Originally Posted by
apereira
Dave,
Here is a picture (the best I could do at the moment) of the pistons, the one on top is on the 175 pump, 170 on thebottom, it has a taper on top and the lubrication groves are bigger , I guess with better lubrication it should last longer.
The pump internally pretty much remains the same.
I hope this helps and is what you wanted to see.
Regards
Alejandro
Alejandro......
Thanks a lot for your efforts to answer the pump piston question.
I had hoped that YS had installed a cylinder liner of harder material than aluminum.
I am somewhat surprised that it lasts as long as it does with a steel piston.
This might be a good reason to avoid low oil content fuel and perhaps add a small amount of castor.
My airplane has limited space in the engine area even for the 170.
Also, I hope the 185 has the same mounting hole spacing.?
Is the 185 larger externally than the 170?
Dave