is this guy talking about? Remember i am an RX7 newbee, but it seems to me like this guy is saying RX7's are like 2-strokes?

 

If you don't do a proper turbo setup and you run a cheap setup that lacks in fuel or whatever it is very easy to blow your engine.
If you build a proper engine and you don't go to high with boost unless you have mods that allow you to then you should be cool.
I run premix myself because I don't trust my oil metering pump and because I am a control freak when it comes to my car. A lot of people still use the stock setup and don't have a problem with it.

 

that guy doesnt know what hes talking about with rotaries
however Rotary Engines are similar to 2stroke engines... in ways.

2cycle engines require Oil to be in the fuel to lubercate the seals inside of the combustion chamber... On 4stroke pistion engines they usualy have Oil Injectors around the crank and sometimes in the cylinders.

Ive heard that Premix is good for modded engines, but for a stock engine a Mechanical OMP from an S4 will work fine... but you could premix alittle for good measure and security... if that OMP goes itll kill your engine...

 

Well, i originaly bought the car for a SBC swap, but didnt know the car was running/driving. So i figure it wont really bother me if i do blow the engine OBVIOUSLY i would rather not, just saying I wouldnt kill myself if it blew. I was planning to just "slap on" a turbo, FMIC and some good injectors and see what would happen. Any ideas what kind of boost would be safe for a stock 13B?

 

As far as the OMP failing and suddenly "blowing your motor", it's not going to happen that quick. If you continuously run it with no OMP then yes goodbye motor. I forgot to hook up the linkage from the TB to the OMP and all that happened is I lost compression at high RPM's. I thought I blew my motor. I went home connected the linkage and haven't had trouble since.

 

First of all, they are NOT like 2-strokes in the technical sense of the word, since the term "2-stroke" implies just two, distinct engine cycles from start to finish.
The rotary engine does go through 4 cycles, just like most piston engines - intake, compression, ignition, exhaust.

Second, the idiots who do mention 2-strokes is because of the engine power output versus displacement comparision.
The 13B rotary engine is typically described as "1.3 liters of displacement", but this is confusing.
Using the standard for which piston engines are measure in terms of displacement, you cannot do a direct comparison with a rotary engine - the displacement is calculated as TWO complete rotations of the CRANKSHAFT.
You just cannot do this with a rotary engine.
If you try, you either get a x1.5 or x2 factor, which converts the 1.3 liters in 2.6 liters (on the high end).
Yes, the 13b does mimic what a 2.6 liter (6 cylinder) piston engine produces in terms of power...

Bottom line?
Stop listening to those idiots.


-Ted

 

I don't see anything in that quote that relates rotary engines to 2-strokes.

However, to answer your question, Wankel rotary engines are like 2-strokes because:
1) They fire all of their rated displacement for each revolution of the output shaft, while a 4-stroke piston engine only fires half. In racing events, rotary and 2-stroke piston engines receive a displacement modifier or weight penalty so that the more common 4-stroke piston engines can compete.
2) Oil is introduced into the intake charge to help lubricate the engine.

As for "reasons why high horsepower guys remove the oil injection", there are also reasons why they lock the gears, pin the motor, convert to a dry sump oil system, remove the air conditioning, convert to individual throttle bodies, lighten the flywheel, balance the rotating assembly, convert to a standalone EMS, etc., but I don't see what that has to do with the price of apex seals on the back streets of China. I think you will find that a race-prepared SBC or SBF doesn't have much in common with its stock counterpart, either. There is a reason why a NASCAR engine costs $80,000.