Digging up the oil debate again!! - Two Stroke Stuff...

[Mike]

With all these threads on oil, be it mineral, synthetic, semi-synthetic, man-made, hydrocracked...

What are peoples thoughts on 2-stroke? I\'m using 2-stroke in my freshly rebuilt RX7 with a separate tank and modified pump for rotor seal lubrication as it burns cleanly, and hence using a \'well-known\' semi-synthetic (mineral based).

Am I doing the right thing? Or am I shortening the life of the engine??

Discuss....

Mike.

[Grizzly]

From experiance the 2 stroke mod works ok but after doing some serious reading up you\'ll find its putting too much in and its hard to turn it down enough, its also easyer to forget to keep it toped up and run it dry.

The best thing to do is run 2 stroke oil in the fuel, this way you can meter the Amount better and becouse of the way it is put into the Chamber in more Vapor type of Form it is a more effective method of providing the seals with some form of Lube (goes every where the Fuel does rather than being scraped of the housing by the center of the Apex)

[BlitzBoy]

PreMix is the way to go for good lube of the seals on a high power rotary, warped two sets of seals when relying on the stock OMP, now i have gone premix the car runs a lot smoother and no danger of warping now

[Grizzly]

I keep being told this, When there is High load on a Powerfull rotary and the Apex\'s are HOT!! your effectivly putting a lot cooler liquid into the center of it? Thats not good if you ask me, it makes one part cool quicker than the other so its bound to warp or Crack?

[Warthog]

I run Premix...:cool

[oldone]

Until proven otherwise,I will always run premix.......going on for 14 years now,still no probs..:cool

[Red and Single]

Premix here.....

[RemarkLima]

Surely if you run premix 2 stroke oil, then you can use a proper full synth oil, as the sump oil is no longer being combusted (the main argument for using mineral right?)?

So you can get all the benefits of running a decent synth for the turbo\'s and everything else, and should also mean the sump oil will remain effective longer... right?

[Bramble]

I run premix too.

[BlitzBoy]

Surely if you run premix 2 stroke oil, then you can use a proper full synth oil, as the sump oil is no longer being combusted (the main argument for using mineral right?)?

So you can get all the benefits of running a decent synth for the turbo\'s and everything else, and should also mean the sump oil will remain effective longer... right?

veryyyyyy good point!!

[Mike]

Surely if you run premix 2 stroke oil, then you can use a proper full synth oil, as the sump oil is no longer being combusted (the main argument for using mineral right?)?

So you can get all the benefits of running a decent synth for the turbo\'s and everything else, and should also mean the sump oil will remain effective longer... right?

:cheers
And this is what I am doing, which is why I posted - although not running premix.  The concern that crops up is around the use of synthetic (man-made) oil and its iteraction with the rubber oil seals, however I would have thought that as these have been replaced (on my engine, and all rebuilt ones out there) the material used is now more oil resistant (as in the RX8)?

I understand the points raised by Grizzly and Blitzboy, and agree strongly that a highly tuned rotary should (in my opinion) run premix, however on a standard or mildly tuned rotary the OMP should be OK to run 2-stroke as you only substituting sump oil for 2-stroke - the delivery is the same.

Mike.

[Dominic]

Mike,

There is a thread going on at the moment discussing this exact topic (see below). The thread started off talking about N/A rotors (thread named 13b N/A) but has evolved into a pre-mix/OMP debate. There is a link in the thread to ausrotary.com which describes the exact system you are using with the separate 2 stroke oil tank and modded OMP.

http://www.mazdarotaryclub.com/forums/showthread.php?t=28919

Cheers

Dom

[Grizzly]

Well i\'ve always sort of run pre mix on my more stock cars (Std ECU or Mild mods) i often put 2 stroke oil in the fuel as well as using the stock OMP. I know using Synthetic 2 stroke oil does\'nt drop your Octaine level and i\'ve never had a problem with it so thats what i do.

[Mike]

Thanks for the link Dom, great thread.

Mike.

[RemarkLima]

Does sounds like an interesting idea, so you can run decent synth in the sump!