Hello Jeff,

 

A few years ago when I installed the Toyota V-8 in a C340, I installed a Halon bottle and fire detection wire in the engine compartment.  The bottle was on the right rear corner of the engine compartment in front of the fire wall.  The detection wire was snaked around the compartment near the oil lines and the fuel lines.  I put a stainless steel outer shield on the exhaust pipes with a forced air inlet and an aft vent overboard, so a cracked pipe wouldn't direct hot gases onto the carbon fiber cowling.  I also lined the lower cowling with the ceramic paper used on Long-eze firewalls.

 

Our procedure for fighting a fire was to shutoff the fuel,(the engine will take care of itself), then discharge the bottle. 

 

The fire bottles are available from aircraft supply and are very expensive.

 

I recently painted some intumescent paint on plain old corrugated cardboard and torched it.  The cardboard did not burn.

 

Jabe Luttrell