Installing & Selecting Turbo for Detroit Diesel Marine Aftercooled Engines (6V92, 8V92, 12V92, 16V92) | DIESELPRO.COM

In this short but essential video, Diesel Pro Power walks you through how to select and verify the correct turbocharger for your Detroit Diesel marine aftercooled engine. Whether you’re replacing the turbo on a 6V92, 8V92, 12V92, or 16V92, it’s critical to match your new turbo to the precise specifications of the existing unit for proper engine performance, boost pressure, air-to-fuel balance, and exhaust flow efficiency.

Detroit Diesel 92 Series marine engines rely heavily on properly sized and properly matched turbochargers, especially when paired with aftercoolers. A turbo that is too small will cause excessive heat, high EGTs, and reduced horsepower. A turbo that is too large may create sluggish boost response and improper power curves. Because of this, verifying the correct turbo model is one of the most important steps during a replacement.

This video focuses on how to visually confirm that you’re ordering the correct turbocharger by examining two critical measurements:

the compressor housing A/R ratio and the turbine housing A/R ratio.

These ratios determine how efficiently the turbo flows air and how responsive it will be at various engine speeds—both of which directly impact marine load performance, fuel economy, and longevity.

The featured turbo in this video includes the following specifications:

• Compressor housing A/R ratio: 0.95
• Turbine housing A/R ratio: 1.19

These measurements must match or closely align with the turbo you’re replacing. A mismatch can lead to poor spooling characteristics, overboosting or underboosting, overheating, or damage to the aftercooler and engine internals. Matching the A/R ratios ensures a seamless fit and delivers the performance curve that Detroit Diesel intended for marine applications.

Marine engines operate under constant load, especially at cruising RPM, so selecting a turbo with correct flow characteristics is even more important than on highway or industrial engines. A properly matched turbo helps maintain safe engine temperatures, stable combustion, and efficient airflow through the aftercooler and blower system, all of which help your Detroit Diesel 92 Series engine operate reliably for thousands of hours.

⚠️ Important Note

This video is for identification and reference purposes only. It does not include installation procedures, torque specifications, or safety guidelines. Turbocharger replacement affects major engine systems and must be performed correctly. Always refer to your official Detroit Diesel service manual or consult a certified marine diesel technician before installing or adjusting a turbocharger.

What You’ll Learn in This Video

• How to identify the A/R ratio markings on your existing turbo

You’ll see exactly where manufacturers stamp or cast A/R numbers on compressor and turbine housings so you can confirm correct sizing before ordering.

• Where to locate compressor and turbine housing specifications

The video walks through the physical areas of the turbo where these measurements are found, helping you avoid ordering errors.

• How to visually match your old turbo to a replacement unit

Understanding visual cues—housing shape, inlet/outlet orientation, flange types, and A/R markings—ensures the new turbo is the correct configuration for your engine setup.

• What to check before ordering a turbo for your 6V92, 8V92, 12V92, or 16V92

This includes confirming mounting flange patterns, aftercooler compatibility, oil feed and return layout, and correct marine configuration.

• Why correct turbo sizing is crucial for marine engine performance and reliability

Improper turbo sizing can affect boost levels, EGTs, cooling efficiency, horsepower output, and long-term durability—especially in marine environments where engines run at consistent loads for extended periods.

This video is a quick but valuable guide for marine diesel mechanics, vessel owners, and Detroit Diesel enthusiasts who want to correctly identify and replace a worn or damaged turbocharger without guesswork. Even experienced operators benefit from verifying A/R ratios, since slight differences between models can make a significant impact on performance.

Understanding these details helps prevent costly mistakes, ensures your engine receives the correct airflow and boost pressure, and keeps your Detroit Diesel 92 Series engine running strong whether you’re cruising offshore, powering through heavy seas, or maintaining continuous-duty operation.

Need a Turbo for Your Marine 92 Series Engine?

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