1st engine with 856 hours had stock Mazda oil seal O-rings.
Last 800 hours
was on Mobile1 synthetic. No problems.
Current engine is at about 450 hours (all on Mobile1) and O-
rings are
whatever Bruce Turrentine used (think he uses Viton). I still
have to drain
about 1/2 quart after ~ 50 hours due to 2 stroke & MMO oil
mixed in fuel
being recovered off the walls of side housings.
Neither engine has ever smoked on startup except for the first
engine before
I overhauled it (prior to first flight). I ALWAYS carefully
observe the 210
F oil temp redline (measured at engine inlet) and reduce
power setting if
it is reached. If your oil cooling system is working properly
it is easy to
stay under 210. Summertime oil temp at cruise is around 180
F. Will reach
redline in full power climb if air temp is over 92F.
Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com
Tracy,
What ratio of 2 stroke to MM oil are you currently
using?
Kelly Troyer
Dave Garber used AMSOIL in his push/pull
racer, Virg
Here is some information from Racing Beat's web site on Synthetics.
I haven't priced Mobile uno or any other synthetics but their price for 10w30 is 5 bucks a qt.
Royce
[Image]
Royal Purple Synthetic Lubricants 10W30 Street (per qt)
Racing Beat has been recommending the use of synthetic oils in rotary applications for several years. Our research has found that synthetic oils provide superior friction reducing between sliding surfaces, reduced foaming, and lower oil temperatures. We have tested several different synthetic oils and have found that while most offered improved wear and lower oil temperatures, none offered any horsepower gains... except for Royal Purple!
Our in-house testing has yielded up to a 2% performance increase after changing from mineral-based oil to Royal Purple Synthetic Motor Oil. How could this be? Jim Mederer, co-founder and chief engineer at Racing Beat, was truly puzzled. With over 35 years of professional racing experience under his belt, he has seen and tried just about every ?new? lubricant that hits the market. All offered better wear and lower oil temperatures but none offered any horsepower improvement. After spending time consulting with the engineers at Royal Purple to better understand the reason for the horsepower gain, it was explained that the secret was the proprietary ingredient ?Synerlec?. This Synerlec ingredient provides an ultra-slick film on internal engine components to significantly reduce power-robbing friction. Less friction equals more power!
Other professional engine builders have confirmed that Royal Purple Synthetic Racing Oil delivers measurable horsepower gains. Independent dyno tests show increases up to 5% (on smaller displacement engines) with nothing more than an oil change.
Give Royal Purple a try with your next oil change!
I have been running Mobil 1 in my 1983 RX7 (only 66K miles) and it
barely passed the CA smog hc test yesterday. I think the catalyst is getting
contaminated. I'll change the oil and run regular motor oil and
get it re tested in awhile and see if that is the problem.
Catalyst will recover to a certain extent if you run them hard.
Of course my oil O-rings could have rotted in 20 years as well.
It does smoke a bit when I start it up.
Paul Lamar
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