The Bridgeport evening farmer., 1916-05-20
HARRY FAIRNESS MAY DRIVE AUTO.
 AT INDIANAPOLIS

Indianapolis, May 2O-Harry K. Hardness, New York millionaire, moving spirit in the speedway at that city may drive at the Indianapolis
 motor speedway race May 30.. Carl Limberg, who met his death in the New York race recently, was driving one of the cars owned by Hardness This leaves a vacancy in the Hardness team. Hardness holds the New York to Boston record for five hours and 30 minutess( and at one time was prominent in smaller races and hill climbing events. He has two Delage cars and one Pusun.
 The chassis of Christiaen's Sun beam car -iss the same that appeared in races in this country in previous years, but the aviation motor is en- tireIy new. Details of specifications and equipment of the new Sunbeam motor which it was previously inn possible to obtain are now available. The motor is a six-cy1inder type with a bore of 81 nm. and a stroke of 15O mrn., or 3 3-16 by 5 A inches. One set of spark plugs is used, ignition be- ing by a single Bosch magneto driven at three-quarter engine speed. There are two oil pumps, one for the ball. bearing crank-shaft and the other for the cam-shafts. The motor has a single breather pipe to each cylinder. Ihor0 are IOur waves to e6Cn Cy11I1- der, making 24 valves in all.
 The cam-shafts are mounted over head, the valves being set at angle in the top of the Cylinder head and the cam shafts are driven by a yer tical shaft and gears from the front of the engine. Two carburetors are used, with a separate intake mani fold for the three forward and three rear cylinders respectively. A four speed gearset is employed and the rear reduction on direct drive is 2.1 to 1. There is a revolution counter fitted. The exhaust manifold is car ried outside the hood and is pointed at the forward end.
 Rickenbacher's victory at the New York speedway strengthens the belief of many speedway fans that he is likely winner at Indiana polls May 30, and has aroused considerable curios- ity as to the construction of the Max well cars which compose the Prest- O-Lite team. The motors have a bore of 3 3% and a stroke of 7s, with dis placement of 20O.98 cubic inches. The valve sizes have been changed slightly, the intakes being increased to two inches; this is A inch greater diam eter than in the 1915 races. The ex- haust valves have not been changed, but the lift of all valves has been in creased to 1s inch, the cams opening now 7-16 of an inch. The divided in take manifold of the 1915 cars has given way to a more direct and proba- bly, more efficient intake in which the whole side of the cylinder head cast ing above the intake valves is opened up to the gas, thus giving a blanket of fresh gas over the entire intake valve area.
 The oi1ing system has been changed somewhat, chiefly through the use of a triple gear pump, instead of a dou- ble one employed earlier. The system is forcefeed circulating one in which fresh oil is drawn continually from the oil tank under the frame and re- turned to the, latter after use This keeps the oil coo1er than would be possible otherwise Connecting rods still are made of chrome-vanadiurn, steel and have been subjected to ac-' curate machining over all.
 The I-bearn section is further strengthened by forging webs on either end of the section, making a very sturdy rod. The use of magma Hum pistons is continued. magnalium being an exceedingly light and strong alloy. The piston heads are domed to give them strength and each has five rings. There are two diagona1ly split rings in each of the upper grooves and one wider ring below which is used for a retainer for the wrist pin. The use of magna1ium re- duces the piston weight from over two pounds, the weight of a similar cast iron piston, to about 1 5 ounces. In explanation of the counterbalance crank-shaft it might be explained that the fy-wheeI function is distri-