Engine & Exhaust / Tech / Tech Articles

How it Works: Blow-Off Valves


The guys over a Power AutoMedia have launched a new site dedicated strictly to diesels and diesel owners. The site, named Diesel Army, includes tech, diesel features, diesel-related news, and a section called “How it Works.”

In the first installment of How it Works, Diesel Army covers the ins and outs of blow-off valves.

The blow-off valve (BOV) is an essential component of the turbocharger systems. Its purpose is to release the excess pressure built up within the turbo system after you suddenly let off the throttle. By reducing this pressure, the BOV eliminates compressor surge and greatly minimizes the stress on turbo components in the process. The BOV also has performance advantages, too, allowing your turbo to come back to full boost more quickly.

The Diesel Army article goes into detail on BOV performance advantages and does a great job of explaining BOV anatomy and how a typical blow-off valve works. It also touches on why BOVs are essential for turbocharged gasoline-powered engines, too. Whether you’re part of the diesel army or you drive a turbo four-cylinder compact, you should definitely give the article a read.



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