As Tom mentioned, Van's made a change to the exhaust system that moves the muffler further aft from the oil cooler. To be clear, changing over to the new muffler design not only requires a new muffler, but also replacement of the four exhaust pipes between the cylinders and muffler.
My RV-12 was one of the first kits shipped with the new muffler assembly and I have not seen excessive oil temps to be a big issue. However, here in Ohio, we are not subject to the summertime desert high temperatures you experience regularly. Living where you do, if I had the original exhaust system, I would seriously consider moving the oil cooler an inch forward before committing to the expense of a whole new exhaust system ... it may be all you need to do and it is inexpensive to try that first, compared to the cost of a whole new exhaust system.
RV-12 Wings, Empennage, Fuselage, Finishing, Avionics and Powerplant kits all completed
Dues paid until September 2018
Last edited by John-G : 05-08-2018 at 07:07 AM.