Thanks guys for your statements 👍🏻

So if i get this right all the onroad racers do to go from 25 to 16 % nitrofuel is just tweaking the needels a bit and maybe change to a hotter glowplug?

Here is a part of the EFRA fuel letter written by Mr Comes.

The truth is that switching suddenly to a 16% is complicated (we already saw what happened with 1:8 I.C. Track), but going to 12% can cause breakdowns everywhere, having to buy new engines designed for that type of Nitromethane content.

i agree with roelof that our engines may work flawlessly with different fuel, an i see not why there should be a breakdown!

But what breakdowns Mr. Comes is talking about?