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August 7th, 2014 02:31 PM #1Mga experts ask ko lang kung anong mas magandang configuration ng diesel engine let say parehong 2.5 Liter diesel engine
1.ano kaya mas malakas sa akyatan,mas mabilis sa acceleration at mas mabilis sa rektahan
2.ano mas matipid
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August 7th, 2014 03:28 PM #2Also consider the differential gear or final drive ratio. With high differential ratio 4.1 and
higher, malakas sa akyatan at mabilis sa acceleration. Below 4.1 mabilis sa recta
matipid sa gas kasi mas mababa RPM at the same speed.
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August 7th, 2014 03:31 PM #3
Stroke ratio - Wikipedia, the free encyclopedia
TS: For your better understanding.
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August 7th, 2014 03:37 PM #4
assuming all factors the same:
altitude
air temperature
load
speed
fuel quality
ambient atmospheric pressure
designed compression ratio
the difference in fuel economy would not be noticeable. however, the torque for the longer stroke (longer crank throw or over square engine) would be higher since it will have more leverage.
but the engine with shorter crank throw (under square engine) can compensate this with a higher redline or rpm range. what matters now will be the volumetric efficiency specially the intake valve opening time is shortened by the increased speed
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August 7th, 2014 03:42 PM #5
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August 7th, 2014 03:45 PM #6
pag sinabi mong short stroke engine then i take it that piston stroke length < cylinder bore diameter. so, meron bang "short stroke" diesel engine? by requirements of the ignition system (compression ignition so it has to have a high compression ratio) e medyo mahirap yata gawin yan. true na mas mababa na ang compression ratios of new diesel engines now but that is a development due to crdi. because of the higher injection pressures the atomization of fuel is better leading to easier ignition.
but, theoretically, in case in the future they develop a diesel engine fuel than ignites at lower compression ratios...
small bore, long stroke = high compression ratio, high torque (kasi mas malaki ang moment arm. moment arm = 1/2 of the stroke).
large bore, short stroke = lower compression ratio, lower torque (as above, smaller moment arm).
this is why diesels have inherently higher torque output than gasoline engines because the piston stroke > cylinder bore. and this is also why the favorite "btek yo!" of our fav fanbois have the lowest torque of all, because they have engines where bore > stroke. the engine design sacrifices torque for the ability of the engine to rev up faster.
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August 7th, 2014 03:51 PM #7Gud aftie sir, for example both engine are 2.5 liter pero ung isa is Bore: 91 x Stroke: 96, then the other one Bore:92 X Stroke:93 meron ba talagang effect yan sa acceleration and rekta and kung meron which one has the advantage assuming nga sir na the rest is equal na
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August 7th, 2014 03:53 PM #8
A general rule, (but very subjective)
Long stroke, small bore engines (undersquare) = high torque
Short stroke, big bore engines (oversquare) = high horsepower
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August 7th, 2014 03:53 PM #9
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August 7th, 2014 03:55 PM #10
that may be, but we all got plastic, young and old. we asked the lto guy, "papel ba po, o...
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