[Stoves] why can't we use wood gas directly in an i.c. engine?

[Anand Karve]

Dear Stovers,
 fuel in the form of a combustible gas seems to be a pre-requisite for an
internal combustion engine. Even liquid fuels are atomised before
introducing them into the cylinder of an i.c.engine. Wood gasifies when
heated, but this gas is used in internal combustion engines only after
filtering out the tar. Why is it necessary to filter out the tar? Tar is
combustible and it is gaseous if the temperature is high. Stoves which
provide secondary air with the help of a fan have shown that the wood gas
can be completely burned, along with the tar, if enough air is provided to
it. So why filter out the tar before using wood gas in an i.c.engine?
Yours
A.D.Karve
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