Pinking/knock

[snotrag]

Heres a situation -

Quite high altitude (for this country anyway!)
Very warm air temperature
High engine load, sustained thrashing
Ignition timing advanced perhaps a little too far

This is an ideal recipe for inducing a bit of the tell tale pinking sound at really high load, is it not?

Or have I got things the wrong way round?

[Team 17]

snotrag said:

Heres a situation -

Quite high altitude (for this country anyway!)
Very warm air temperature
High engine load, sustained thrashing
Ignition timing advanced perhaps a little too far

This is an ideal recipe for inducing a bit of the tell tale pinking sound at really high load, is it not?

Or have I got things the wrong way round?

High compression ratio plus low quality fuel can also contribute.

[Superhoop]

It also depends heavily on what car it's on...

If it's a fairly modern car, it's likely to be fitted with both knock and baro sensors, which will prevent pinking from occuring...

The baro sensor works out how far you are above sea level, and trims the inition timing back to account for the lower percentage of oxygen in the air, and if pinking occurs it is detected by the knock sensor and the ECU retards the ignition timing accordingly