Ingredients:
1 x 12v H7 Car headlamp bulb
1 x small tin of sweetcorn (emptied of course)
1 x 12v bulb connector plug (the £3.85 bit)
1 x S/Steel jubilee clip
1 x piece of thick wire for a handle
2 x crocodile clips & wire
Thought i'd share as it seems to work well. 3-4min warm up & i can't touch the engine for heat ! It cools down within a minute or so. Don't have a temp gauge though would be intersting to know how hot the engine gets.
Just finished running in a new engine using it & it never failed to start on the 1st pull.
I know you'd hardly sell one looking like this, lol, but it was cheap as chips