
| ENGINE BEARINGS | ||
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MAIN BEARING SET |
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| Part# | ||
| 5M8309H |
5M8309HX |
|
| Sizes | STD, .025, .25, 0.5 | STD |
| Oil Clearance | Standard | + 0.001" Extra |
| Half Type | Identical Halves | |
| Material | Tri-Metal | |
| Min Std Shaft Size |
2.3616in / 59.984mm |
|
| Max Std Shaft Size |
2.3622in / 60mm |
|
| Min Std Tunnel Size |
2.5197in / 64mm |
|
| Max Std Tunnel Size |
2.5205in / 64.02mm |
|
| Max Wall at Crown |
0.0789in / 2.005mm |
0.0784in / 1.992mm |
| Max Overall Length |
0.748in / 19mm (8297H/HX) 0.5953in / 15.12mm (8298H/HX) 0.9035in / 22.95mm (8309H/HX - Flange) |
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| Notes | Thrust in #5 pos. | |
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Diagram |
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Length: 1784mm
Width: 27mm
Number of tooth: 223
Gates' timing belts offer a precision fit with easy installation and no interference engine damage - exactly what you've come to expect from the worldwide leader in timing belts.
- Tensile cord reinforced with premium, high-strength glass cords.
- Gripping teeth with aramid fiber technology and high saturation HNBR elastomeric composites for exceptional durability and heat resistance.
- Wear-resistant tooth jacket supported by reinforced nylon fabric and double-tooth stability.
The superior construction of Gates timing belts makes them 300 percent stronger than the standard aftermarket belt while providing up to three times the heat resistance.

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| Quantity | 4 | ||||||
| Crankshaft | 51.999 / 51.984 | ||||||
| Housing | 55.001 / 55.019 | ||||||
| Max Wall | 1.501 | ||||||
| Max Length | 16.500 |

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Product detailed specification |
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|
Bore size |
99.75mm |
|
Stroke |
79.00mm |
|
Wiseco compression ratio (CR) |
9.0:1 |
|
OEM compression ratio (CR) |
8.0:1 |
|
Dome volume (CC) |
-19cm3 |
|
Compression height (CH) |
30.70mm |
|
Pin diameter |
23mm |
|
Fits for |
Subaru WRX STI 2.5 (EJ257) |
Armor Plated wiseco pistons have almost a bronze colored tint to the top of the piston and the wrist pin bore. Wiseco's Armor Plating is an abrasion resistant plating that raises the hardness of the aluminum, increases the durability of the ring grooves, prevents micro-welding of the piston rings, reduces carbon buildup and combats corrosion caused by detonation. Wiseco's most popular pistons now include Armor Plating.

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Product detailed specification |
|
|
Bore size |
99.50mm |
|
Stroke |
79.00mm |
|
Wiseco compression ratio (CR) |
9.0:1 |
|
OEM compression ratio (CR) |
8.0:1 |
|
Dome volume (CC) |
-19cm3 |
|
Compression height (CH) |
30.70mm |
|
Pin diameter |
23mm |
|
Fits for |
Subaru WRX STI 2.5 (EJ257) |
Armor Plated wiseco pistons have almost a bronze colored tint to the top of the piston and the wrist pin bore. Wiseco's Armor Plating is an abrasion resistant plating that raises the hardness of the aluminum, increases the durability of the ring grooves, prevents micro-welding of the piston rings, reduces carbon buildup and combats corrosion caused by detonation. Wiseco's most popular pistons now include Armor Plating.

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Product detailed specification |
|
|
Bore size |
100mm |
|
Stroke |
79.00mm |
|
Wiseco compression ratio (CR) |
9.0:1 |
|
OEM compression ratio (CR) |
8.0:1 |
|
Dome volume (CC) |
-19cm3 |
|
Compression height (CH) |
30.70mm |
|
Pin diameter |
23mm |
|
Fits for |
Subaru WRX STI 2.5 (EJ257) |
Armor Plated wiseco pistons have almost a bronze colored tint to the top of the piston and the wrist pin bore. Wiseco's Armor Plating is an abrasion resistant plating that raises the hardness of the aluminum, increases the durability of the ring grooves, prevents micro-welding of the piston rings, reduces carbon buildup and combats corrosion caused by detonation. Wiseco's most popular pistons now include Armor Plating.

Springs data:
Seat pressure - 82lbs @ 34.25mm
Open (lift) pressure - 220lbs @ 11.5mm
Spring coil bind - 20.70mm
Rate - 12.10lbs/mm
Max lift - 13.50mm
Outer spring outer diameter: 27.50mm
Outer spring inner diameter: 20.00mm
Inner spring outer diameter: 20.00mm
Inner spring inner diameter: 15.20mm
Set includes:
Dual springs: 16 pcs. SPR-TS1015/SU4
Titanium retainers: 16 pcs. RET-TS60/WRX1
Seats: 16 pcs. SEAT-TS/SUB4

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Product detailed specification |
|
|
Bore size |
99.75mm |
|
Stroke |
79.00mm |
|
JE Pistons compression ratio (CR) |
8.5:1 |
|
OEM compression ratio (CR) |
8.0:1 |
|
Dome volume (CC) |
-16.9cm3 |
|
Compression height (CH) |
30.70mm |
|
Pin diameter |
23mm |
|
Features |
Accepts Turbo and Nitrous; FSR series Skirt |
|
Fits for |
Subaru Impreza WRX STI - 2.5 16V (EJ257) |

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| Quantity | 1 | 2 | 2 | ||||||||||||||||||
| Crankshaft | 60.000 / 59.985 | 60.000 / 59.985 | 60.000 / 59.985 | ||||||||||||||||||
| Housing | 64.000 / 64.021 | 64.000 / 64.021 | 64.000 / 64.021 | ||||||||||||||||||
| Max Wall | 2.004 | 2.004 | 2.004 | ||||||||||||||||||
| Max Length | 22.962 | 18.999 | 15.113 |

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| Quantity | 1 | 2 | 2 | ||||||||||||||||||
| Crankshaft | 60.000 / 59.985 | 60.000 / 59.985 | 60.000 / 59.985 | ||||||||||||||||||
| Housing | 64.000 / 64.021 | 64.000 / 64.021 | 64.000 / 64.021 | ||||||||||||||||||
| Max Wall | 2.004 | 2.004 | 2.004 | ||||||||||||||||||
| Max Length | 22.962 | 18.999 | 15.113 |

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Part number starting with 330 |
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Athena advantages |
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Reinforced material |
Asbestos free composite raw material OE approved |
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Stainless steel ring (AISI304) |
Separate stainless steel rings assure maximum sealing around cylinder bore also on NOS and/or turbo charged engine where boost is over 2 bars. No head and block machining required |
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Silicon beading |
Silicon-based beading is applied on critical areas to improve sealing around all cooling water and oil passages |