The active exhaust system gives Mustang owners the ability to change the tone of their exhaust. Here's how it works and if ...

You have likely heard of variable valve timing by one of the names manufacturers have for the system, such as VVT-i or VTEC.

Exhaust valve:0.014-in. max bounce at 7,900 rpm; tested up to 7,900 rpm. Katech notes:Minimal bounce at 7,900 rpm! This is an excellent combination all the way to 7,800 rpm—as long as the prep ...

“Active-valve performance exhaust gives Mustang owners the best of both worlds—that classic Mustang sound, and the ability to not wake up your neighbors when you leave the house early in the ...

The valves are available in a range of port sized from #10-32 to ¾-in., can operate at speeds up to 600 CPM, have a pressure range to 150 psig, and a working temperature range from −25 to +180° F.

Nevertheless, tests conducted in the mid-1970s by the U.S. Army, the Postal Service, and other large fleet operators showed unleaded gas-induced exhaust valve seat recession isn't a significant ...

Servicing Cessna 172 Stuck Exhaust Valves A rough-running engine means it’s time to pop valve covers.

The valves are available in a range of port sized from #10-32 to 3 /4 in., can operate at speeds up to 600 cpm, have a pressure range to 150 psig, and a working temperature range from –25 to 180°F.