This page gathers the NSB Concept range for the Volvo 1.8L 16v block, engine code B4184. It is currently built around one WISECO forged piston kit, offered in 81.5mm and 82mm bores at a 9:1 compression ratio, in both standard and AP execution. That lower ratio is what forced-induction builds look for, where detonation margin matters more than part-load efficiency. The B4184 shares its architecture with the Mitsubishi 4G93, which the kit designation itself reflects: the piston dimensions apply to both applications. Connecting rods, big end bearings and head gaskets are not listed on this page.
The B4194T is the 1.9 turbocharged four-cylinder Volvo fitted to the S40 and V40 T4 among others. This page covers its two key components, the ones that take the boost pressure. WISECO forged pistons are offered in 81mm at an 8.5:1 compression ratio, with several oversizes available up to 82mm. ZRP forged connecting rods come with their ARP2000 bolts, the only fastener that holds the required clamp load on a rod worked in tension at high revs. One point to read before ordering: the rod kit designation carries the B4204T and B4194 codes rather than B4194T alone. Check the code stamped on your own block.
The B5204T2 belongs to Volvo's modular five-cylinder family, where a two-litre capacity hides a twenty-valve layout. NSB Concept currently lists a single part for this block, but it is the decisive one: the JE PISTONS forged piston kit, part number JE-359522C-05, 81.5mm bore, 8.4:1 compression ratio. Such a low ratio is a deliberate choice for builds running high boost pressure. No connecting rods, big end bearings or head gaskets are listed on this page. For rods on a modular five-cylinder of the same family, see the 2.3L 20v B5234T and 2.8L 24v B6284T pages.
The B230 is the 2.3-litre eight-valve red block, the most widely used tuning base in the Volvo range, and this is the best stocked page in the tree. Four WISECO forged piston kits are listed, in 96mm and 96.5mm bores, with compression ratios stepped from 8.2:1 to 8.6:1. The choice is not made on bore alone: some kits are calculated for a 158mm rod, others for an 86mm stroke crankshaft. Read the full designation before ordering. Two lengths of ZRP forged connecting rods are available, 152mm and 158mm, supplied with ARP2000 bolts, and KING RACE tri-metal big end bearings are offered in standard size.
The B23A comes before the B230 in Volvo's red block four-cylinder line and shares most of its architecture. NSB Concept covers two points here: the WISECO forged piston kit in a 96mm bore at an 8:1 compression ratio, the lowest in this whole tree, and the KING RACE tri-metal big end bearing set in standard size. That bearing is the very same part as the one on the B230 page: its listing covers the B200, B204, B23, B230 and B234 blocks. No forged connecting rod is attached to this page. Should your build need some, the 152mm and 158mm lengths are listed on the 2.3L 8v B230 page.
The B234F is the twin-cam, sixteen-valve version of the 2.3-litre red block. The cylinder head changes, the bottom end stays true to the family, and this page follows that through. Three WISECO forged piston kits are listed, all in a 96mm bore, at an 8.5:1 compression ratio for two of them and 9:1 for the third, the choice depending on the rod length and crankshaft stroke you have settled on. The ZRP forged connecting rods in 152mm and 158mm are exactly the ones used on the eight-valve B230, supplied with their ARP2000 bolts. KING RACE tri-metal big end bearings complete the assembly in standard size.
The B5234T is the 2.3-litre twenty-valve turbocharged five-cylinder Volvo fitted to the 850 and the C70 T5. Unlike the red block pages, this one relies on a rotating assembly cut for an aluminium white block, with its own set of constraints. The WISECO forged piston kit is offered in an 81mm bore at an 8.5:1 compression ratio, a figure that leaves headroom under raised boost pressure. The ZRP forged connecting rods carry the two relevant vehicles in their very designation, 850 and C70 T5, and come with their ARP2000 bolts. Neither bearings nor head gaskets are listed on this page.
The B5254T3 and B5254T7 are the two variants of the 2.5-litre white block five-cylinder, shared with the Ford JZDA four-cylinder of the Focus RS. This is the page offering the widest brand choice in the whole tree. Forged pistons are available from WÖSSNER in an 83mm bore and from JE PISTONS in FSR execution in an 83.5mm bore, both at an 8.5:1 compression ratio. Forged connecting rods are offered from ZRP and from BOOSTLINE depending on the variant chosen. To these is added an uprated VIBRA-TECHNICS torque mount for the C30 and S40 with the T5 engine, which limits powertrain movement under high torque.
The B6284T adds one cylinder to the modular family and takes capacity to 2.8 litres without changing the bore: the 81mm of the five-cylinder returns, but across six pistons. That detail governs this page. The WISECO forged piston kit therefore ships as a set of six, at an 8.5:1 compression ratio. The ZRP forged connecting rods follow the same logic, as a set of six, with their ARP2000 bolts taking up the tensile load at the end of the exhaust stroke. Nothing else is attached to this page: no bearings, no head gasket, no studs. The rod set is also listed on the VOLVO S80 T6 2.8 vehicle page.
The B8444S is the only V8 in this tree, a 4.4-litre thirty-two-valve unit developed with Yamaha and a long way from the four and five-cylinder engines that make up the rest of the Volvo range. NSB Concept currently lists a single part for it, but the one that governs any build: the WISECO forged piston kit, 94mm bore, 8.7:1 compression ratio. That is the largest bore in this whole tree, and it follows directly from the geometry of the vee block. No connecting rods, big end bearings or head gaskets are listed for this engine. The quantity supplied follows the V8 layout: check it in the listing before ordering.
The 2.3-litre VOLVO 740 runs an engine from the red block series, which explains what you find here. The bottom end is covered on two fronts: ZRP forged connecting rods, available in a 152mm and a 158mm length with their ARP2000 bolts, and a standard size set of KING RACE tri-metal big end bearings whose listing also covers the B200, B204, B23 and B234 blocks. One warning before you order: the address of this page promises forged pistons, yet none is on sale here today. Piston kits for this car sit on the 2.3L 8v B230 and 2.3L 16v B234F engine code pages, one per cylinder head type.
The VOLVO 850 is the only page in this tree that opens onto valve timing as much as onto the bottom end. Two items are on sale here. The ZRP forged connecting rod set is calculated for the 2.3L 20V turbocharged B5234T five-cylinder, the one fitted to the 850 and the C70 T5, and comes with its ARP2000 bolts. The CATCAMS forty-two-tooth adjustable camshaft pulleys, sold as a pair, address the 850 and V70 in 2.3 and 2.4 ten-valve form: they allow each camshaft to be dialled in precisely, an adjustment the standard pulley rules out. No forged piston is currently on sale on this page.
The VOLVO 940 follows the 740 without changing its bottom end: it is the same 2.3-litre red block, so the live catalogue is identical. The whole question on this page is rod length. ZRP offers two centre distances, 152mm and 158mm, and that choice is not arbitrary: it depends on the piston and the crankshaft stroke you have settled on, because centre distance plus half the stroke plus compression height has to add up. Check those three dimensions before ordering. Both sets come with their ARP2000 bolts. KING RACE tri-metal big end bearings are offered in standard size.
This vehicle page currently offers a single item, and it is not an internal part: the uprated VIBRA-TECHNICS torque engine mount, intended for the Volvo C30 and S40 fitted with the T5 block. Its job is to limit powertrain movement under high torque, once a build goes beyond what the deliberately soft standard mount can absorb. Nothing else is on sale here for the time being. For the rotating assembly of a C30 in T5 form, meaning the WÖSSNER or JE PISTONS forged pistons and the ZRP or BOOSTLINE forged rods, head for the 2.5L 20v B5254T3/T7 engine code page.
The VOLVO S80 T6 runs the 2.8-litre B6284 straight-six, a transverse block derived from the modular family. A single part is on sale on this vehicle page today: the set of six ZRP forged connecting rods, supplied with its ARP2000 bolts. The product name in fact quotes only the B6284 engine code and the brand, without naming the S80: what counts is the code stamped on the block, not the plate on the car. To complete the assembly with WISECO forged pistons in 81mm, go to the 2.8L 24v B6284T engine code page, which brings both part families together side by side.
This page covers the first-generation VOLVO V40 and S40 in 1.9 T4 form, whose turbocharged four-cylinder carries the B4194 and B4204T codes. A single item is on sale here: the ZRP forged connecting rod set, supplied with its ARP2000 bolts. One precaution applies before ordering, because the S40 name was carried over to a second generation whose T5 engine has nothing in common with this one. Read the code stamped on your own block rather than relying on the model name alone. The matching WISECO forged pistons, in an 81mm bore, are listed on the 1.9L 16v B4194T engine code page.
The B5254T4 is the 2.5-litre, twenty-valve five-cylinder of Volvo's modular engine family. NSB Concept lists its connecting rod bearings here: a set of 10 half shells for the five rods, in ACL Race Series (6B7880H) and King XP (CR509XP) or XPC (CR509XPC), from standard size up to +0.50mm depending on the part number. The same page also covers the B5204T2 and the Ford Focus RS and ST 2.5L 20v. No rods, pistons or head gaskets are listed on this page.
