Tomei 1231N1101B Upper Inner Main Bearing RB25/RB26 GRADE 1 Image1
 
Images are generic.
 

Tomei Upper Inner Main Bearing RB25/RB26 GRADE 1

 
  • Superior abrasian resistance

  • Improves the heat transfer

  • High loads and temperatures


Tomei 1231N1101B Upper Inner Main Bearing RB25/RB26 GRADE 1
List Price: $21.00
$20.58
Product is available for order
Shipping times depend on manufacturer availability
Usually ships in 2-3 days

Product Details

When tuning engines for higher power output and high RPM the bearings are subjected to extreme load conditions. These harsh conditions require the bearings to be able to cope with excessive loads and stress conditions. The TOMEI Competition Bearing series are designed for fatigue resistance, durability, effective lubrication and resistance to scoring. Designed for use on engines that will be outputting 1,000 HP and at over 10,000RPM. These advanced designed bearings are suitable for the serious professionals in mind whom need results.

 

PRICE IS FOR EACH BEARING

 

MAKER
ENGINE

MODEL

APPLICATION
GRADE
SIZE
GRADE
COLOR
NOTES
OEM
GRADE
PART NO.
QTY Required
Per Engine
NISSAN
RB26DETT
RB25DE(T)
R32
R33
R34
Main
Inner
Upper
A
1.818-1.821
Black
0
1231N1101A
6 pcs
B
1.821-1.824
Green
1
1231N1101B
C
1.824-1.827
Yellow
2
1231N1101C
D
1.827-1.830
Red
3
1231N1101D
Lower
A
1.818-1.821
Black
0
1231N1201A
6 pcs
B
1.821-1.824
Green
1
1231N1201B
C
1.824-1.827
Yellow
2
1231N1201C
D
1.827-1.830
Red
3
1231N1201D
Main
Center
Upper
A
1.818-1.821
Black
0
1231N2101A
1 pc
B
1.821-1.824
Green
1
1231N2101B
C
1.824-1.827
Yellow
2
1231N2101C
D
1.827-1.830
Red
3
1231N2101D
Lower
A
1.818-1.821
Black
0
1231N2201A
1 pc
B
1.821-1.824
Green
1
1231N2201B
C
1.824-1.827
Yellow
2
1231N2201C
D
1.827-1.830
Red
3
1231N2101D
Conrod
 
A
1.500-1.503
Black
0
1232N0001A
12 pcs
B
1.503-1.506
Green
1
1232N0001B
C
1.506-1.509
Yellow
2
1232N0001C

 

Materials:

  • OVERLAY (P76 Material)
    The P76 material is used for it's superior abrasion and fatigue resistance. The elimination of the tin flash plating improves the heat transfer through the bearing.
  • F781 Material
    The F781 material is used on connecting rod bearings for high performance engines. It has a hardened steel backing to improve the support of the bearing lining and assist bearing retention in the housing.
  • The combination of these material enhancements optimize bearing performance under high loads and temperatures.

Crush:

  • The Competition Bearing Series are designed with an increased crush (i.e. extra bearing length of typically 0.100-0.175mm). The extra crush improves the retention of the bearing in it's housing.
  • Crush Height: The crush height is based on the bearing being a fraction longer than the housing seating so that a small section protrudes above the rod bore parting surface. When the rod halves are drawn together, the inserts touch before the halves, thus forcing the inserts tightly into place.

Eccentricity:

  • The wall thickness at the crown of the shell is thicker than the wall at 3/8" down from the parting face. These Competition Bearing Series have an increased amount of eccentricity to compensate for the bearing housing bore elongation in extreme conditions and to help create an effective hydrodynamic oil film.

Notches:

  • The Notches help with bearing alignment during fitment. They do not hold the bearings in place during operation, that is the function of “Crush”.

Bored Surface:

  • The bore bearing surface finish method helps promote effective oil flow and to maintain adequate lubrication for both the bearings and other moving parts.

Oil Grooves:

  • The design of the oil grooves on the lower main bearing shell is always a trade off between oil supply to the Conrods and the bearings load carrying capacity. These TOMEI Competition Bearings generally have a 3/4 groove to give optimum balance of oil flow whilst keeping optimum load carrying capacity.

Product Reviews and Ratings

This product has no reviews at the moment.

Have a review for this product? Sign in to leave a review


 

Vehicle Applications

Years Make Model Trim Chassis Engine Notes
1995 - 1998 Nissan Skyline   (R33) RB25DE  
1989 - 1994 Nissan Skyline   (R33) RB25DET  
1999 - 2003 Nissan Skyline NEO (R34) RB25DE  
1999 - 2003 Nissan Skyline NEO (R34) RB25DET  
1989 - 1994 Nissan Skyline GT-R   (R32) RB26DETT  
1995 - 1997 Nissan Skyline GT-R   (R33) RB26DETT  
1999 - 2002 Nissan Skyline GT-R   (R34) RB26DETT