Show 4 I When Car Loses Pep It Is Time for Autopsy Uy Ly ILEIN Science XEA NEA Service r i to the th car has hila ha lost Its It's if S Sr I p I p and power 1 Sh 51 Sir to run lun more mor easily j n a r Shell She'll start ou oft 01 a a mere st i-st t ot or the crank It need be it t ill Bk won t climb the tho hills hllL shed she the i shei d to take lake easily In ill high she sheI wont pull ahead of ot traffic as she to I Wo 0 et 01 i of ot all hll she's eating catine up more th than her usual ot or gas ga and the oil all has to be b renewed too a often otten lip lipAn i An autopsy on an engine dis playing such symptoms symptom wilt will most mo M likely reveal worn down pIstons 1 and cylinder walls walli as the major r Whit Wb-t h t happens as a result of at f d tM war wear is the loss of ot power only partial combustion or of th thi fuel and through partial pr pI ur un- un of ot the expanding gas against C the tho worn cylinder The Ther Therit r it jt of at the gas cas escapes escape through 11 I 1 widened rap gILl between piston and cylinder wall worse Is that the un- un unburned burned un-burned burned gasoline flows down u ou h this gap tap mixes with the th lUll tini- tini oil In the tho crankcase u H d a play further havoc OC with walls and tho the bearr bear- bear r oil dilution Is a ser ser- lous cr-lous taus sous problem automotive engineers trying to combat it In the laboratories ln mg to learn what causes it howIt how 1 tl H aft cw att-cw the engine and what c n h be br done don to prevent It it I Gasoline mixing with the th sort soft oil In the th crankcase cuts it andr and 1 r dues ducts Its it oiliness Instead of othi I the thin protecting film t that Is cylinder ne 01 di d between piston and cyl- cyl cyl inder wall to prevent friction be- be be be moving parts parta and to keep the tho expanding gases cases and I fuel from escaping I through this space theres there's there an un- un un even e liquid ld that acts act almost as asan asan asan an abrasive and leaves openings for the unwanted mixtures mixture Tho The oil all thins out In the crank crank- crankcase crankcase case fuel tuel Is wasted through the widening piston and cylinder gap power le Is I lost through eB escape apo of ot the expanding Q gas tas s a-s The fhe cause cause of at this goes back to poor IOOr driving drivins and lack of con con- eon eon- consideration consideration tor for the th engine ensine When WIlen the th car Is first started the space between piston between piston and cyl- cyl cylinder cylinder cyl cylinder inder wall Is dry It takes quite n few turns of the tho engine to bring the oil up Into the cylinders and leave the required film for good smOoth running I Impatient drivers tall fall to con con- con consider sider this They race tho the engine I before the oil has been able to get through affording two good chances tor for crankcase oil dilu- dilu dilution dilution llon tion Racing Racine the engine requires an overdose ot of fuel fue An overdose 1 al- al almost al almost I most Invariably leaves a large res- res residue res residue idue ot of t unburned fuel in the I combustion chambers Racing the engine Immediately on starting makes it harder for tor forthe the tho oil all In the to como come up and cover the th cylinder walls with its protective film and SO leaves an inviting gap gal tor for the unburned fuel to seep through Racing Racine never did an engine any good Its It's It the easiest and quickest way IlY toward diluting the tho th crankcase oil with unburned fuel toward scoring scoring ing the cylinder walls waits and bear bear- bearIng bearing Ins bear Ing surfaces toward reducing power and ond eating up lots Iota of ot gas and oil Start easily run the th engine sloWlY dont don't jam down the ac- ac accelerator accelerator ac accelerator suddenly and you'll dim mate the troubles arising from oil ell dilution |