The defining characteristic of a two-stroke engine is to fire (combust) every time the piston is at top dead center. This makes them highly power dense, but also notoriously makes two-stroke engines ...

Whether we're talking about diesel fuel or gasoline, it's hard to beat hydrocarbons for delivering energy in a potent, easy-to-handle package. Small non-hybrid gasoline engine cars already get ...

By 2013, all new models of gasoline ... the engine meets exhaust emission regulations also must be included. While more information can be added, the above is what’s required on any small ...

Gavin Newsom signed a law that will effectively ban the sale of gas-powered small ... regulations to prohibit engine exhaust and evaporative emissions from new small off-road engines." ...

This unfortunate byproduct is a result of direct injection engines' tendency to produce small ... Diesel particulate filters occasionally run a regeneration mode in which the exhaust temperature ...

Regulators and clean-air advocates are increasingly eyeing the pollution emitted by small gasoline ... released by the engines, workers are exposed directly to their exhaust and rarely wear ...

The alcohol can be stored in a small, separate fuel tank — as exhaust-cleanup fluid is stored in a diesel engine vehicle. Alternatively, it could be provided by onboard separation of alcohol from ...

Most manufacturers that are building hybrids use small gasoline engines. Why don't they use ... These must be addressed by treating exhaust gases with items like particulate filters, urea ...