Show Wi 1 16 Measuring Horsepower in Autos I RERE nEm is only one method of or exactly C measuring horsepower In n a automobile engine and antl that 1 is 11 by hy actual test t st with Ith a mechanical machine Guchas such II as are ore built to lo show aho strain It makes no difference what formula may ho be used for tor calculating thu power Joo r of oC the tho engine trifling Inaccuracies are to result But Dut It Is possible to calculate quickly by hI seine onie means weans the horsepower of oC every en r automobile engine to within n a reasonable degree of ot accuracy and this Is 15 all nIl that f any purchaser or owner of oC theca machines machine I has hOIl h as any practical use for for or There are soy sev several EC eral formulas used by y dealers but tho the thoat best beat at anti and quickest Is the tench method which calculates upon the bore Ix re of oC tho the r cylinders tho the stroke of QC the tho pistons the number of ot the cylinders and tho the number of at revelations made by tho engine per permin min utu nt any one ono time This formula Is hero given for tor tho use nio u o of or o t automobile owners owner whoso Ideas of ot the tho thereal real P Power of ot their th lr machines Is based hI tl only on advertising statements by tho rho builders of oC any particular machine or else clue careless statements of oC dealers and This IB is the formula Tako the square of or the bore and multi multiPly Ply lly by tho number of oC cylinders Then multiply this thU last lawt figure by tho the number of ot revolutions made by 11 the engine per mIn mn uta h J this answer b by ten raised to toh tho rho nn nInth i power and multiply this result h by f four our r TO figure figuro note DOW obtained Is t the tho horsepower of ot your our machine Aa An o the tho mean menn ot of f both bOUl th tho and tho the bore boro f n I 1 usually given ghen In tho the com corn t r that result arc cumber camber tome lome but If I f an nn Inch Is 19 taken taleen to be he equal to 2 5 millimeters the tile results will 1111 bo ho uc ac accurate curato curate enough for any ordinary work Also Iao In the tho average car the tho number of ot revolutions per minute is 1000 GOO nod and on the average owner who works out this problem pro lem lam cnn can be sure that he has fount found the amount of oC his bin horsepower fur far more accurately rot than ho bo can cnn obtain It from a n dealer ealer or agent |