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  2. Mesa/Boogie Mark Series - Wikipedia

    en.wikipedia.org/wiki/Mesa/Boogie_Mark_Series

    Mesa-Boogie "Mark IV", a guitar combo amplifier The Mesa/Boogie Mark Series is a series of guitar amplifier made by Mesa Engineering (more commonly known as "Mesa/Boogie"). "). Originally just referred to as "Boogies", the product line took on the moniker "Mark Series" as newer revisions were put into produ

  3. Multi-role Electronically Scanned Array - Wikipedia

    en.wikipedia.org/wiki/Multi-role_Electronically...

    The Multi-role Electronically Scanned Array (MESA) is an active electronically scanned array surveillance radar system for the Boeing E-7 Wedgetail airborne early warning and control aircraft. The radar is produced by Northrop Grumman .

  4. Tuned exhaust - Wikipedia

    en.wikipedia.org/wiki/Tuned_exhaust

    A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head , and merge into two pipes (secondary), which in turn finally link up to form one collector pipe.

  5. Exhaust heat recovery system - Wikipedia

    en.wikipedia.org/wiki/Exhaust_heat_recovery_system

    An exhaust heat recovery system turns waste heat energy in exhaust gases into electric energy for batteries or mechanical energy reintroduced on the crankshaft. The technology is of increasing interest as car and heavy-duty vehicle manufacturers continue to increase efficiency, saving fuel and reducing emissions.

  6. Diesel exhaust - Wikipedia

    en.wikipedia.org/wiki/Diesel_exhaust

    SNCR systems have been prototyped that reduce 90% of the NO x in the exhaust system, with commercialized systems being somewhat lower. [citation needed] SCR systems do not necessarily need particulate matter (PM) filters; when SNCR and PM filters are combined, some engines have been shown to be 3-5% more fuel efficient.

  7. Vehicle emissions control - Wikipedia

    en.wikipedia.org/wiki/Vehicle_emissions_control

    While 1979 and 1980 systems are very similar, the 1981 system (2nd generation) will differ in that it may include additional engine control systems (i.e., electronic spark timing, idle speed control, etc.) The Emission Control System under development has been designated C-4.This stands for Computer Controlled Catalytic Converter.

  8. Exhaust heat management - Wikipedia

    en.wikipedia.org/wiki/Exhaust_Heat_Management

    These ceramic coatings are highly advanced coatings applied via plasma spray, and as a result, the coating is effectively welded to the surface of the exhaust system. They can offer small performance benefits [1] due to the low thermal conductivity of the ceramic compound. This reduces engine bay temperature and increases exhaust velocity.

  9. Selective catalytic reduction - Wikipedia

    en.wikipedia.org/wiki/Selective_catalytic_reduction

    DPR is a diesel particulate filtration system with regeneration process that uses late fuel injection to control exhaust temperature to burn off soot. [12] [13] Diesel engines manufactured after January 1, 2010 are required to meet lowered NOx standards for the US market.