I need to find chemical equations for the processes that occur when a
vegetable oil undergoes combustion at high temperature in a diesel
engine (or more likely an environment simulating this).
It does not matter too much what the vegetable oil is, but preferably
it should be something not too obscure such as rapeseed oil or
sunflower oil.

I have found out that when vegetable oil is injected into the
combustion chamber, low molecular weight compounds form at the
periphery of the mixture (by thermal cracking I think) which are burnt
easily, while in the core polymerisation reactions occur leading to
high molecular weight compounds which linger for longer.
I have been unable to find any equations thus far for these processes however.

The only paper I found which had any reference to this but did not
provide any equations was an SAE paper by TW Ryan and M O Bagby
entitled: Identification of Chemical Changes Occurring During the
Transient Injection of Selected Vegetable Oils.