Engine Brake
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Say for example...Switching from 4th gear say @80KMH to 2nd gear in order to slow down when near to traffic light ... is it harmful to the engine? Are there any difference in terms of petrol or diesel engine (applying "too much" engine brakes)?
Thks.... -
if me no wrong, should release accelerator, change to 3rd gear, then when slower to 2nd better.... suddenly to 2nd gear, car behind might kiss you....Originally posted by budbelly:Say for example...Switching from 4th gear say @80KMH to 2nd gear in order to slow down when near to traffic light ... is it harmful to the engine? Are there any difference in terms of petrol or diesel engine (applying "too much" engine brakes)? Thks....
Ask Heng@, he expert in cars.... -
A better range will be 60.... 80 is a bit high but is still acceptable....Originally posted by budbelly:Say for example...Switching from 4th gear say @80KMH to 2nd gear in order to slow down when near to traffic light ... is it harmful to the engine? Are there any difference in terms of petrol or diesel engine (applying "too much" engine brakes)? Thks....
Next time, apply ur brake first then change gear..... It is fairly okie to jump gear but dun do it at high speed orelse it might damage the gear box....
and it is fairly dangerous if u release the clutch padal too fast.... resulting in lose of control.... 
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which gear to select at wat speeds depends on ur gear ratio and rpm when u drop to a particular gear. engine braking is only effective from the region above 3k rpms so, u will have to adjust the gear u choose to drop to, to provide u with optimal engine braking effect. for normal driving, engine braking from 4k rpms downwards is acceptable. but if racing, i may use engine braking up to 8k rpms.
but using engine brakes at high rpms results in more stress not only to the gear box, but also to the engine as well so try to restrict its usage to low rpms for normal driving. at 80 km/h drop to 2nd gear abit hi if u ask me. the abrupt weight transfer to the front will cause the rear to lose traction and result in a spin out if u are going thru a corner.
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stopping traffic junction i would not suggest using engine brake. in my opinion the foot brake is meant for stopping and the engine brake is meant for regulating speed. you should always foot brake lightly while changing to a lower gear. when i was learning driving i was taught that to prevent the engine from reving too high during the gear shifting. would definitely stress less on your engine this way.
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when u are learning to drive to get your licence... u prob use alot of engine brake..... after that, u drive on the road, u hardly use engine brake because of the speed at which u drive.... to engine brake from 80kmh by engaging 2nd gear.... u will prob get a big jerk from your car..... kind of stress the drivetrain........ let you car roll and apply your car brake instead and adjust accordingly....
cheers -
relying on engine brake alone is dangerous, it must be used with the foot brakes. recently, my esi brake pad wearing out, so to conserve it a little longer, i used engine brake more than the foot brake, and i found my fuel consumption burning a hole in my pocket. now my brake pad change to new one liao. if use engine brake fron 4th to 2nd gear, it depends on the gear ratio of that particular car and the redline of the engine. if the redline is low, there is a high chance of the rpm getting into the redline thus damaging the engine, and vice versa. if the gear ratio is adjusted to have maximum top speed with minimum acceleration, there is also a high chance of the rpm getting into the red line, and vice versa.
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Try to learn Heel-Toe lor..it will help a lor in eating corners.... but still hv to from 4th to 3rd to 2nd gear..cos the revolution of 2nd gear is not the same as te rpm, u lik tat from 4th to 2nd will spoil gear teeth,mayb some time u also cannot enguage into 2nd gear from 4th gear cos there is a thing call syncro mash doing its job...if u wan better change to Redline transmission fulid better lah...b4 u start doing al tis things...
Cheers...