
|
Product detailed specification |
|
|
Bore size |
84.50mm |
|
Stroke |
75.00mm |
|
Wiseco compression ratio (CR) |
8.8:1 |
|
OEM compression ratio (CR) |
8.8:1 |
|
Dome volume (CC) |
-6.8cm3 |
|
Compression height (CH) |
34.70mm |
|
Pin diameter |
22mm |
|
Features |
Accepts Turbo and Nitrous, Round piston skirt |
|
Fits for |
BMW - 2.5 12V (M20B25) |

Spring data:
Seat pressure - 82lbs @ 37.00mm
Open (lift) pressure - 180lbs @ 10mm
Spring coil bind - 24.90mm
Max lift - 11.90mm
Rate - 10.20lbs/mm
Spring outer diameter - 24.00mm
Spring inner diameter - 16.50mm
Set includes:
Single springs - 16 pcs.
Titanium retainers - 16pcs.



| Sizes | STD, .025, .25, .50 |
| Oil Clearance | Standard |
| Half Type | Identical Halves |
| Material | Tri-Metal |
| Min. Std Shaft Size | 2.3616in / 59.984mm |
| Max. Std Shaft Size | 2.3622in / 60.000mm |
| Min. Std Tunnel Size | 2.5197in / 64.000mm |
| Max. Std Tunnel Size | 2.5205in / 64.020mm |
| Max Wall at Crown | 0.0789in / 2.005mm |
| Max Overall Length | 0.7480in / 19.00mm (8297H/HX) 0.5953in / 15.12mm (8298H/HX) 0.8642in / 21.95mm (8299H/HX - Flange) |
| Weight | 0.31 |
| Notes | Thrust in #3 pos. |




| Flat Diaphragm | Rolled Diaphragm | |
| Clamping Force | 1300kg | 1300kg |
| Torque Rating | 1800Nm | 1800Nm |
| Bearing Contact Diameter | 65mm | FLAT BEARING |
| Bearing Load (@ 48mm) | 180kg | 150kg |
| Release Travel Required | 7mm | 7mm |
| Assembly Mass (without flywheel) | 8.30kg | 8.30kg |
| Disc Set Static Mass | 2.25kg | 2.25kg |
| Friction Thickness New | 8mm (0.315") | 8mm (0.315") |
| Friction Thickness Worn | 7.5mm (0.295") | 7.5mm (0.295") |





|
Product detailed specification |
|
|
Bore size |
81.00mm |
|
Stroke |
86.40mm |
|
JE Pistons compression ratio (CR) |
8.5:1 |
|
OEM compression ratio (CR) |
9.5:1 |
|
Dome volume (CC) |
-8.1cm3 |
|
Compression height (CH) |
32.66mm |
|
Pin diameter |
20mm |
|
Features |
Accepts Turbo and Nitrous, Round piston skirt |
|
Fits for |
VAG - 1.8T 20V |

| ENGINE BEARINGS | ||
![]() |
MAIN BEARING SET |
|
| Part# | ||
| 5M1186H |
5M1186HX |
|
| Sizes | STD,.025, .25 | STD |
| Oil Clearance | Standard | + 0.001" Extra |
| Half Type | Upper & Lower | |
| Material | Tri-Metal | |
| Min Std Shaft Size |
2.2435in / 56.985mm |
|
| Max Std Shaft Size |
2.2441in / 57mm |
|
| Min Std Tunnel Size |
2.4016in / 61mm |
|
| Max Std Tunnel Size |
2.4024in / 61.021mm |
|
| Max Wall at Crown |
0.0783in / 1.99mm |
0.0778in / 1.977mm |
| Max Overall Length |
0.8268in / 21mm (1186H/HX) 1in / 25.4mm (1187H/HX - Flange) |
|
| Notes | ||
|
Diagram |
1186H & HX - Positions 1, 2, 4, 5
1187H & HX - Position 3
|
|