| Show -- - - l - - - 4 ' - ki - ' - ' i t t- - ! 41 I 4 t i I I rzst51tfktztribrit r Arvqr rirgrorit 1 1 ' pAg' I1 1 Science & Technology Desk: 1 I 10 0 1 SUNDAY 237-204- 5 1 an 46" 4 A B i- - 4: - oke i Y -project said: We're committed to try to make the thing work But we're pushing technology in a region it has never been" Despite the uncertainty nearly every major car company has entered the derby Although Chrysler seems to have the proearly lead other jects are close behind Ford excar pects to have a ready for Europe this decade and Macpherson's team is trying to finish up a design for the American market Ralph Sarich an Australian inventor is responsible for the new interest in engines Sarich was working on a version of a rotary engine in the 1970s when his team devised a sophisticated injection system that used compressed air to spray fuel in a fine mist into the combustion chamber Later he tried the technique on a engine and soon had results Recently his company Orbital Engine tested a engine in a Honda CRX and saw the car's mph acceleration jump 30 percent while fuel economy soared 25 to 63 miles per gallon Now Sarich's company is completing a 200 horse- power engine for bigger cars Because Saricles engine does not have conventional valves valve springs or camshafts (which open and close the valves) it needs about 200 fewer parts than a come parably powered In Sarich's design as the piston descends an exhaust hole is uncovered so the spent gases escape as a reed in the cylinder wall sucks in new air As the piston moves up the air is compressed through a separate channel into the cylinder top there fuel and air are injected and the spark plug fires restarting the cycle By Barry LOS ANGELES TINES I ' two-stro- I Your ear has four five six 12 cylinders and unless it eight is a rotary engine — or your jalopy was made in say East Germany— chances are the engine rumbling underneath your hood is a four- stroke So named because a piston slides in a cyl- inder — four strokes in all — fore a complete combustion cycle fires On the road thousands of these explosions occur every rain- ute to keep the wheels turning motors have domi- bated automotive design this cen- tury but that might change Teams of engineers on both sides of the Atlantic and Pacific includ- ing those from General Motors Ford Chrysler Honda Toyota Subaru Fiat and Peugeot are rac- lag to finish new versions of the ancient engine that would overhaul basic automobile design First developed a century ago the hvoastroke's lure has always been tremendous power in a small package In most engines the corn-a- bustion cycle starts when a spark plug ignites a mixture of gasoline and air in a cylinder and the explo- sion fortes the piston down While e a bigger engine takes a full almost leisurely piston stroke to draw fresh air in and an other stroke to push burnt gases out a combines the air intake and exhaust in a single pis- ton stroke By working harder a engine can match a 's horsepower in half the piston strokes Think of two boats in a race One boat has four oarsmen The other boat has only two oarsmen but it keeps pace because the two are stroking or rowing twice as e fast engines remain widely used today in snowmobiles chain saws outboard boat engines and racing motorcycle& The price for all this power is a noisy gas guzzling polluting motor which is why most car compaas nies discarded 25 primitive technology nearly years ago Then a few years ago an obscure Australian company applying shrewd use of compressed air and electronic fuel injection revived the The company li- censed its design to major car companies and in early tests the reworked engine appears to offer Gasoline and engines were considered too noisy fuel inefficient and use in automobiles But recent polluting formake these simpler engines innovations to auto makers more attractive potentially oil-burni- two-stro- ng ke Four-strok- e two-stro- ke combustion chamber two-stro- ke a -- - Apilmlollo IVat g- ' r- 10011 -a- 4" - --- IIIIIIIk --- gr "b - compresskg the ' uol t7 Withdk : two-stro- ke air and fuel mixture to ready It for the next spark Ptug firing- - :?Iism aaa two-stro- ke The piston rises dosing off the transfer and exhaust ports white t ien wi: ae ' qm: ' two-stro- IN r eye-poppin- g -a two-stro- ke CV I " - aat : i I '' 141---— ' aer - ' a tad - t aae oi: saw- - I two-strok- two-stro- - two-stro-ke r NO A two-strok- than I ii 141! 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e t I — Community ---- i ' - 1 f: :' 1 21--- A I i1 t? i Free Estate pis ing Seminar Free to Public Interest Seminar bj t lk 11 & Wi11 ti1 1 - i1 -f - — tr'e4) a to) a raria—— 1 WIEIMMMN ' 1 I 1i Specializing in estate and will planning legal documents referred to Del B Rowe Attorney at Law 1100 AM Cictober 24 October 22 Yarrow Hotel 300 PAL PM 300 Park City "- i 1 folVia‘i - : AU --- tor' tt i I 's two-stro- tki Plik:ItOt A tiLl P- Nf i 11 iTVIT 11° two-stroke- two-strok- ft 1' The es compactness should lead to dramatically aerodynamic cars that are roomier in thee passenger area but smaller and sleeker out-sideboosting acceleraton and producing better gas mileage "If everything works and it meets emission standard& the car e companies recognize the could be a breakthrough" said Csaba Csere Car & Driver magazine's technical director Before the engine niitisZiriP:Viik 1 showroom floor it must pass tough durability and emission standards and even Chrysler's engineers concede that is far from certain Ian Macpherson Fords director of powertrain research who is working on his company's four-strok- ke - moves from the laboratory to the plenty of advantages: A is half the size and 40 pere cent lighter than a and figures to be $200 to $300 cheaper to build per motor because it needs fewer parts also produce The more power for their size and it is hoped they will be less polluting es SERVICE four-strok- four-stroke- Two-strok- S k er t f' two-stro- ' er two-stro- ke a tio4b two-strok- e ' three-cylind- zero-to-6- 0 I - four-strok- 1 A disk drive is most susceptible to damage when it's starting Most of the hard disk drives up or spinning down he said At that end up in the shop for re- its normal operating speed — pair are there because comput- 3600 revolutions per minute — er oa nets are not given enough the magnetic heads that read information about caring propand write digital data are flying erly for their equipment said steadily over the surface of the Steve Burgess who spends disk Under those conditions much of his time battling such it will take a pretty good jolt" to bounce the heads into the meignorance Manufacturers of computers dia and disk drives have a vested inBefore the drive gets up to terest in presenting their prodoperating speed however it ucts as easy to use said Burgess doesn't take as much of a jolt to bounce the heads That's often president of Mipro III in Redthe time people are in the act of wood City Calif "They don't necessarily see it astheir job to sitting down or getting up and tell customers what the dangers are most likely to bump the are The marketing division desk he said We see a lot of drives where stresses the benefits and the ' ease of use: Just put it on your there s been 'head slap' It looks like vampire bites all along the desk and it makes itself work" media You can see the first Macintosh computers Apple's head hits the surface the time "are particularly insidious that see and because it's relatively There isn'twhere itdataskittered way there any true- he said a dent There's there" hard-disBurgess advises To protect the media from owners to adopt a three-pa- rt such destruction put the disk strategy to protecting their drive in a place where it won't care of the "Take equipment: around — on a desk be bounced media the environment and the that's stable or on a separate tadata" ble or shelf out of the way To take care of the "media" a computer with a Don't the magnetic surface where hard diskput in a traffic drive data is recorded ifs essential to area he said Don't highit on the put avoid bounces jolts and vibrafloor under the desk where it tion can be kicked easily two-stro- 0 14neard Compression Stroke Stroke The spark Plug 'fires' forcing down the piston Ports in the cylinder wall are uncovered allowing burned gases out and fresh air in The piston also uncovers a transfer port and forces aW from the crankcase into the - By Ron Wolf KNIGHTRIPPER NEW two-stro- ' til Dovnrward firmer D17 Engine Dangers for Disk Drives rrt I ips for Protecting Them 2-Str- ! 1 October 20 1991 Innovations Rev Up Attractiveness of Starr° The New and the Old or II 1 i 'I - -- - - 1 --- - : f t I tI 1 -- t it NI ! 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