WPC TREATMENT

In recent years, WPC treatment is an epoch-making surface treatment that is deeply related to internal combustion engines.

From the viewpoint of the processing technology cultivated over many years, NAPREC can guide you in selecting the correct processing content, so please feel free to contact us regarding processing for any part.

In particular, it will be possible to bring out the effects of WPC by synchronizing it with the processing of the internal combustion engine.

WPC treatment can be broadly divided into two types: slidability improvement (standard treatment) and fatigue strength improvement (strengthening treatment). Furthermore, it is composed of high-purity molybdenum disulfide without any additives to the surface layer of the main body. We will execute the treatment by accurately selecting (or combining) the four items of the original molybdenum shot that can be done and the SMAP treatment that can make the WPC treatment surface layer more stable.

There are a wide variety of parts that can be processed, but we will mainly guide you to the prices of typical parts that are likely to be processed in synchronization with engine processing.

*Unit: \(JPY)
*The price does not include tax.

Head-related
* For pistons, refer to the piston table below.

Product	Size	Unit	WPC	Molybdenum Shot	WPC + Molybdenum	Comments
Piston	See table below
Piston pin	Uniform	One	–	–	1,300
Piston ring	Uniform	One	–	–	700	Expander is not processed.
Rocker arm	Whole processing	One Piece	1,600	–	2,400	WPC + SMAP processing (MOS2 processing is not performed)
Rocker shaft	Less than 200 mm in length	One	1,820	–	2,730
Rocker shaft	Length 200 mm or more	One	2,860	–	4,290
Valve lifter	Diameter less than φ40	One Piece	1,100	–	1,650
Valve lifter	Diameter φ40 or more	One Piece	1,560	–	2,340
valve	Whole processing	One	1,800	–	2,700
Retainer	Uniform	One Sheet	900	–	–
Metal (common to parents and children)	Uniform	One Sheet	–	–	550
Thrust metal	Uniform	One Sheet	–	–	650
Connecting rod	Uniform	One	5,200	–	7,800
Crankshaft	In-line 4-cylinder Whole	One	37,700	–	55,250
Crankshaft	In-line 6-cylinder Whole	One	53,300	–	78,650
Oil pump gear	Uniform	One Car	–	–	8,000	WPC + tin combined processing

Piston Height↓	50φ	60φ	70φ	80φ	90φ	100φ	110φ	120φ
50mm	2,600	3,120	3,640	4,160	4,420	4,940	5,460	5,980
60mm	3,120	3,640	4,160	4,940	5,460	5,980	6,500	7,280
70mm	3,640	4,160	4,940	5,720	6,240	7,020	7,800	8,320
80mm	4,160	4,940	5,720	6,500	7,280	8,060	8,840	9,620
90mm	4,420	5,460	6,240	7,280	8,060	8,840	9,880	10,660

*HOW TO READ THE TABLE:
For example, in the case of RB26 genuine piston ⌀86 x height 55.6, the piston table adapts to ⌀90 60mm and costs ¥ 6,006.

* OTHER PROCESSABLE PARTS:
Cylinder block, cylinder head, camshaft, head (stud) bolt, connecting rod bolt, and other functional bolts, mission gear, synchro, shift forks, mission case, differential gear, pinion shaft. Please feel free to contact us regarding WPC processing such as drive shafts.

* PLEASE NOTE:
For WPC processing requests of 16,500 yen or less, a handling fee of 1,650 yen will be charged.

● “WPC” and “WPC processing” are registered trademarks of Fuji Machine Sales Co., Ltd. and Fuji Seisakusho Co., Ltd.