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The image displays the title 'FATAL FLAWS Understanding the piston crackers' in white text on a dark, textured background, with a black, circular engine piston at the bottom.
This image lists 'THE MOST COMMON' diesel engines prone to piston cracking: LML Duramax, LBZ/LMM Duramax, and 6.4 Powerstroke, accompanied by images of trucks representing each model.
The image highlights 'BAD DESIGN' in the LBZ/LMM Duramax piston, showing two trucks and close-ups of a piston with a brass wrist pin insert, which is identified as a design flaw causing cracks.
The image features a 'PIEZO DURAMAX' truck, a piezo injector, and a piston, explaining that this Duramax, despite being strong, still cracks pistons due to its piezo injectors.
The image focuses on 'THE 6.4 POWERSTROKE,' showing a truck, a piezo injector, and a piston, questioning why these engines are notorious for cracking pistons despite seemingly stronger designs.
This image is a text-only slide explaining 'PIEZO VS SOLENOID' injectors. It details how piezo injectors' faster opening speed creates a stronger flame front and heat load on the piston lip, leading to cracks.
The image asks 'EXCEPTION?' regarding the 6.7 Powerstroke, showing a red truck and a piezo injector. It notes that this diesel, despite having piezos, is not known for cracking pistons.
The image explains the 'BETTER PISTON' design of the 6.7 Cummins. It shows a piston without the infamous lip, which prevents heat accumulation and cracking, even with advanced timing.
The image concludes with 'DOESN'T MEAN BAD,' showing two trucks, an injector, and a piston. It advises caution and understanding when dealing with these engines, emphasizing their strength despite piston cracking issues.
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Understanding the piston cracking diesels

2025/2/17 Edited to

... Read morePiston cracking in diesel engines is a common yet critical issue, affecting models like the GM Duramax series. Notably, the LML and LBZ engines are notorious for cracking due to design flaws where insufficient piston material was used. The introduction of brass inserts aimed to enhance durability but led to unexpected failures at higher horsepower levels. Similarly, while the 6.4 Powerstroke appears robust, it too suffers from cracking issues. A key factor contributing to these failures is the type of fuel injectors used. Many diesel engines operate with solenoid injectors, but newer models like some Duramax systems have transitioned to piezo injectors, which function faster and can result in a stronger flame front. This increased heat load significantly raises the risk of cracking. Interestingly, the 6.7 Cummins engine stands out for its superior piston design, which mitigates the typical cracking issues seen in its counterparts. It does not have the adverse lip design that allows heat to build up, thus preventing cracks. Diesel performance enthusiasts should remain aware of the potential for cracking but also recognize that with proper understanding and care, these engines can perform exceptionally well without major issues.