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. Note that the NB throttle cable adapter will need to be clearanced slightly if you're using a square top manifold.Mazda 4 cylinder Engine History and Interchangability Guide This is a pretty rare combination of parts to need.
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This may or may not be solvable, depending on how aggressive you're willing to get with modifications.
#1995 MIATA 1.8 JDM ENGINE MANUAL#
If you use an NB intake manifold (which moves the throttle body closer to the valve cover) and a 1.6 auto TPS (which is much thicker than the manual version), you'll find hard interference between the TPS and the valve cover. The coil bracket is not compatible with VVT engines. We no longer offer anything to block the EGR as those parts are federally illegal. Bear in mind that you'll need to retain both the EGR valve and the EGR pipe. If you do the former, the EGR will be sealed up and the engine will function normally, but you'll have some extra (and non-functional) hardware. Your 1.6 computer won't run the EGR on your new 1.8 engine, so you can either leave the plumbing in place or remove it (and block it off on your own). Please read the instructions prior to buying used parts for your swap to be sure you get the right parts for your purposes and to ensure they'll work together.
#1995 MIATA 1.8 JDM ENGINE HOW TO#
If you're using a stock intake or don't want to swap thermostat necks, the hose splice will make your life a lot easier.įor more information on how to do a 1.8 conversion, our instructions will give you lots of specifics. electrical parts needed to extend your CAS wiring.All the parts are available separately as well. Not anymore - this kit includes everything you need for the swap. In the past, there was some fabrication involved. 1.8 swaps are becoming more and more popular and with good reason.
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