Carburettor Heater - need help
Hope this is in the right section.
I am working on a project to heat the body of a carburettor (Bing 84) in order to prevent carb icing. No commercial solution exists for my carburettor. My engine (for paramotoring) is air cooled so can't use water from cooling system.
My idea was to strip out the nichrome heating element from a car cigarette lighter and use that. The heat needs to be applied to the metal casing of the carburettor, preferably being hottest near the air intake side of the carb. I decided the best place was where the air filter is attached - a 12mm long metal throat with a 35mm diameter The trouble is, I don't know I can transfer the hundreds of degrees of temperature from the nichrome to the metal body of the carb without just shorting out the battery. If I am to have a layer of insulation between the nichrome and the carburettor, what can I use that will conduct heat but not electrical current, and withstand around 300 degrees of heat? I also thought about reducing the current and spreading the heating over a larger portion of the metal casing, which would allow the temperature to be lower.
I have also been experimenting with motorbike hand grip heaters that run of 12v but they don't generate enough heat - I need to be pumping in around 8-10A as the internal cooling effect of the fuel vaporising rapidly causes sub zero conditions inside the carb even when the outside air temperature is well above freezing. I have a 7Ah li-ion which I would only switch on when required (maybe have a latching push button on throttle control).
It may not be doable but its an interesting project nonetheless and something I am going to play around with. Any ideas?