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  2. Hemispherical combustion chamber - Wikipedia

    en.wikipedia.org/wiki/Hemispherical_combustion...

    A hemispherical head ("hemi-head") gives an efficient combustion chamber with minimal heat loss to the head, and allows for two large valves.However, a hemi-head usually allows no more than two valves per cylinder due to the difficulty in arranging the valve gear for four valves at diverging angles, and these large valves are necessarily heavier than those in a multi-valve engine of similar ...

  3. Engine configuration - Wikipedia

    en.wikipedia.org/wiki/Engine_configuration

    Similar to U engines, H engines consist of two separate flat engines joined by gears or chains. H engines have been produced with between 4 and 24 cylinders. An opposed-piston engine is similar to a flat engine in that pairs of pistons are co-axial but rather than sharing a crankshaft, instead share a single combustion chamber per pair of ...

  4. Pent-roof combustion chamber - Wikipedia

    en.wikipedia.org/wiki/Pent-roof_combustion_chamber

    It is similar in concept to the hemi engine, both in design and purpose, but a hemispherical cylinder head is limited to only two valves without the use of a more complex sub-rocker assembly. The four-valve penta engine design was invented by Peugeot of France, [ citation needed ] to be first used in the 1911 Indianapolis 500 race.

  5. SAE J300 - Wikipedia

    en.wikipedia.org/wiki/SAE_J300

    The oil fails the test at a particular temperature if the oil is too viscous. The grade of the oil is that associated with the coldest temperature at which the oil passes the test. For example, if an oil passes at the specified temperatures for 10W and 5W, but fails at the 0W temperature, the oil is grade 5W. It cannot be labeled 0W or 10W.

  6. Polyspheric - Wikipedia

    en.wikipedia.org/wiki/Polyspheric

    The Polyspheric or Poly engines were V8 engines produced by Chrysler from 1955 to 1958 as lower-cost alternatives to the Hemi engines. [1] These engines were based on the Hemi engines, using the same blocks and crankshaft parts, but completely different cylinder heads, pushrods, exhaust manifolds and pistons.

  7. Bake Better Cookies by Avoiding These 5 Common Mistakes - AOL

    www.aol.com/bake-better-cookies-avoiding-5...

    Not bringing your ingredients to room temperature Before you preheat your oven or turn on your mixer, be sure that your ingredients are at room temperature, roughly 65° to 70°F.

  8. Yes, You Really Should Bake With Room Temperature Eggs ... - AOL

    www.aol.com/yes-really-bake-room-temperature...

    Much of the time, a recipe will provide certain cues and reminders of the places where these details of ingredient chemistry really matter, like when a recipe calls for a select number of "large ...

  9. What should you set your heat to in the winter? Avoid ... - AOL

    www.aol.com/finance/set-heat-winter-avoid...

    The Energy Department says that even turning thermostats back 7 to 10 degrees from their normal settings for eight hours a day can save as much as 10% a year on homeowners' heating and cooling ...