if you use the sohn like 9k, then yes syn is the way to go in a renesis but if you do not have the omp blocked then you should be using conventional..... a little reminder, that with a high viscosity, the oil is thicker, takes longer to bring to op temp and to cool and can lead to pressure drops

 

I am planning on the sohn w/ syn and am pretty dilligent about warm up and cool down so hopfully I will "ok".

that sounds like a pretty neat class!

 

I call ya this evening to pick it up... going to go after it this saturday... thx...

 

I still don't see why it would matter, if the flashpoint is the same and dino... The main issue back int he day was the synthetic eating up the oil control ring seals. But these days all cars come with seals that are better suited for synthetic oils.

 

Yeah how the oil burns seems like a non issue, I think the thought process was that synthetics may leave behind more deposits when burned and gunk up or eat up the seals but a lot this talk was never really based on any real findings. There is no doubt synthetic is better, but who knows why Mazda recommends against it. My personal uneducated opinion is that they just did not want to bother with the cost of doing any real testing on the subject.

 

just look at wtb's use of royal purple.... he has gone through so many engines.... with what the engineer explain and my understanding, the internal combustion temp does not get high enough in the rotary to completely burn off the syn oil, leading to more carbon build up and a sludge to be left behind inside the housing, and possibly going out the exhaust port to your exhaust components....

this is just my opinion, you can take it for what its worth

 

Yea I'm gonna throw that under operator error category. lol.

We wont really be able to find out anything until we crack open an engine using only synthetic.

Just from what Ive been looking at all day I'm going to make the switch to from 10/30 gtx to 10/30 gtx syn blend. Still not sold on mobil 1 yet...

 

EGT's are in the 1600-1700F range at the rear O2, so I'd imagine that they are much higher in the housings. I can't believe that is not enough to burn it off if the flashpoint is in the 350-400F range. But of course this is just my uneducated logic As for what is left behind I don't know. I guess it's time to light some oil on fire.

 

3000+ *

 

if that is the case.... why is there still unburnt fuel in the combustion chamber

 

Good point. I am guessing misfires happen randomly and the fuel is not lit but sent out the exhaust port. But then that means the temps inside the housing are not that hot then..........

Hmmmm, the oil may remain in the chamber, also unburnt and that is how build up happens. I need to read more.

 

The autoignition temperature of Gasoline is listed as 536F. Seems to me that if it was not ignited by the plugs it should light anyway.

I'm gonna borrow a shrink ray and send some noob into my engine to get readings.

 

Excellent plan!!!

Also I'm pretty sure all the gasses aren't allowed to escape, since its fairly quick process. Whatever is leftover sticks itself to the rotor as it compresses for the intake stroke. Then gets super cooled with the A/F mixture, making it a much harder solid that it was originally in liquid form.

That's really just a guess though, I dunno what really happens in there.

 

if the rotor is sealing properly, the psi in the combustion cycle would be high enough to push all the gases out the export port

 

one thing to consider is the chamber temp may be "hot as hell" but that doesnt mean the surface of the housing/rotor is that temp (thermal conductivity). If that doesnt make sense I will try to explain a different way when I get home from work.

 

Makes sense, the suspended gasses maybe he but the surface will not be as hot due to the engine coolant doing its job.

 

exactly...again just my unedumacated opinion.

 

the first glimpse will be 9k's I am sure

and thats what I am thinking I will use 10/30syn...just not sure if I can bite the 0/40 that you use 9k

 

if only we could see inside the engine while is running!

 

man if engineered right you could have glass housings....that would beat a glowing trubo anyday

 

Wouldn't the rich AFR naturally result in unburnt fuel? Unless there's enough oxygen, combustion of the fuel will stop.

 

came across this pic in my photobucket... my old WB LOL

 

I still think its funny that the SARX sticker was still on there after you sold it, .

 

that was presarx

 

found this one of my bro's car for Shady...



jay rember this one?