30 % Nitro or higher vs 25% Nitro or lower
Originally Posted by hello
I still don't understand
The flame speed of Nitro is much slower than that of Metanol, so by adding Nitro the mixture slows the flame speed. This should not be a problem until you hit very high rpmís. There's a moment where the engine cannot pickup more rpmís because it needs to burn the mixture at much higher speed in the combustion chamber.
30% nitro burns at a lower temp so it will give you advanced timing and therefore more low end power.
With lesser nitro, you may need to lean it a little more and your fuel mileage will be a little better, temps will vary and combustion chamber and carb setup need to be revised, but... more nitro doesn't necessarily mean more power, but yes more fuel consumption and less runtime for the same CCís.
Higher nitro content does not cool the engine, in fact it creates more heat. Basically, more nitro = more oxidizer to the methanol which in turn creates higher combustion pressures which create more heat.
On the other hand, higher oil content will cause cooler running, because the oil tends to help with heat transfer and expulsion, so the more oil the cooler the engine will run (to a point of course),
too much oil will cause the mixture to be mandatory leaner to run properly, thus bringing the heat back.
You donít get full RPMís with 30% nitro as you would with lower %.
With 30% you naturally have to richen the engine, it gives you more low end power due to the 30%...but just not all the power at top speed.
With lower % nitro you can lean it out for more top end power.