There has been a lot of debate on the infopop site about the benefits of adjusting the injector timing to suit biodiesel. However, there doesn't seem to be any agreement on whether it should be advanced or retarded.
Biodiesel has a higher cetane number than petro which means it ignites more readily. This would seem to indicate that a few degrees of retardation is required to ensure that peak cylinder pressure isn't reached before top dead centre. Also, it's reported that NOx emissions are reduced by retarding the timing.
On the other hand, it's also stated that biodiesel has a longer burn time than petro, so requires advanced timing to keep the burning mixture in the cylinder for longer.
Does anyone on this Forum have any experience with adjusting injection timing to suit biodiesel? Any diesel technicians out there have any Dyno test data or impirical/anecdotal evidence one way or the other?
Biodiesel has a higher cetane number than petro which means it ignites more readily. This would seem to indicate that a few degrees of retardation is required to ensure that peak cylinder pressure isn't reached before top dead centre. Also, it's reported that NOx emissions are reduced by retarding the timing.
On the other hand, it's also stated that biodiesel has a longer burn time than petro, so requires advanced timing to keep the burning mixture in the cylinder for longer.
Does anyone on this Forum have any experience with adjusting injection timing to suit biodiesel? Any diesel technicians out there have any Dyno test data or impirical/anecdotal evidence one way or the other?
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