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

FWIW, I heard that when changing to Royal Purple
that you should remove ALL traces of the original
oil from the system. Especially if going to Synthetic.
The reverse could also be true. It would form a
gummy substance and clog up oil passeges. This
may have changed as this is circa 1970's info.
New input appreciated, Virg

 
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