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a16 the news advertiser october 26 1972 porsche ultimate sports machine for discerning all porsche engines are rug ged tested high performance pow er plants with extensive rpm re serves and low piston velocities you can drive them at top speeds for hours on end or push them through the gears flat out a gov ernor prevents overrewing at the other extreme backedup in rush- hour highway traffic or on a citys congested streets the porsche en gine wont let you down either its aircooled so it cant boil over in short its designed for punishment almost beyond belief all three engines the 911t 911e and 911s share the same basic design the six cylinders are horizontally opposed and are covered with light alloy cylinder heads on the 911e and 911s the for special performance re quirements as an option you can have your porsche equipped with a 5speed transmission or you can order the sporto- matic option the automatic tran smission for sports drivers it com bines the advantages of the 4speed standard transmission with the be nefits of a hydraulic torque con verter with the sportomatic you can shift or not shift depending on your style and depending on the driving situation in heavy city traffic or slowmoving lines on the highway you simply remain in the selected gear no downshifting no gearing up but on the open road and in competition driving you can shift it like a straight stick heads have deep ventilating ribs to prevent excessive thermal stress the vpatterned overhead val ves are controlled by rocker arms which arc actuated by overhead camshafts above each cylinder bank the forged 8main bearing crankshaft ensures virtually vibra tionfree operation a drysump lubrication system guarantees uni form oil supply to all lubrication points even when your porsche is cornering at high speeds all three engines are fed by bosch mechanical fuel injection with horsepower ratings of 135 din hp 129 sae net hp for the 911t 165 din hp 157 sae net hp for the 9ue and 190 din hp 181 sae net hp for the 911s the bosch systems precise metering of the fuelair mixture greatly reduces unburned hydrocarbons and carbon monoxide also helping in our ef forts to detoxify exhaust emissions arc our engines low compression ratios which permit maximum efficiency when using leadfree re gular 91 octane gasoline the result an engine with pow er enough for maximum torque versatility and exceptional perfor mance and an engine that is also cleaner in the bargain the high engine speeds and great flexibility of the 24 liter en gines make it possible to provide all 911 models with a 4speed tran smission as standard equipment the engine and transmission form a perfectly harmonized single unit providing maximum power to the driving wheels the synchroniza tion is very fast only short pre cise movements are necessary to shift into the different gears the gear ranges have been carefully adapted to the engine characteris tics and individual model types this means fast response in any driving situation but without the need to clutch be cause there isnt any clutch pedal when you shift gears it clutches automatically so the sportomatic not only saves wear and tear on the drive train elements it saves wear and tear on your nerves but is the sportomatic really up to standard porsche performan ce to test it we entered a sporto matic equipped porsche in the grueling 84hour nurburgring clas- sic hoping it would give a credit able showing it exceeded our hop es by winning the overall classifi cation another instance of testing porsche components at the track the porsche chassis clearly shows there is no contradition be tween suspension damping com fort and sporty roadability the independently suspended front wheels are stabilized by wish bones in combination with torsion- bar springs and shock absorbers this means the wheels maintain in dependent contact with the road more precisely potholes and rough spots which affect one wheel have no influence on the smooth running of the other wheel also the rear wheels are in dependently suspended they are stabilized by semitrailing arms and sprung with longitudinal tor sion bars and double action hydra ulic shock absorbers antiroll stab ilizers standard equipment on the 911s arc available as options they provide for even better roadhold- ing ability the widerim wheels and tires also contribute to porsches high speed curving abilities they rein force the braking effect of the chassis substantially absorb later al forces and enable increased lat eral acceleration in addition these wheels 15 inches on all porsches have a gre ater circumference the advantage here is a smoother ride on rough roads and longer life for tires mazda s own pride and joy exhaust reducing engine the rotary engines combustion system exhaust fumes con tain carbon monoxide and hydrocarbons which are dangerous to the hu man body they can however be eliminated by simple processes thermal reactor catal yzer nitrogen oxide which causes city smog is difficult to eliminate the rotary engine has a unique combustion system with a movable combustion chamber which causes the least amount of nitrogen oxide an inherent anti pollution characteristic development of exhaust reactors the rotarv engine greatly reduces the emis sion of oxides of nitrogren in the process of com bustion something hith erto considered difficult to accomplish mazda has already developed a ther- mai reactor which oxid izes carbon monoxide and hydrocarbons some ro tary cars i those exported to us are equipped with this thermal reactor and emit innoxious car bon dioxide and vapor the size advantage of the ro tary engine makes practical the attachment of such equipment smooth acceleration and gear flexibility the operating part of the rotary engine trans fers the rotors motion directly to the wheels thus making high speed rotation possible this was difficult with the re ciprocating piston engine due to inertia the intake and exhaust systems are designed to idle smoothly and to respond instantly to any rotary motion this response is available at any speed from low to high the flat engine tor que effortlessly increases rpm and gives amazing highspeed acceleration for expressway passing the rotary engine is ideal for highperformance automobile use quietrunning visrationfree engine in reciprocating piston engines the rectilinear and rotary motion of the connecting rod and the up and down motion of the piston causes inertia un avoidably therefore the engine itself vibrates in all directions also this type ol engines valves and other complicated parts of the intake and ex haust systems are quite noisy which makes quiet highspeed performance impossible the rotary alt r100 coupe front and a new mazda engine has no parts that cause inertia and mech anical noise the unique operating principle of the 2rotary engine in mazda cars equals the smooth ness and performance of a sixcylinder piston engine lightweight and compact the rotary engines ex ternal size is about 50 per cent smaller than that of comparably power ful reciprocating piston engines it also weighs about half as much this low weighthigh perfor mance ratio becomes verv advantageous in larg er engines and brings a- bout many new possibil ities in the layout of cars fewer parts and simple construction the rotary engine is inherently simple in con struction and has fewer parts than the reciprocat ing piston engine there fore there is less chance of trouble and should anything go wrong it can easily be repaired its production efficiency can be greatly streamlined making it ideal for mass production thus the ro tary engine has manv pro duceruser advantages more than just an engine mazda wants the world to know there is more in a mazda then its rotary engine for instance mazda rx2 has a dual brake system with power assisted disc brakes in front and drums in the rear for failsafe stopping power a collapsible safety steering column is another safety feature in mazdas they also offer laminated safetyglass windshields with see- through shatter pattern and a strong unitized construction chassis for smoother rides there is a semifloating rear axel with a lateral road and there is a dual flowthrough ventilation system and an oil cooler for safer engine operation mazda has a slogan for its rx2 it isnt only quieter smoother and quicker its a safer car too cosmo mazda 110s laboratory vehicle mazda rx2