Newland 4340 Billet Steel 79mm 83mm Stroke Crankshaft for Subaru EJ25 EJ255 EJ257 2.5L Engine Crank

Product Overview

Description

Newland 4340 Billet Steel 79mm 83mm Stroke Crankshaft for Subaru EJ25 EJ255 EJ257 2.5L Engine Crank

 

 

  Quick Detail

 

Material	4340 Billet (40CrNiMoA steel)
Date of Delivery	About 90 to 100 days after sizes are confirmed
Application	for Subaru EJ255/EJ257 engine

 

 

     Dimension

 

 

Stroke	79mm / 83mm / cusstomized
Crank Pin	***mm
Main	***mm

 

 

 

NLGROUP  DESIGN  

 

 

customized design counterweight                        Pendulum Undercut Counterweight

 

   

 

Knife Edge Counterweights                                      Oil Groove Counterweights

 

     

 

Knife Edge Counterweights                                   Tapered Counterweights

 

       

 

Lighten Holes at Rod Journals                                           

 

 

 

 

Technical Features

 

 

 

• Materials:40CrNiMoA  Heating treatment:HRC34-38

• Crankshaft will get thermal refining after normalizing,HRC34-38.The difference will be within 4HRC on same one cranks

 

• No over burning,carbon-free surface layer is within 0.3mm 

 

• Folding,oilet,cracks, oxidation and other things is not permitted for Cranks macrostructure.

• Balance weight value need keep 0-20g.cm on counterweight of big end and small end

 

• Peening treatment will be done after balance weight 

• Nitrogen treatment will be done after precision grind,compound layer depth is 0.008mm after polishing.diffusion layer is over 0.3mm,hardness on surface is not less than 500HV.

• No damage,scallops and other visible disadvantage on surface.

 

• Crankshaft will be cleaned up to make sure there is no filings in oil hole.

 

• magnetic flaw detecting will be done according to standard JB/76729-93

 

• Other size tolerance :standdars GB1804-79  IT14,No marked place  roughness:Ra6.3

 

 

 

Processing & Packaging