ACL STD High Performance Main Bearing Set for VW/Audi 1781cc/1984cc #5M1644H-STD
Description
BRAND NEW IN BOX
5M1644H-STD;
ENGINE BEARINGS
CON ROD BEARING SET MAIN BEARING SET Part# Part# 4B1606H 5M1644H Sizes STD, .025, .25, .50 STD, .25, .50 Oil Clearance Standard Standard Half Type Identical Halves Upper & Lower Material Tri-metal Hardened steel backs Tri-metal Min Std Shaft Size 1.8802in / 47.758mm 2.1243in / 53.958mm Max Std Shaft Size 1.8810in / 47.778mm 2.1251in / 53.978mm Min Std Tunnel Size 1.9921in / 50.600mm 2.3228in / 59.000mm Max Std Tunnel Size 1.9929in / 50.619mm 2.3236in / 59.019mm Max Wall at Crown 0.0553in / 1.405mm 0.0985in / 2.502mm Max Overall Length 0.748in / 19.00mm 0.728in / 18.49mm Notes contains one oil hole Set contain 6 x 1648H and 4 x 1644H shells. Use 1648H shell in #4 position as upper and lower.
One often overlooked part when building an engine is the bearings. Getting a quality set of bearings can directly determine the longevity of your engine. We prefer to use ACL Race Bearings in all of our cars, and suggest them to all of our customers as well.
ACL Race Series Performance Engine Bearings
The unique combination of design, metallurgy and engineering come together to deliver what drivers expect from high performance Trimetal engine bearings. Designed to withstand higher RPM conditions
Features:- High strength overlay plate with reduced thickness for improved fatigue properties
- Hardened steel backs on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing.
- Increased crush for improved bearing retention
- Elimination of flash plating on the back of the bearings to improve heat transfer through the bearings and to maximize the grip between the bearings and its housing.
- Increased eccentricity to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films.
- 3/4 grooved Main Bearings to optimize bearing load carrying surface area and oil flow to the conrod bearings.
- Tight consistent wall tolerances to help you maintain consistent clearances.
- Enlarged ID chamfers on bearing edges where required to accommodate large fillet radius on performance crankshafts.
| ENGINE BEARINGS | |||
| CON ROD BEARING SET | MAIN BEARING SET | ||
| Part# | Part# | ||
| 4B1606H | 5M1644H | ||
| Sizes | STD, .025, .25, .50 | STD, .25, .50 | |
| Oil Clearance | Standard | Standard | |
| Half Type | Identical Halves | Upper & Lower | |
| Material | Tri-metal Hardened steel backs | Tri-metal | |
| Min Std Shaft Size | 1.8802in / 47.758mm | 2.1243in / 53.958mm | |
| Max Std Shaft Size | 1.8810in / 47.778mm | 2.1251in / 53.978mm | |
| Min Std Tunnel Size | 1.9921in / 50.600mm | 2.3228in / 59.000mm | |
| Max Std Tunnel Size | 1.9929in / 50.619mm | 2.3236in / 59.019mm | |
| Max Wall at Crown | 0.0553in / 1.405mm | 0.0985in / 2.502mm | |
| Max Overall Length | 0.748in / 19.00mm | 0.728in / 18.49mm | |
| Notes | contains one oil hole | Set contain 6 x 1648H and 4 x 1644H shells. Use 1648H shell in #4 position as upper and lower. | |
One often overlooked part when building an engine is the bearings. Getting a quality set of bearings can directly determine the longevity of your engine. We prefer to use ACL Race Bearings in all of our cars, and suggest them to all of our customers as well.
ACL Race Series Performance Engine Bearings
The unique combination of design, metallurgy and engineering come together to deliver what drivers expect from high performance Trimetal engine bearings. Designed to withstand higher RPM conditions
Features:
- High strength overlay plate with reduced thickness for improved fatigue properties
- Hardened steel backs on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing.
- Increased crush for improved bearing retention
- Elimination of flash plating on the back of the bearings to improve heat transfer through the bearings and to maximize the grip between the bearings and its housing.
- Increased eccentricity to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films.
- 3/4 grooved Main Bearings to optimize bearing load carrying surface area and oil flow to the conrod bearings.
- Tight consistent wall tolerances to help you maintain consistent clearances.
- Enlarged ID chamfers on bearing edges where required to accommodate large fillet radius on performance crankshafts.
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If you have any issue with your transaction, before filing any dispute, please contact us to resolve and we will do our best to resolve the issue through eBay as soon as possible. Please contact us if you have any question.