Fuel DOES NOT COOL, it delays the Theta PP and lowers the ICP. Hence a lower CHT. This is the wrong way to cool an engine.
Agree with Jabba on this one 100%.
Jabiru engines in their native installations run hot.
Many an owner / maintainer simply pumps in additional fuel in an attempt to "cool" the engine. It will take a lot of fuel to cool a cylinder; in fact you may cool the head but not the cylinder. In fact by pumping in extra fuel you run the risk of it going through in gobs and causing issues; this is an issue in aicraft that are un-cowled.
AIRFLOW is the only way to cool these AIR COOLED engines. Unless you are running a stupidly lean mixture and cooking your heads, adding fuel will NOT help.
A 120hp Jab engine should in theory be able to run at around 19 lph IF cooled properly with AIR.
I can definitively demonstrate to anyone that wants to watch, that fuel will NOT cool a Jabiru engine or at least not to any significant amount worth mentioning.
If owners weren't skimping on engine monitoring and took the time to listen to the factory and fit 8 or 12 senders for CHT & EGT and take notice of what they are telling them, then a significant proportion of these issues would have been nipped in the bud a long time ago.
There are owners at my airport too stingy to fit the required instrumentation and thus are hitting regular problems like valves burning out. At least with monitoring, mixtures could be adjusted accordingly to rectify the problem. Some would say that an owner shouldn't have to do this, however if you have the ability to fit such devices and rectify the problems, you would be crazy not to.