Originally Posted by
bjr_93tz
Hi Naftali, I was just about to ask that question of others this morning.
I've been running Coolpower blue at 10% which I believe is their standard viscosity.
I did run it at 20% for a couple of months when I first bought the engine, but I couldn't seem to get it running right all the time although the rest of the world had no problems running 20% oil. It was my first YS engine and I was on a steep learning curve (seems I still am) but it was easier (more idiot proof?) to tune on 10% oil.
While I was in the LHS, he pointed to a bottle of the Coolpower purple multi-viscosity oil and I was going to ask about that this morning.
I need a new bottle of oil and was wondering if the switch would be worth it and what percentage I should run?
I use Coolpower MV (purple).
When the DZ140 first came out, I was using the standard Coolpower blue oil. But for the DZ's, this was too thick and the red was too thin (not enough film strength), so I started to mix 50/50 blue and red. The MV purple is basically the same. As soon as the MV came out, I switched. The engines seem quite happy on this.
I've used various percentages over the years from 10% to 16% to 13% and now I'm using Raoicon pre mixed, which is 10% oil. I didn't notice any real difference in performance, just different tuning and less smoke trail with less oil.
Of course there will be more wear with less oil. The rear bearing is the main thing to keep an eye on. On 10%, I generally replace bearings after around 150 flights. Or if it's getting close to a big comp, I'll rebuild if it's at 120 or more. These are still the same bearings as in the original 140, so with props now up to 21" compared to 15 1/2" for the 140, the rear bearing cops a hiding.
It will be interesting to see if the 200 still uses the same bearings. The prop I have for the 200 is 21 1/2" diameter.