what the hell is up with that stuff? pettit racing says you should put 4 oz in every tank you put in the car....ive never even heard of people doing this, and pettit is a very reputable tuner/racer/etc i noticed this when reading their reccomended reliability mod list, and thought it was very strange. i assume it is a complete waste of money since this is the first i have heard of it, except for FB owners dumping 2 stroke engine oil into their tanks because their OMP's are busted.

 

A lot of us put Marvel Mystery Oil in regularly. I seriously think that the stuff Pettit uses is just re-labled MMO....looks and smells the same.
It doesn't hurt a thing and is just a bit of added lubrication for the seals...so why not?

 

The Pettit stuff isn't MMO (it's significantly thicker)... it's a synthetic 2-stroke oil, made by Lucas I believe. MMO isn't 2-stroke oil AFAIK.

 

ive heard that anything other than 2 stroke oil is nto good to put into your tank. how many ounces of mmo do you put in your tank? and how often?


also what is seafoam and why do people put it in their engine oil?

 

most of us stand alone ecu guys are required to use a premix. Our ecus do not know how to run the OMP. I usually run around 1 oz of castrol 2 stroke oil to every gallon of gas i use. gives it a 1:128 oil to gas ratio.

 

MMO?!? lol! sorry...

try TCW3 spec 2 cycle oil... it's actually made to be dissolved in gasoline for lubrication. and by made for it i mean they don't just say you can do it on the back of a snake oil bottle.

why do people put seafoam in their oil? regularly? i have no clue... if you change frequently enough you don't need extra detergent and the last time i checked lubricant doesn't need it's own lubricant.

i hope this thread isn't going where i just steered it...

 

holy **** 20oz per tank of gas?

 

^ yeah, if you aren't using a metering oil pump then you have to pre-mix at this ratio.

As far as other oil additives it is true you have to be careful. But MMO is just...awesome...stuff. It has been around for decades and has proven qualities. You can put it in your gas and in your oil and it just works wonders.

Plus it is kind of like KLOTZ two-stroke oil....it smells SO good when it burns!

 

I'm just curious, I have a Power FC and I don't use any premix. Does the PFC run the OMP? Or should I be running a premix in my gas as well?

 

Yes and not if you have a functioning OMP. Some do just for a little extra protection, particularly if run hard.

 

search for "premix" and you'll find out a ton of people use it. the minority, mainly people who don't know any better use MMO.

 

I don't believe MMO is meant to aid lubrication and sealing of the apex seals. That's for 2 cycle oil pre-mix or your OMP to handle. IIRC, it's advertised purpose is to minimize carbon deposits in the combustion chamber along with cleaning the fuel system.

 

http://www.rotaryaviation.com/oil_in...p_adaptors.htm

this will help

 

The PFC controls the OMP.

 

Never said to use it as a pre-mix, only that it was good stuff. Obviously if you don't have a functioning OMP then you definitely need to use a good two-stroke oil.

I wonder if anyone has ever used KLOTZ in their rotary? Now THAT would be 'sweet'....lol!

 

I'm a newbie to rx7's but I've notice a lot of topics have been discussed about lubrication. Maybe some of you has it right but most of you throw that word around like you know what it is...

I study friction, or tribology, for my graduate research so I know ma sh&t. Any small smount of additive, say 128:1, will not change the lubricative characteristics of a fluid. Generally, viscosity determines the amount of lubricatioin at a certain rubbing speed (shear rate) and applied normal load (stress). Notice oil lubricates well at low rubbing speed but water can lubricates just as well at high speeds, with the same applied load of course. Unless this stuff is really thick or viscous, I dont believe it adds any lubricative improvement to gasoline. And gasoline are suppose to be vaporized and combusted in the chamber so it's not even meant to lubricate anything..

By the measure of lubrication, I'm talkin about reducing wear, and not the frictional force... google "stribeck curve" for those who are more interested in this..

hope this help....

 

My recent engine tear-down showed minimal carbon build-up and no oil-related damage. I've yet to see a shred of evidence that premix or "fuel additives" do anything for smoother running or less engine wear.

To me, this whole deal is a waste of time and money. For some reason, FD owners seem to come up with **** to make living with this car more difficult. I think a vast cross-section of FD owners should go to therapy for masochism issues....

 

luey,there is a flaw in your logic somewhere......

Look at any 2-stroke motorcycle that has auto-lubing. The system is set up to run as little as 125:1 all the way up to 20:1 at wide open throttle.

Or look at nitromethane R/C engines that run very low percentages of oil, either castor or synthetic in the fuel.

 

Does'nt adding oil to the fuel, decrease octane?

 

LOL! So true, so true.

 

And your certain that's significant for everyone else?
It seems like your drawing alot of conclusions from one engine. I remember pictures of other engines (at least one that had been tracked regularly) that did have significant carbon deposits. State of tune, mileage, mods, driving habits, fuel quality, maintanence and a host of other variables that would influence that condition. Probably why there will probably never been any conclusive evidence for/or against MMO or anything else.
For the record, I use Chevron Fuel system/injector cleaner once or twice a year. Nothing else. But eh, to each his own.

 

Ha, I'll probably start some flaming. But I completely quit using Yamalube in every tank of gas and swithced my oil from Castrol 10w-30 to Castrol Syntec Blend 10w-30 and I will also be adding injector cleaner about 2 to 3 times a year. Guess my FD is headed for the s**ter!

 

How would temperature/heat factor in? Does that affect shear strength? And would fuel vaporize the same as oil? I ask because I thought the OMP oil was also meant to aid in sealing for combustion as well as lubricate, though I don't remember at what ratio it functions. And these are questions, not a challenge. I was just a undergrad back in the day and don't know.

 

Luey, don't take this the wrong way but doing math on paper is much different than working with the aspects you are speaking of. as i mentioned earlier i tore down my engine that has been premixed it's whole life and i simply wiped down the rotors with a shop rag and reinstalled them, that is how clean they were. i spend my time tearing apart and rebuilding engines, i see stock systems, premixed systems and failed systems so they are all comparative.

there is tons of proof that premixing helps these engines, though the OMP system works just fine for stock applications premixing is recommended for high HP applications since it lubricates everything inside the combustion chamber evenly.

to those who use MMO, it may work but it definitely does not protect nearly as well as 2 stroke oil does due to it's viscosity and protection values.

you certainly do not have to use expensive 2 stroke oil, i buy my oil at wal mart for $7 a gallon and add 1 ounce per gallon for an approx 300RWHP engine.

 

what I say was not logic, it's science. I have no prove that fuel additive has any effect or no effect at all but it sure isn't for lubrication. I really dont even know what kind of property it has. It may help the engine in other ways but lubrication was definitely threw in there for marketing purposes (sorta like how they say coolant lubricates the water pump) You can't lubricate with fuel/oil mix vapor, ever!!! (not in a car engine)


Heat reduces the viscosity of liquids and increase viscosity of vapor/gas. Shear strength? for metal you mean? It reduces the strength of any solid, making it softer. Depending on the vapor pressure of oil and gas, they vaporize differently. Gas vaporize at a lower temp. i believe.


One thing I know reducing carbon built up is from driving long trips where prolong complete combustion can burn it off. The startup is also smoother the next time car starts....