93 oct blend with methanol

hello Andre I would like to hear or some recomendation about what could be the appropiated afr mixing 50/50 93 oct and / methanol for N/A and FI.

thanks.

Do you have to use an AFR ratio - there are several reasons for using lambda.

1/ lambda is much easier to use and directly rlates across various fuel types and blends - 1.0 is always stoich' and less than that is rich and over is lean.

2/ reading the actual AFR requires the measuring device to be calibrated for the exact fuel blend being used. Remember, they read the lambda values then convert to the, usually, petrol/gasoline value that corresponds to that lambda -by that I mean a normal petrol/gasoline AFR gauge will show 14.7:1 for petrol at lambda 1.0, with 100% methanol at stoich', which is an actual AFR of 6.5:1, that same gauge, if uncalibrated, will still show 14.7:1. this will apply to any fuel used at stoich' with that gauge, regardless if that blend is actually 7:1 or 13.5:1.

3/you will need to review your entire fuel system, from the fuel tank, through the lines, filters, hoses, regulators and, or course, the fuel pumps - not only will you need to flow 2 or 3 times the fuel (maybe more), but you will need to ensure EVERYTHING is going to be resistant to methanol

4/methanol is nasty stuff, it's toxic and poisoning can occure through skin contact, it's corrosive to many metals when there is water content, it destroys rubber and many plastics. There is a place for it, but you need to know what you're doing and actually have a need to use it - in many cases, ethanol is the better choice.

5/ the other reasons

If you're determined to use it, M50 would have a stoich' of ~ 9:1, and for power you'll probably be looking between 8:1 and 7:1 - that's actual, an uncalibrated AFR meter would show, roughly, between 13:1 and 11.4:1. Depending on your application, engine, etc, you could go a bit richer, though.