' Roll Era - Collection (1989-2001) 320 [UPD]
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The high technological standard includes the recognised high safety level which the Mercedes-Benz engineers give the vehicles for the road. In the R 129 series this standard is manifested, for example, in the automatic roll-over bar which pops up in just 0.3 seconds when the car threatens to overturn. Or in the integral seat featuring some 20 patented detailed solutions, which absorbs energy in a side impact and incorporates among other things the three-point seat belt with belt tensioner and the belt height adjustment coupled with the head restraint adjustment. The safety features, of course, included a newly designed body which was subjected to the severest crash tests and affords the occupants the highest level of safety.
The energy to operate the soft top is provided by an electrically driven hydraulic pump which is accommodated in the spare wheel recess together with the oil reservoir. The microprocessor-controlled motions are monitored with the aid of 17 limit switches, and the hydraulic system has 15 pressure cylinders and eleven solenoid valves.
The exemplary solutions include the draught-stop. Unlike the electro-hydraulic soft top it was not viewed as a high-tech marvel, but its development also involved attention to complex details. The draught-stop consists of a framed, breathable screen which can be quickly attached to the roll-over bar and, when raised, appreciably enhances ride comfort when the soft top is open by minimising wind noise and draught. With the draught-stop, leather jackets and caps for driver and front passenger are a thing of the past, as is tousled hair for the ladies. Even high speeds cause no draught problems anymore, and open-top driving at low temperatures becomes a real show. Today the innovative draught-stop, for which the inventors hold four patents, is practically a taken-for-granted component of many convertibles around the world.
From September 1995 on the Electronic Stability Program ESP® was available for the SL 500 as an optional extra. It was standard equipment for the SL 600. From December 1996 on the six-cylinder models also could be fitted with ESP® if they were ordered with the electronically controlled automatic transmission available from June 1996. Another world first serving active safety also saw use at this time: the Brake Assist BAS, installed as standard from December 1996 in all models of the 129 and 140 series. BAS is able to detect emergency braking and, if need be, automatically build up the maximum brake boosting effect in shorter time than before. This distinctly reduces the braking distance of the vehicle. In early April 1998 the Electronic Stability Program ESP® was included in the standard equipment of the SL 500 and SL 60 AMG; in August 1999 it also became a standard feature in the two six-cylinder models, SL 280 and SL 320.
From 1989 to 1993 there was also the 300 SL-24 model featuring a newly designed four-valve-per-cylinder six-cylinder engine (M 104). This engine is based on the M 103, and its parts are mostly identical with those of the two-valve counterpart. New were the four-valve cylinder head and map-controlled electronic intake camshaft adjustment, used for the first time at Mercedes-Benz. In conjunction with a higher compression ratio and an electronic ignition system with anti-knock control, the result was a 29 kW increase in output over the M 103 to 170 kW. The performance of the 300 SL-24 was thus noticeably sportier despite almost identical fuel consumption (top speed: 240 km/h, 0 to 100: 8.4 seconds), but had to be bought at an additional cost of almost DM 10,000. The successors to these two models in the years 1993 to 1998 were the SL 280 (2.8 litres displacement, 142 kW) und SL 320 (3.2 litres displacement, 170 kW), both with four-valve-per-cylinder six-cylinder engines from the M 104 series.
The 1995 facelift brought improvements to the engines and transmissions of the SL 500 and SL 600 models. From September 1995, both featured a five-speed automatic transmission with torque converter lockup clutch, a completely new development that replaced the previous hydraulically controlled transmission. The heart of this technical wonder was an electronic transmission control that quickly and automatically adapted shifting behaviour to every driving situation and permanently exchanged data with the electronic engine management. Apart from these forward-looking innovations the automatic transmission was appreciably more compact and lighter than comparable five-speed units. The engines were revised once more to cut fuel consumption and pollutant emissions further. For this purpose the 5.0-litre V8 engine got a modified crankshaft, optimised valve timing, lighter pistons, individual ignition coils for each cylinder as well as an improved electronic engine management system called Motronic ME 1.0. Fewer changes were made to the design of the V12 power plant and merely concerned the configuration of the ignition coils and the electronic engine management. As a result of the various modifications to the engine and the use of the new automatic transmission, the fuel consumption of the SL 500 and SL 600 could be reduced by ten percent with output remaining unchanged.
In July 2001 the Mercedes-Benz SL 500, the first model of the new SL series, the R 230 series, had its world premiere. In the same month the last of a grand total of 204,940 units of the R 129 series rolled off the assembly line at the Bremen plant. In terms of overall volume the first SL manufactured in Bremen was not quite as successful as its predecessor from the R 107 series (237,287 units); but if average annual production is compared, the R 129 series with some 16,500 units takes a very clear lead. The most successful model of this series was the five-litre variant equipped with the four-valve V8 engine M 119, of which a total of 79,827 were produced from 1988 to 1998. The rarest variant by far is the SL 280 with V6 engine, which served as entry-level model for the series from 1997 and rolled off the assembly line only 1704 times.
Continuing the Mercedes-Benz tradition of introducing safety innovations, the R129 featured a retractable roll bar. While it could be raised or lowered by the driver, the roll bar would also automatically deploy in approximately 3/10ths of a second when the car detected a rollover was imminent. Additional advancements included a new multi-link rear suspension and electronically controlled damping system (branded Adaptive Damping System or ADS).
Alongside the power-operated roof, it featured and dual-range four-speed automatic gearbox, and some SLs even came with suspension that lowered itself at speed. But passive safety moved to another level, thanks to a pop-up roll-over bar, that reacted within milliseconds of an impending roll-over, and a profusion of airbags and traction/stability systems. Six-cylinder 300 has either 190bhp or 231bhp in 24-valve twin-cam form; the 500 packed a 32-valve 326bhp V8 and later ones could be had with a five-speed auto. Unlike earlier SLs, these have the performance to be considered proper sports cars. 2b1af7f3a8