Check Your Vehicle's LS Main Bearing Clearance for Optimal Engine Performance**

Proper LS main bearing clearance is crucial for the longevity and efficiency of your engine. In this article, we'll provide valuable insights into this critical aspect of engine maintenance, highlighting industry-leading practices, common pitfalls, and effective strategies to ensure optimal engine performance.

Understanding LS Main Bearing Clearance

LS main bearing clearance refers to the precise gap between the crankshaft main bearings and the crankshaft journals. Maintaining the correct clearance ensures proper lubrication, reduces friction, and prevents premature bearing failure. The ideal clearance varies depending on the specific engine model and operating conditions.

Clearance Range	Application	Reference Source
0.0025" - 0.0035"	Performance engines with high RPM	GM Technical Service Bulletin # 18-06-06-008C
0.0018" - 0.0035"	Street engines with mild modifications	Comp Cams Technical Article

Effective Strategies for LS Main Bearing Clearance

1. Precise Measurement:

Using accurate measuring tools like a micrometer or dial bore gauge is essential for determining precise bearing clearance.

Measurement Method	Accuracy
Micrometer	±0.0001"
Dial bore gauge	±0.0005"

2. Optimal Clearances:

Refer to the manufacturer's specifications or reputable online sources to determine the ideal bearing clearance range for your engine.

Application	Ideal Clearance
High-performance engines	0.0025" - 0.0035"
Street engines	0.0018" - 0.0035"

3. Assembly Techniques:

Proper assembly techniques, including torquing bolts to the correct specifications and using assembly lube, ensure optimal bearing clearance.

Step	Details
Crank installation	Use clean bolts and apply assembly lube
Bearing cap torquing	Follow manufacturer's torque specifications
Final clearance check	Remeasure bearing clearance after torquing

Common Mistakes to Avoid

1. Insufficient Clearance:

Too little clearance can cause increased friction, leading to premature bearing wear and engine damage.

Symptoms	Consequence
Excessive engine noise	Bearing failure
High operating temperatures	Oil starvation

2. Excessive Clearance:

Too much clearance can promote oil leaks and reduce engine efficiency.

Symptoms	Consequence
Oil leakage from main bearing caps	Reduced oil pressure
Increased engine vibration	Reduced engine lifespan

Success Stories

Case Study 1:

By optimizing the LS main bearing clearance in a high-performance racing engine, the team achieved a 20% increase in horsepower and a 15% reduction in lap times.

Case Study 2:

A street-driven vehicle experienced premature bearing failure due to insufficient clearance. After adjusting the clearance to the recommended range, the engine ran smoothly and reliably for an additional 100,000 miles.

Case Study 3:

A professional mechanic resolved persistent oil leaks and engine vibration by correcting the LS main bearing clearance. This resulted in a significant improvement in the vehicle's drivability and fuel efficiency.

Check Your Vehicle's LS Main Bearing Clearance for Optimal Engine Performance**