What's the matter with injecting sump oil?  It works,  it is reliable,  and
also what's the matter with the long term durability of Mazda engines
anyway. Current engines will go well over 250,000 miles between overhauls
if serviced correctly and not overly abused.  Use the correct high quality
synthetic engine oil (Mobil 1 is my favorite) and change it regularly and
you don't have a problem.

A separate system would be horrendously complex requiring a separate
reservoir and pump.  Just something else to go Wong.  I've never had a
satisfactory answer from anybody as to what is wrong with injecting sump
oil to lubricate the seals.  All piston engines lubricate the bores with
sump oil!  Why is a rotary any different??  (Think about it!)

Leon

Cause it burns and leaves carbon deposits that can and do stick the
apex seals. Two cycle oil is designed to burn cleanly and leave
no deposits.

Paul Lamar

marc wiese wrote:

Pauls got it hit on the head, as usual!
And I want to add that using Mobil 1 as an injection oil leaves the
"burning" of that type 4 stroke synthetic lube oil in question. It "may"
leave other residue, and has never been endorsed by Mazda. If you cut off
your oil injectors and do 2 cycle premix, by all means use Mobil 1 in the
pan (it helps if you have recently replaced your seals).

And the more recent high output turbo engines get NOWHERE near 250, 000
miles. 100,000 max is more like it for the 5 speeds, 60,000 for the
automatics (low rpm shifts and light usage low rpm driving promotes carbon
buildup). Then again it is only the carbon killing them if they are not
over-boosted. A disassemble and de-carbon gets em going again.
Marc

It always amazes me when I learn something new :-)

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org