A recent discussion on the forum asked whether oil injected into the fuel finds it's way into the crankcase oil. As best I can tell, rotary engineers think this is impossible, since the rotary engine is not designed to do this, and rotary mechanics figure there must be something broken that needs fixing. However some of us rotary drivers who add oil or MMO to our fuel in our nicely running RX-7s are finding our engine oil rising and are wondering why. In the course of this discussion, someone (I can't remember who, sorry) suggested that I sniff my dip stick. So tonight when I got home, I did sniff my dip stick and sure enough, it smells like MMO. So if you add MMO to your fuel, you might want to give this a try.

Ray

 

mine smells like tuna.

 

Hmmmm, Ill have to give it a try when my Fiance best back with my car.

 

Just a few questions... what ratio are you pre-mixing and are you still running the metering pump?

 

Mine tastes normal.

 

Still don't know why someone would disable a perfectly working OMP...

Dan

 

Mine smells like gas....

 

ditto.

 

mine smells like spaghetti.......oh wait that's my finger.....ok it smells like someone took mmo and coated my oil in it then spilled gas on it and then ate spaghetti for dinner.....that's just my finger again...anyways mine smells like oil i guess.....clean castrol gtx....ah tastes a bit like spaghetti though....damn finger!

 

That would be me.

Both of my currently running engines' dipsticks smell like gas. I'm sure when I get my other engines rebuilt, they'll be a little worse because they're going to be street ported. Ported engines have a higher occurrence of gas dilution. This means either a heavier oil should be used, and/or it should be changed more often.

 

REVHED, I'm mixing 8 oz per 16 gal fill up with the OMP hooked up and working normally. The oil level doesn't really rise, it just doesn't go down anymore since I started adding the MMO.

My purpose with this post is to add a little comic relief, we pretty much beat this horse to a pulp in the earlier posts. Jeff, the dip stick sniffer, resolved the issue by pointing out that a certain amount of blow by (or leaking or whatever, I still don't quite understand exactly how it gets there) of the combustion gasses into the crank case is normal for rotaries.

So now, along with pouring red colored fluids into our gas tanks, we must also suffer the embarassment of being seen sniffing our dip sticks in public. Ah, the pleasures of driving a rotary.

 

I can't sbell bide.
By doze is all plugged up.

 

It would be innevitable. Since the intake is side ported when the intake stroke is complete there is still fuel being drawn down through the manifold. The gas will get under the side seals and down to the oil seals and seep through (gas being lighter than oil) and into the oil system. My SE was extremely bad when the injectors were stuck open (obviously had flooding probls too). My 12A smells of gas too. Too much would be a concern, I guess if you can light it with a smoke you should worry.