They weight approx 580 grams (w/bolts and nuts) vs the approx 540 grams of the Miata rod. They have a thicker beam, thicker small end and larger size bolts. The rods used in the 88-89 323GTX turbo are beefier. The pistons that were available for the 1.6 B6P were the 323 GTX 7.8:1 with a heavy dish (left), the Miata automatic 9.0:1 with a moderate dish (middle) and the Miata 5-speed 9.4:1 with a shallow 1mm dish (right) The 1.6 DOHC motor lived on in the Mercury Capri and XR2 until 1995. The pre-91 motors had a 22mm crank snout while the late 1991 and later had 27mm crank snouts. In 1991 a running change was made to the crank design from repeated failures of the pulley keyway. The tradeoff is a less peak HP rating of 100. These changes were done for the automatic version to gain torque at a lower rpm and minimize detonation from the torque eating trans. The automatic transmission version of the 1.6 DOHC engine has lower compression pistons to 9.0:1 and the camshafts have less duration. (how many NA motors do you know have oil spray cooling for the pistons). This means that the NA version of the motor is quite over engineered for its applications. It mainly differs from the turbo counterpart in higher compression pistons (to 9.4:1), lighter connecting rods and a lighter flywheel. The 116 HP Miata 1.6 DOHC motor from 1990-1993 is a normally aspirated version of that 323 turbo engine. See SSS Automotive site from Australia for B6T tidbits. A stronger web stiffened block and oil spray cooled pistons were among the changes. Because of the severe duty that motor could see many enhancements were made to it for reliability reasons. A DOHC head was designed for the 1.6 liter for the 1988 323 GTX turbo. The 1.6 liter version has as large a bore as the block can accommodate and cannot really have it's displacement increased much more, in fact, enlarging the bore beyond +1mm is not advised. The primary example of the early ‘B’ motors in the USA came here in the GLC as a 1.5 liter SOHC, later upped to 1.6 liters for the 323 in the mid 80’s (78x83.6mm). It was primarily used oversees but did come to the USA for a short stint in the Ford Festiva (other markets got a DOHC 1.3). The ‘B’ family starts with a 1.3 liter SOHC. They are grouped into engine families, ‘B’, ‘F’, 'Z' and ‘G’. There are four basic types of 4 cylinder piston motors that Mazda currently produces for the US market. Like most auto manufacturers Mazda has a lot of commonality between engines. If this sounds damning with faint praise, it’s not meant to.Mazda 4 cylinder Engine History and Interchangability Guide Should you be tempted by something weighing 2430kg and powered by a V8 petrol engine you’ll find yourself with a performance SUV that steers closer to being a genuine luxury car as it is as a mountaineer – and a driver’s car quite a few levels below that. And in with the new, the new being Land Rover’s new V8, which is actually BMW’s 4.4-litre twin-turbo V8 that you’ll find in the likes of an M550i.Īs quick as the outgoing SVR but 17 per cent more efficient, the new Sport P530 will be a small player in the model’s sales makeup, especially so in the UK, but if you’ve been put off by the overt approach of the now defunct SVR, the P530 might tempt you away from the in-line six-cylinder petrol and diesel and plug-in hybrid models that will make up the bulk of sales. Out with the old, in this case the five-litre supercharged V8 that served Land Rover and Jaguar across everything from XE saloons to Range Rovers, and the boisterous Range Rover Sport SVR.
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