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2. Close-ratio transmission - Wikipedia

   en.wikipedia.org/wiki/Close-ratio_transmission

   The designation of wide versus close ratio affected the lowest gear ratio; for example, the four-speed Muncie transmissions offered in General Motors performance vehicles included the M20 "wide ratio" transmission, which had a first gear ratio of 2.52 or 2.56:1, while the M21 and M22 "close ratio" transmissions had a first gear ratio of 2.20:1.

3. Gear train - Wikipedia

   en.wikipedia.org/wiki/Gear_train

   For example, a transmission with an engine shaft to drive shaft ratio of 4:1 in first gear and 2:1 in second gear would be considered wide-ratio when compared to another transmission with a ratio of 4:1 in first and 3:1 in second. This is because the close-ratio transmission has less of a progression between gears.

4. Compression ratio - Wikipedia

   en.wikipedia.org/wiki/Compression_ratio

   For example, if the static compression ratio is 10:1, and the dynamic compression ratio is 7.5:1, a useful value for cylinder pressure would be 7.5 1.3 × atmospheric pressure, or 13.7 bar (relative to atmospheric pressure). The two corrections for dynamic compression ratio affect cylinder pressure in opposite directions, but not in equal strength.

5. ZF 6HP transmission - Wikipedia

   en.wikipedia.org/wiki/ZF_6HP_transmission

   ZF 6HP transmission. 6HP is ZF Friedrichshafen AG's trademark name for its six-speed automatic transmission models ( 6 -speed transmission with H ydraulic converter and P lanetary gearsets) for longitudinal engine applications, designed and built by ZF's subsidiary in Saarbrücken. Released as the 6HP 26 in 2000, it was the first six-speed ...

6. Overdrive (mechanics) - Wikipedia

   en.wikipedia.org/wiki/Overdrive_(mechanics)

   The gearbox was designed so that, for efficiency, the fastest ratio would be a "direct-drive" or "straight-through" 1:1 ratio, avoiding frictional losses in the gears. Achieving an overdriven ratio for cruising thus required a gearbox ratio even higher than this, i.e. the gearbox output shaft rotating faster than the engine.

7. Worm drive - Wikipedia

   en.wikipedia.org/wiki/Worm_drive

   Therefore, regardless of the worm's size (sensible engineering limits notwithstanding), the gear ratio is the "size of the worm wheel - to - 1". Given a single-start worm, a 20-tooth worm wheel reduces the speed by the ratio of 20:1. With spur gears, a gear of 12 teeth must match with a 240-tooth gear to achieve the same 20:1 ratio.