If you fit a snorkel and all the necessary breathers are fed into it there shouldnt be any reason (as long as its diesel) that the engine couldnt be completely submerged. As long as the driver dont drown that is.
 
Did you know that the Bible proves that human skin is the most elastic material in the world.















After all, it says in Exodus that Moses tied his ass to a tree and walked a mile.
 

Similar threads