Forklaring på fortenning.

[makann]

Da jeg skrev denne ble den på engelsk, er lagt inn på amerikansk forum.

er fortsatt kjekt å kunne for å forstå tenningsprinsippet.

(når skal man sette fortenning?)

 

 

 

Retard timing means that the sparkplug fires later on the combustion stroke.

feks 26*BTDC, or before the piston has reached topdeadcenter.(of 360* one rpm)

 

 

advanced timing creates more cylinder pressure as the fire ignits early when the piston is on the way up to tdc, firing the fuelmix and start the combustion against the pistons movement.( Like kicking a ball when it rolls against you, hit correct, ball fly hard, hit late weak ball, hitt early miss ball )

advancing timing makes the pressure go up, and the torque will rise, to much will cause Knocking/detonation, that means your cyl pressure rices hugely, causing sleeeves to crack,, rods bend or brake, and pistons to crack/ get a nice hole.

 

as you retard ignition, the combustion will be moved further inn to the exhaust port.

 

a combustion last |--------| long, when rpm rises the combustion last the same it has only less time doing it, thats why timing is altered on 9000rpm vs idle (800-900rpm)

so to much retarding creates a lot of heat in the cylinder head, and can melt down valves in some occations.

 

ignition timing should be set, of what kinds of fuel you use, compression, how much boost etc.

 

proffesional tuners will lissen to your engine if its Knocking, when engine is beeing tuned up. (sorry if I have any language errors, try write this in Norwegian )