I've been doing some research on rotary anatomy and it seems alcohol would be better for it in almost every single way, but there's one big problem that I could see with it. As the engine comes standard in the RX-7 it suffers a few problems: slow combustion, and fuel in the exhaust. Alcohol burns even slower than gas. The problem I see here is alcohol will not burn completely before it reaches the exhaust, more unburnt fuel will be in the exhaust. More fuel in the exhaust=higher egt. I am currently trying to lower the egt as much as I can and I want more fuel burnt in the combustion chamber, thus increase the thermal and power efficiency and maybe better fuel efficiency. So my first question here is my theory correct? I do see alcohol working in a Renesis engine though.

 

and this is why you add ignition lead in ( timing )

 

I know that, that's a given on any engine. My point is it's not perfect, it escapes. Unless alcohol allows more of a range to set spark timing, one that is effective at creating power and complete burn of fuel.

 

...but it does...
and EGT is much more than a simple function of the residual heat energy of late burning gasses .. though that may be most true on LPG or NG vapour fuelled engines

there is quotients that include the the ambient temperature and the latent heat of vapourization of the blend concerned
and so its effect the inlet temperature

then the AFR ratio and the amount of quench provided by the fuel/s at the outer regions of the chamber
and the ignition timing

all combine to have effect on exhaust temps

if you have unburned fuel.. and you are not detonating , then you have scope to increase the ignition lead in, no matter what the fuel