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  See all Engine products
ACL Main Bearing Set 5M1172A-STD for Nissan L16E/L18E 1595-1770CC 1968-1974 High Performance - 5M1172A-STD

Alright, let’s talk about the ACL Race Series Engine Bearings. If you’re diving into the world of high-performance engines, you know how crucial the right bearings are. These bad boys are built for the serious driver who pushes their engine to the limits. Designed with a unique blend of engineering know-how and quality materials, they’re ready to handle those higher RPMs without breaking a sweat.

So, what makes these bearings stand out? For starters, they come with a high strength overlay plate that’s thinner than what you’d typically find. This isn’t just for show; it actually enhances fatigue resistance. Plus, every rod bearing has hardened steel backs that provide solid support for the lining and help keep everything snug in the housing. No one wants a bearing that’s going to shift around under pressure.

Speaking of pressure, these bearings feature increased crush for better retention. That means they’re not going anywhere, even when you’re pushing your engine hard. And forget about flash plating on the back—ACL has eliminated that to improve heat transfer. This is a big deal because it maximizes grip between the bearings and their housing, keeping everything running smoothly.

Now, if you’re revving high, you’ll appreciate the increased eccentricity. This helps compensate for any bore distortion, allowing for the formation of hydrodynamic oil films that protect your engine. And those 3/4 grooved main bearings? They’re designed to optimize the load-carrying surface area and ensure oil flows just right to the conrod bearings.

Consistency is key in performance, and with tight wall tolerances, you’ll maintain those clearances you need for peak operation. Plus, they’ve got enlarged ID chamfers on the edges where it counts, accommodating larger fillet radii on performance crankshafts. It’s these little details that make a big difference when you’re on the track or just enjoying a spirited drive.

For the Nissan 4-cylinder folks, these are the 5M1172A-STD bearings, fitting the L16E/L18E engines from '68 to '74 with a standard size. If you’re looking to upgrade your main bearing set, these are definitely worth considering. They’re built to last and designed for the kind of performance that makes driving fun.

Other Part Numbers:
ACL #acl5M1172A-STD

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Who is ACL?

ACL is a company that specializes in manufacturing and distributing high-quality engine bearings that have played a key role in the Australian automotive parts market. 

Based in Launceston, Tasmania, Australia, the company has been in the business for more than 70 years and has become the leading brand when it comes to its market segment.

Throughout the years, ACL has consistently provided top quality products and has become the equipment supplier of multiple Automotive brands such as Lancia, Mazda, Mini, Mitsubishi, Nissan, Peugeot, Subaru, Toyota, Volvo, Suzuki, Renault, SAAB, and more.  ACL also provides a replacement product range used by the aftermarket industry.

The company ensures that it maintains its high level of standard by employing manufacturing processes that are ISO certified. They also use the industry’s most advanced tooling equipment and designing software that allows them to create products that are superior in quality. ACL has been known worldwide to create bearings that are durable, innovative, and precise.

ACL also offers bearing used for high-performance applications. The company has been involved in motorsport racing since the 1960s and has manufactured bearings used in Brabham Formula 1. Today, their products are being used in different racing disciplines such as the Australian Supercar Championship, Drag racing, Driftings, and Rally.

Purchase ACL Bearings at Vivid Racing

Engine Bearings are a critical component of a vehicle and should not be overlooked. If you want to make sure that what you get is something you could rely on, then ACL is the brand for you. With over 200 engine applications, whether it’s an American, Australian, European, or Asian made vehicle, ACL got you covered. Visit Vivid Racing and check out their list of bearings that would fit your specific needs.

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