Mazdero

I do not have any pictures. I believe he said something like 3 or 4 pounds. It was a long time ago, I'd have to call him and Ask him for exact figures.

bald01

while subtracting weight from the car is good from some areas it is a BAD thing. The rotating mass is one thing that is very BAD!!! I took out the stock crank in my mustang and replaced it with one that was 10 pounds heavier with no extra stroke. result more torque and more horse power. granted throttle resp[once was lessened a little. but when I stomp on it passengers move their hand from their chest to the dashboard. In short ROTATING MASS IS POWER. So ask yourself. do you want power or throttle responce.

inanimate_object

That's the biggest load of bollox I have heard in quite a while.



Mark

zjbarra

Reducing the rotating mass will give you better response but make the car a little more trouble at getting off the line and probably wont idle all that great.



I have always hated it when people bust out the "Mazda knows best card" but quite frankly, Mazda has spent gobs of money doing research on the rotary engine and even though their agenda is slightly different than yours, they have done a lot of research in making it the way it is. Granted the safety factor on the rotors are a bit high since people are able to push extremely high amounts of horsepower on stock rotors but the fact of the matter is, they have done a lot of research and a lot of testing on this.



There are all sorts of things that factor in from an engineering standpoint that even with raw numbers will not always yield the results you'd expect. I don't know if you have any real experience with engineering design or anything along those lines but there is a reason why millions has been spent on this engine by mazda instead of them deciding they want lighter rotors and welding crap in place of the previous design.



Sorry to be a downer guys but I don't agree with this idea.

spooliNrx7

This might be true, but the actual temp of the rotor only reaches around 200-220, or whatever average temp is for the engine. The high temps you speak of would only be surface temperatures, and most likely not nearly that high. Would this still affect the rotor??

rfreeman27

So you are trying to say, that the face of the rotor never exceeds 220deg?



Exhaust gasses are hot!

zjbarra

Combustion engines are driven by pressure. The pressure is going to be heavily dependent on temperature. If the pressure of our engine durring combustion is 3x what it was at an equal volume previously, it is going to be about 3 times the temperature. Surface temps will be extremely high and the temperature will taper off towards the water supply (oil for the rotor itself) giving the overall piece a lower temp but it's not *** if the whole part needs to be at melting temp just for something to melt. If your rotor surface gets to the melting temp, it's going to melt and odds are it's going to see gobs of other problems.

spooliNrx7

No, I did not say that the surface tmp only reaches 220 degrees, I was saying that MOST of the rotor and housings are not going to see that high of temperatures, just the SURFACES. If the engine soaked up that kind of heat, you would overheating problems and thats when the warpage starts.

zjbarra

I will agree that the parts are not going to be at 1800 degrees through a huge part of them but our coolant is coming out and being registered at nearly 200 degrees after it goes through the engine. Even though it's not as effective as the heatsink the engine is still going to act a heatsink and the heat has to transfer through the housings to warm the water to this temeprature. One of the argument made for a products like Evans coolant is that it wont boil at the small micro scale at the engine's surface as easily.

G2G

Regardless of the surface temperature, the coefficients of thermal expansion for titanium vs aluminium are far apart. The coefficient of thermal expansion for titanium is 13.7e-6 and the the coefficient of thermal expansion for aluminium is 7.1e-6 (both per degree celcius). So you can see that titanium is almost twice that of aluminium. Which means that it will expand faster than aluminium. You don't want your rotor expanding faster than the housing. If you were to use a titanium rotor you would have to take this into account and have the reduce the size of the seals, while keeping the housing and epetroichoid the same dimensions. This means you would have a significant gap between the seals and the housings at lower temperatures.



- Hand