Im always open to suggestion and the way your putting it does make it sound feasible, im going by exactly what ive seen in my own personal cars, unless they had slipping transmissions, screwed tacho's or different diff gears im still sticking with my theory...
Unfortunately your theory appears based only on some assumptions rather than logic. If the pushbike example makes sense to you, as it should, then you should accept anything to the contrary as absurd.
If we put a v8 in the pushbike and it did 400rpm would it go any faster than if we put the v6 in the pushbike and maintained its speed to 400rpm.....of course not.
If the v6 and v8 t5 manuals revved at exactly 1800rpm like dan said and share a differant final drive ratio how can the crank possibly be spinning at the same speed? ..
Difficult to make much sense of this?
but if two engines are revving at 1800rpm then the crankshaft is rotating at that same speed in both engines. (there is no other way of putting it or interpreting it, rpm in engines is defined as revolutions of the crankshaft per minute)
So far no one else has lept to your defence in this aspect.....
Look, clearly you have a misconception going on here.......you really need to think it through some more.
Perhaps even get to the bottom of why your v8 and v6 show differnt rpm for the same road speed when you believe they have identical gearing.
What have you done to test that the gearing is the same? have you verified the diff ratios( I dont mean what is stamped on the build plate) do you know how to test the diff ratio? have you tested the drive shaft speed in overdrive?......and compared it to the crankshaft rpm?
Try this link
Practical Problems In Mathematics ... - Google Book Search youll notice the questions dont need to say what size the motor is.
Anyway, it has got away from the point, a v8(
an engine of larger capacity) will still use more fuel than a 6(
smaller capacity) even on the highway cycle.....
even if the gearing is made taller for the v8 so it can maintain a lower rpm than a v6.. Notice how Ive stressed the capacity, that's what its about.....not how many cylinders it has.
Which I have given you links to before, but Ill summarise again as you seem to have not taken it in:
its just not about the swept volume, its also about the throttle opening.
For a v8 to maintain 100km/h ~15kW of engine power is needed, and indeed it would be the same for the v6. Similar amounts of fuel are needed so similar amounts of air need to be drawn into the motor to react the fuel properly. With the same amount of air going it follows that the density of air in the larger motor will be less than the smaller motor. It also follows that on the compression stroke, the compression pressure in the bigger motor(dynamic compression) will be smaller since the cylinders are only partially filled .......efficiency is reduced.....result....larger motor needs slightly more fuel and air at light loads.
So yes,the v8 needs smaller throttle openings to provide the same load, which is commonly referred to by the novice as not working as hard. In fact it is working harder to achieve the same power output as it is burning more fuel
Ill leave it there, if some v8 owners want to believe something else, all I can say is ive given it my best shot.
