Knock Retard question

[KEV21]

I have my KR set to take out 4 degrees during PE. I see it taking out .5 occasionally. Is this false KR?

Thanks in advance!

[Russ K]

.5* knock retard is nothing to worry about. All engines will have some knock retard.

Russ Kemp

[KEV21]

I'm not worried about it, I am just wondering why it only takes out .5 if it is sensing a knock, when I have it set to take out 4.

Thanks again!

[KEV21]

ttt...
Thanks again for any more input.

[Rob]

Do you have it set up as 4 degrees max retard?

[KEV21]

Yes. The "Maximum Knock Retard" chart is set to 4 degrees everywhere. This is why I was wondering if it senses knock at all, why it only take out .5, instead of the entire 4.

[Rob]

Because that's the max it will take. Basically it'll take out timing up to 4 degrees.

[KEV21]

I understand that 4 is the max it will take out, I was just wondering why it only took out .5.
Is .5 based on the level of knock that was sensed?

Thanks Rob.

[goatkart]

yes, .5 KR is calculated based on what the KR sensors detect to be going on... there are a couple tables that will determine how much and how quickly it does this..

[KEV21]

Thanks again. I found the table that controls the amount of timing that is subtracted in proportion to each knock detected.

"Knock Fast Attack Rate vs. RPM"