Dear All

I realise trying to get information on the Avcon 180/CS conversion out of the STC holder is next to (or actually) impossible.

Does anyone know if the correct shock mounts for this conversion are 4 off Lord J-3804-28?
Or better still, have a parts list or engine mod drawing for this STC.

My engineer tells me that later OEM Cessna 172s (Cutlass, 172R & S) specify two different sets of mounts arranged diagonally to compensate for the increased torque. The Avcon conversion uses a fabricated engine mount which I suspect already takes account of this??

My aeroplane flies slow with wildly different incidences on each wing (adjusted on the rear spar bushings) along with a drooped flap, and I wonder if this might be because some turkey has installed different shock mounts at the last engine overhaul and changed the thrust vector?

I have the drawing and parts list for the related STC SA806CE covering the C170 and early C172 fastbacks.

Thank you

I have the Del Aire STC for my 170. It specifies 4 x Lord J3084-28

I’ve got the STC SA807CE on my C172B. It calls for a 17201-1 engine mount for models B-H, and 4- J3804-28 Lord mounts.

JumpingJack wrote:I’ve got the STC SA807CE on my C172B. It calls for a 17201-1 engine mount for models B-H, and 4- J3804-28 Lord mounts.

Thank-you very much Jack

Out of curiosity, what is slow? Mine flies at about 130 mph at 23" and 2300 rpm, with a Sportsman STOL and stock gear. At those settings I seem to burn a little more than ten gallons per hour. I didn't notice any reduction in speed with the installation of the STOL kit. Curious what others get for speed with this engine/prop.