Remove Carbon To Stop Knock

NZ Truth, Issue 1197, 8 November 1928, Page 21

Remove Carbon To Stop Knock

OWNERS of extremely high compression engines,' those carrying "red heads" and the like, should be careful to use anti-knock fuel and to have carbon removed at customary intervals. They cannot afford to follow the policy of the' user of lower compression who lets carbon accumulate and who finds the arrangement efficient so long as he uses ahti-knbck gas. • Some of the v high-compression engines allow a clearance of only 1-32 of an inch between pistons and ""cylinder head. Just a little carbon will raise compression to a point where knocking will occur even with the most modernistic : fuel available.

As yet there is .no "super antiknock" fuel. If a motorist wants high compression performance all the time and without knocks he must use antiknock gaa and ■ remove carbon whenever knocking commences.