ENGLISH MAKERS' DRIVE

NZ Truth, Issue 1193, 11 October 1928, Page 20

ENGLISH MAKERS' DRIVE

Giving New Zealand More oj the Bulldog Breed

THE year 1928 has been noteworthy for the great advance m British cars m the New Zealand market. .

THBREare several reasons for this I but hot the least is that British

manufacturers are now striving hard to produce cars suitable for conditions other than are met with m England, and to get the last possible ounce of power out of the 'petrol used.

..The extent to which the more progressive manufacturers m England are going In the battle for efficiency is well exemplified m the methods used by the Star Company m producing their 1928 models.

In the Star, as m many other cars, alloy pistons are used, and they have suffered, from the ills due to the fact '!iaf a greater margin

has had to be made for the differ-

ence m the expansion m the alloy

pistons and the cast iron cylinders,

After much experimenting the Star Company has perfected a design whieji at, one stroke does away entirely with all the troubles previously met witb/in the use of alloy pistons. , .

The first feature of the method is .to use V harder wearing- metal for the cy-

Under' bores, the second, is to machine these cylinder barrels both outside as Well as inside, so that the section is definitely uriif orm and free from distortion uHder working temperature due to unequal expansion.

i Th6n the Interior surface of the cylinder bores }a finished to a -state', of high polish, but riot by grinding* for the heatof the grinding wheel is liable' to alter* the. nature of the surface of the 1 metal, and, also, fine grains of abrasive substances are likely to be left imbedded m the material. '

The piston, which has a split skirt on the lesser thrust side, is finished off with a diamond tool.

; Both piston and cylinder wall sur-. faces are' therefore polished m a way that leaves no "cord,"- and as a result of these precautions,/cari' be run on m the other with a clearance as fine as that used with cast .Irson.

; The Star car is already on the New Zealand market, and is, m very; high favor with its owners. '