This page brings together the uprated engine parts we stock for the MAZDA 1.6L 16v B6, the unit fitted to the first-generation MX-5. It lists SUPERTECH black nitrided stainless valves, 31.00mm and 32.00mm on the intake side and 26.20mm and 27.20mm on the exhaust side, all with a 5.94 to 5.96mm stem and a 105.35mm length. The bottom end is covered by WOSSNER, SUPERTECH and WISECO forged pistons from 78mm to 79.5mm bore and 8.5:1 to 11.3:1 compression ratio, by ZRP and MANLEY forged connecting rods with ARP2000 or L19 bolts, and by KING RACE and ACL Race Series tri-metal big end and main bearings listed for the B6, B6F block.
The MAZDA 1.8L 16v BO block is covered here by a single item, and it is the centrepiece of any build: the WOSSNER kit of four forged pistons. Two sizes are offered, an 83.5mm bore for a first rebore and an 84mm bore for a second, both with an 8.6:1 compression ratio. That moderate ratio suits an engine destined for boost or for sustained hard use, where the cast original part reaches its limit. Forging brings the mechanical strength needed for high engine speeds and heavy thermal loads.
The BP is the 1.8L 16V unit of the MX-5, and this page gathers the parts that push its limits further. On the cylinder head side, SUPERTECH valves cover the intake at 33.00mm and 34.00mm and the exhaust at 28.00mm in black nitrided stainless, at 29.00mm (+1) oversize and at 29.00mm in INCONEL, all with a 5.94 to 5.97mm stem and a 102.60mm length, alongside CATCAMS 46-tooth vernier cam pulleys sold in pairs. On the bottom end, forged pistons come from WOSSNER, WISECO, SUPERTECH and JE PISTONS between 83mm and 85.5mm bore, forged rods from ZRP and MANLEY, and tri-metal bearings from KING RACE and ACL Race Series for the BP-ZE.
This page carries a single listing, but it opens onto two opposite build strategies for the 2-litre FS block. The WOSSNER kit of four forged pistons drops the compression ratio to 8:1, the figure for a boosted engine that has to take high boost pressure without knock. The WISECO kit stays at 9.2:1, closer to the standard figure, and suits a naturally aspirated build or moderate boost. Both come in 83mm, 83.5mm and 84mm bore sizes, which leaves two successive rebores before the block needs sleeving. The listing also covers the LS, the second code of the same 2-litre 16-valve unit.
The LF is the 2-litre 16-valve engine of the MZR family, fitted to the Mazda 3 and shared with the Ford Focus, and the cylinder head dominates this page. Eleven SUPERTECH part numbers are listed: three INCONEL exhaust valves at 30.00mm, 31.00mm and 32.00mm, two black nitrided stainless flat head exhaust valves at 30.00mm and 31.00mm, and six black nitrided stainless intake valves from 35.00mm to 37.50mm in flat head or standard head, all on a 5.48mm stem. The bottom end follows with ZRP forged rods in H or I profile with ARP2000 or L19 bolts, and WOSSNER, WISECO and SUPERTECH forged pistons for the Duratec, LF and MZR range.
This page covers the bottom end of the MAZDA 2.0L 16v FS / LS engine. Forged pistons are offered as WOSSNER at 83.00mm with an 8:1 compression ratio, and WISECO at 83.00, 83.50 and 84.00mm at 9.2:1, which covers the standard bore and the first two oversizes. Cylinder head work is served by SUPERTECH valves: INCONEL exhaust valves from 30.00 to 32.00mm and black nitrided stainless intake valves from 35.00 to 37.50mm, references the manufacturer lists for the Ford Focus and MAZDA 3. Pick the bore and the compression ratio that suit your build.
The 2.3L 16v MZR, sold as the Duratec by Ford, is covered here by three forged piston brands. SUPERTECH spans bores from 87.00 to 90.00mm with high compression ratios up to 11.6:1 for naturally aspirated builds, while WISECO and WOSSNER fill in from 87.50 to 89.00mm. ARP head studs, part number 218-4702, are listed by the manufacturer for the MAZDA 3 and 6 MPS 2.3 and secure the head clamping load. On the intake and exhaust side, SUPERTECH INCONEL and black nitrided stainless valves are listed for the Ford Focus and MAZDA 3. Choose the bore, then the compression ratio.
The 2.3L 16v MZR DISI is the direct injection turbo block of the MAZDA 3 and 6 MPS, engine code L3-VDT. This page covers its complete rotating assembly. Forged pistons from MANLEY, WOSSNER, WISECO and SUPERTECH are offered in 87.50 and 88.00mm with a compression ratio lowered to 9.5:1 to suit boost. MANLEY forged connecting rods come in H beam, H Heavy Duty and I Heavy Duty, all with ARP2000 con rod bolts and a 22.5mm gudgeon pin for forged pistons. ARP head studs 218-4702 complete the build. SUPERTECH valves are listed for the Ford Focus and MAZDA 3.
The KL is the 2.5L 24 valve V6 fitted by MAZDA and also used by Ford. This page carries a single item, but it covers the core of the bottom end: a set of six WISECO forged pistons, offered in three bores, 84.50, 85.00 and 85.50mm, and in two compression ratios. The 8.5:1 suits boosted builds, the 11.5:1 suits naturally aspirated engines chasing efficiency. Choose first on the oversize your block has been machined to, then on the compression ratio you are aiming for. No other part family is in stock for this engine at present.
The first generation MAZDA 3, BK chassis, is served here by two routes. For the 3 MPS and its 2.3 MZR DISI turbo, engine code L3-VDT, the full rotating assembly is available: MANLEY, WOSSNER, WISECO and SUPERTECH forged pistons in 87.50 and 88.00mm at 9.5:1, MANLEY forged connecting rods in H beam and I Heavy Duty with ARP2000 bolts and a 22.5mm gudgeon pin, and ARP head studs 218-4702. For the cylinder head, SUPERTECH INCONEL and black nitrided stainless valves cover intake from 35.00 to 37.50mm and exhaust from 30.00 to 32.00mm, flat head versions included.
The NA chassis is the first generation MAZDA MX-5, and this page gathers every uprated part we hold for it. Two sub-categories point to the 1.6 engines, the naturally aspirated 115hp B6ZE and the turbocharged 150hp B6GP, where the ZRP and MANLEY forged connecting rods sit. On this page the cylinder head is served by SUPERTECH intake and exhaust valves, in black nitrided stainless steel and in INCONEL, together with CATCAMS vernier cam pulleys. The bottom end brings ACL Race Series bearings in OEM size, KING RACE bearings with their thrust washers, and forged pistons from WOSSNER, WISECO, SUPERTECH and JE PISTONS, 78.00 to 79.50mm for the B6 and 83.00 to 85.50mm for the BP.
The second generation MX-5, the NB chassis, is covered here through the bottom end of its 1.8 DOHC 16V BP-ZE. KING RACE tri-metal big end and main bearings come in OEM size with their matching thrust washers, and ACL Race Series covers the same ground in standard size for the MAZDA 121, 323 and MX-5 1.6 and 1.8. Sealing is handled by the ATHENA O-ring head gasket, 1.4mm compressed thickness and 84.5mm bore. The set of four forged pistons for the 1.8 BP completes the page: WOSSNER, WISECO, SUPERTECH or JE PISTONS, 83.00 to 85.50mm, which covers the standard bore and five rebore sizes.
The L5 is the 2.5L sixteen valve unit of the MZR family. This page carries a single item, but it is the one that decides how far a bottom end can be pushed: the set of MANLEY forged connecting rods in the H-Beam Heavy Duty profile, made to work with forged pistons. Two versions are offered and they differ only by their bolts. The first is fitted with ARP2000 bolts, the usual choice for fast road and track builds. The second takes CA625+ bolts, a higher grade steel meant for boosted engines with high torque, and the price follows. Move up to the second one as soon as the target output goes well beyond standard.
