Building a bio-degradable engine

[VWSM]

i need some one who can design a spark plug that will degrade.
this engine will run on methane.
i figure a tree branch filled with carbon and threaded.

i bought the piglet for the methane,grease and seals not to mention the ribs.
it has to run at least 5 minutes..

News crew will be filming.
any hikers out there?try to find a hardwood tree with a distorted branch for the crankshaft.
it will run a reed sytem for the intake,i have a fermantation container and a vacumn hook up for the methane.
what ever we use has to de-grade.

Kick off date is Feb 7th.
David Suzuki will be Proud..
Peta another story.

anyone with any input greatly appreciated.
i figure 8 month before start up.
and any slop you have around for the hog greatly appreciated as well.

[Yasek]

Re: Building a bio-degradable engine

Metals a degradable, erode, break down due to weathering. just take a plain old steal block ehhe.

I can not picture this contraption. By engine you mean any device that transfer energy in this case chemical into mechanical? cause when i hear engine i automatically think of the conventional design piston,rods,crank,block ect.