. Just didn’t sound right, and I went back to the regular HD Dino oil, and it quieted down immediately.

I would guess a thicker oil would do even better.

 

just suggesting....are you sure you are not hearing a little ignition knock from too much timing ??? what tuner is being used ?? possible to retard the timing a couple degree's and retest ...??!!!
maybe a combination of timing and a oil change may help ..???!!!
we agree ...with the oil being use ... we never run any synthetic's, as we only run dino straight 60 here in the deep south ...
good luck ..

 

I'm not sure this is good practice, or bad practice, but, when I start hearing more engine noise, I know it's about time to change the oil. I've never really changed it by mileage, but by feel and sound. I did try Amsoil once, and found it noisy from the get-go. I've always used Mobil 1, and never had a consistent noise issue. I've always been taught that Dino oil is good, until it reaches temperatures above 250F. And then the sheer rating goes way down. I also wonder if the reduced noise, while using Dino oil, is from the baked on sludge. DAMN IT! Did we just turn this into another oil thread?

 

 

I'm using an FP3 tuner but I'm pretty confident it's not a timing issue. It's not a super aggressive cam so I don't see it being the issue.

I'm also pretty sure I picked up the noise before I touched the motor and right after the switch to Amsoil.

 

[QUOTE=Bafflingbs;18211256 DAMN IT! Did we just turn this into another oil thread? [/QUOTE]


Noooooo!!!!!

 

I, too, have a lot of top end noise. Been using 20W50 synthetic for the past 45K miles. I change all three holes every 5K miles with synthetic. Should I adjust the interval when I try the Spectro 25w60? Or stay at the 5K mile mark?

 

For the last three changes, I did it at 3,000 miles. However, the oil looked very good as far as color, so I am going 5,000 this time. HD runs dino oil for 5,000 on their bikes, so WTH.