Hey
modified my tune with a slightly richer AFR (moved from 14.6 to 13.8 and progressively to 12.5 at the extremes) in my PV.
Did an auto tune yesterday, which meant a lot of high sustained RPMs.
When I took her for a second ride, i noticed it sounded like the valve train was noiser than normal. Seems to ride fine..
I took a video, but a guy here said it sounded like ping or detonation - Curious as to your opinions
Figured making the AFR richer would do the opposite.


What say you, 'normal' valve noise, excess noise, or ping / knock / detonation

 

Sounds like top end ticking to me.... pinging typically only happens under load.

Did you try putting the previous tune back in?

__________________________________________________ ____
For ROCKOUT information & purchasing please click the LINKS below... For all Twin Cams and Evo Big Twins & Sporsters

 

I didnt yet, but your rock outs are in my ebay shopping cart already. have some leaking rocker gaskets I just need to man up and replace, so the rockouts are going in at the same time.
Just seemed louder than before.

 

My valve train is making the same noise, sounds more like squeaking to me. As if something is rubbing.

 

When you richen the Air Fuel Ratio it also increases the speed of the flame front, that may need less ignition timing.
When you auto Tune with a Power Vision it pulls 4 degrees of timing throughout the spark tables for safety at high loads

https://www.innovatemotorsports.com/resources/myths.php

The spark plug ignites the mixture and the fire starts burning. The speed of this flame front depends on the mixture,
this means how many air and fuel molecules are packed together in the combustion chamber.
The closer they are packed together in the same volume, the easier it is for the fire to jump from one set of molecules to the other.
The burning speed is also dependent on the air-fuel-ratio.
At about 12.5 to 13 air-fuel-ratio the mixture burns fastest.
A leaner mixture than 12.5 to 13 burns slower.
A richer mixture than 12.5 to 13 also burns slower.
That's why the maximum power mixture is at the fastest burn speed.

 

That sounds like valve train noise to me. As stated above, pinging typically happens under load and in my experience lacks the rhythmic regularity that I hear in your recording. Was the engine hot when you made this recording? If so, let it cool to room temp first, and take if for another spin, and see how it does. My top end ticks when hot, and I intend to tighten up the lash to about .140" to see if that resolves it.

 

well just since I keep getting updates to this thread, over a year later. : Update: I never did anything about it (other than rock its when I did my rocker gaskets) and it still runs fine. I did change the tune.
Yes, this was recorded after a very hot run.