wet stacking

noun

The condition or practice of passing unburned fuel out of the exhaust system of a (diesel) vehicle, for example due to idling the engine for long intervals, which does not generate enough heat for a complete burn.

Meanings

nounwet stacking (uncountable)
  1. uncountableThe condition or practice of passing unburned fuel out of the exhaust system of a (diesel) vehicle, for example due to idling the engine for long intervals, which does not generate enough heat for a complete burn.

    Figure 5 shows the effects of the wet stacking phenomenon on the D-G exhaust pipe. When the D-G sets work in the underloaded mode, piston rings do not expand sufficiently to properly seal the space between the piston and the cylinder[…]

    2019 December 17, Štefan Medvecký, Slavomír Hrček, Róbert Kohár, František Brumerčík, Viera Konstantová, Current Methods of Construction Design: Proceedings of the ICMD 2018, Springer Nature, →ISBN, page 403
    2 more examples

    Wet stacking simply means that unburned fuel is leaving the cylinder and going into the exhaust manifold and out the […] Wet stacking also forces unburned fuel past the piston rings and into the engine oil, causing fuel dilution of the lube[…]

    2007 June 22, Ben Evridge, Practical Boat Mechanics: Commonsense Ways to Prevent, Diagnose, and Repair Engines and Mechanical Problems, McGraw Hill Professional, →ISBN, page 32

    Operating diesel engines repeatedly or for prolonged periods of time without load can cause wet stacking of unburned diesel fuel oil in the exhaust system. Wet stacking can lead to other diesel engine problems, including explosions in[…]

    2021 February 17, Peter M. Curtis, Maintaining Mission Critical Systems in a 24/7 Environment, John Wiley & Sons, →ISBN, page 207
Cite this entry
APA

wet stacking. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/wet%20stacking

MLA

“wet stacking.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/wet%20stacking. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “wet stacking,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/wet%20stacking.

Source: wet stacking on Wiktionary, CC BY-SA 4.0.