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Real live but very old data. Overall trans efficiency for a 1L side valve, 33.7bhp@4600rpm, 7cwt van, direct top 4 speed, wide open throttle. As it's direct top, there is no meshing loss in the gearbox, only the diff. Both diff and gearbox have oil fling. Chance of gears being superfinished NIL...

It reduces power needed to accelerate the drive line. It has most effect in 1st, less in 2nd gear ratio, not a lot in 3rd and nearly no effect in top or overdrive. It has no effect on constant speed running as drivetrain is not accelerating. It has most effect on fast running parts like the...

Duct tape, they glue the tyre to the track with a strip of soft adhesive rubber they lay down in the burnout. Get the burnout right, get into stage to launch just as the tackiness reaches it's peak and mu can exceed 5 so 5G is possible. By the end of the strip where there is no rubber laid...

There are two main causes of power loss in transmissions. 1: The nice simple textbook loss due to sliding contact of the gears. Taken to be constant with speed, typically about 2% of power for spur gears and 3% for hypoid bevel. 2: The complex loss (never found in textbooks) due to oil fling...

Putting a fixed feed liquid LPG jet in would be like pulling a fuel enrichment 'choke' on (like an SU). Not usually so good for power, acceleration or economy. If 1asa has an O2 sensor and closed loop control (stepper motor mixture control or gas injection) it may lean the vapour feed to...