shadowplane676:
Indeed, it is a harsh environment. from what I can tell, the Lenardo is all SMD components, so vibration shouldn't be too much of an issue, especially if its isolated a bit from the frame etc. either potting the Arduino or enclosing it in a sealed box should also address the weather elements.
I was referring to the electrical environment, not the physical environment.
shadowplane676:
I already have done a Megasquirt-II v3.0 install on my project car a number of years ago with great results. Unfortunately the only US-based distributor that I found in my search was autosport.com and they wanted $162 +shipping for a megajolt lite jr. v4. With that cost, that's when I started looking into Arduino.
The Megasquirt hardware and software designs are readily available and you could build your own for a fraction of the cost of a built one from a commercial supplier. Whichever route you took, you would have to provide your own driver hardware and filtering circuits etc for your Arduino-based solution in any case, and of course you would have a hell of a lot of software development, testing and debugging to do before you were ready to even start trying to get it working on a real engine. No reason why you couldn't design the hardware and software from scratch using Arduino, but using an existing hardware and software design just seems like the smarter option to me.