Having just installed the cooling shroud, I note that it has been deleted.
http://www.vansaircraft.com/public/service-rv12.htm
Update 46 10-26-2016
http://www.vansaircraft.com/public/service-rv12.htm
Update 46 10-26-2016
I have it cut out, fitted, clecoed and ready for fiberglass. Now I will remove it and fill the holes. A lot of time invested at this point, but if it's not needed there is no sense spending more time.
Folks ? here is my take on the issue.
Without knowing if there is a significant reason for Van?s decision like hot spots on the cylinders, ect, ?. I?m guessing the added benefit of having the cooling shroud versus the potential issues involved by Van?s requiring builders to remove the upper portion of the Rotax engine to install the shroud may have been a contributing factor in Van?s decision. Not to mention perhaps even behind the scenes Rotax warranty issues.
Cumulatively, there are many thousands of hours on RV-12?s with the cooling shroud in place without any adverse engine issues being reported that we are aware of ? so that is a known entity. That said, if I had the parts, I would install them.
Another thought comes to mind ? with the shroud off is there more of a potential for the rising heat from the cylinder fins to contribute to vapor lock at the carbs or fuel lines? ? especially after a short refueling stop or restroom break on hot days? I would think the shroud over the cylinders helps mitigate the negative effects of rising heat from the cylinders heating the fuel.
Interesting point regarding our "auto-gas preferred " engines...the cooling fairing being a heat shield below carb lines/bowls. Would like to hear from builders that haven't installed them who fly out of higher heat areas.
I also wonder what Synergy does in their serial production.
That is, if it's already installed, is there any reason to remove it?