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Kinda like the blower motors they use for HVAC systems in industrial/commercial buildings.
You can buy one 1HP motor that runs at 1800RPMs and uses a certain size pulley set.
Or, you can buy a 1HP motor that runs at 3600RPMs and uses a different pulley set.
Both motors put out the same "work" but require different gearing to be used to achieve the same fan speed (as in, road speed for a truck).
Is one motor cheating, while the other is a "real" motor just because it uses different gearing (pully size) ??? Nope.
For grins, I just checked, and for 2009, the V10 and the 6.4L diesel are:
V10: 362HP @ 4750 Diesel 6.4L: 350 @ 3000
Of course, the torque curves are not the same, but the V10 certainly does it's best to get a decently flat torque curve.
So with the right gearing, and the right road speed, the V10 can surely put more power to the ground. Substantially more if it happens to be in a lower tranny gear because of it's extended RPM range. Whatever 12 HP means in the "real world"
Sorry, I meant part two. Too long in the sun today. We have an 09 SC SB SRW F-350 V10 TS with 4.10 gears. We're looking at buying an identical truck with a 6.4 and 3.73 gears. Then we'll start some real world comparisons.