by ffkiwi » Sat Feb 27, 2016 1:39 pm
As per the previous reply-you're pretty much out of luck on this one....YES it IS possible to run a Cox on straight fuel BUT they're most unhappy, become hard to needle and sag badly when you disconnect the starter battery. They were designed and built around nitro fuels in the 10-30% range (depending on the model and size) so don't really handle straight fuel at all well. You may be able to improve things a tad by fitting the 1702 high compression head, as engines running 0 nitro require higher compression than ones running nitro. Alternatively-check how many gaskets are fitted under the glowhead and remove all but one (you need the one to ensure the head seals properly!) If there is only one gasket fitted then you are really up against it. You could try and source RC car fuel which is usually 16% or better nitro-DO NOT USE IT AS PURCHASED though as the oil content will be too low for the Cox. You can then add castor to bring the oil content up to something around the 20-22% total mark. Doing this will of course dilute the nitro % slightly-but there is no alternative (other than mixing your own-which seems out of the question in this case)....of course if you find some high nitro car fuel (30%+) then there is no real problem, once you got the final oil content right. I would not recommend trying to run the Cox on less than 10% nitro. That's about all that can be done in your specific situation. Does anyone do full size drag racing in Zambia? Drag racers use nitro in large quantities-so if you can find some drag racers there and explain your situation they might give you a litre or so. still fairly long odds I imagine...
ffkiwi