r****d

[Donny_Dog]

Yes, I have been called this in the past, but thats not the sole reason for this question.

When boosting an engine (thats not originally a turbo engine from the factory) I have seen that: retarding the ignition timing will keep the engine safe.

What does this mean? Why must the ignition be retarded - to keep it safe from what?

Is this the same when not running boost - but yet increasing horsepower from say... throttle bodies?

I don't understand.:S

 

[MartinR]

Awaits Chip

 

[Michael Woodford MST]

It stops DET which is a factor of heat and cylinder pressures being too high.

Your moving the spark towards TDC, in some cases after it!

 

[wrc172]

Essentially, you 'r****d' I.e. back off the ignition timing to fire slightly later. It helps combat pre ignition - I.e. detonation.

You can't just do it though, with old distributor days yes, not now - the car needs mapping to back the ingnition off.

 

[Donny_Dog]

Essentially, you 'r****d' I.e. back off the ignition timing to fire slightly later. It helps combat pre ignition - I.e. detonation.

You can't just do it though, with old distributor days yes, not now - the car needs mapping to back the ingnition off.

What about using adjustable pulleys?

 

[wrc172]

You could use cams, adjustable pulleys, turbo's, superchargers - whatever you want mate - the power all comes from the mapping. Gone are the 'rs turbo' days when you guessed the fueling and ignition....

Get it turbo's if you must - let the mapper sort the ignition.

 

[Jay_Kay]

Pulleys effect the timing of the cams which open the valves. Have nothing to do with ignition.

 

[Dan@SJM]

You can also alter the timing of the cams to reduce overlap as on a turbo motor you don't want it blowing the air/fuel mix straight back out the exhaust.

 

[Donny_Dog]

Good info, like my own wiki.
Cheers,