They really fall over at 3k don't they
I think they would be great engines in a Prado.
I’ve never had my 13BT close to 3000 rpm let alone 3400.The torque dropping off at 3k rpm would probably be the governor starting to reduce fueling. There's been at least one thread on the 15b Facebook group where it's been said they suffer valve float issues at 3400rpm and above. Which is why peak power is at lower revs than the 13bt. (On the 13bt peak power is 3400rpm, and that's when fueling starts to be pulled back)
I was going to say my 3B is the same.
I would have thought putting B series engine into a Prado would be too heavy?
My 3B - T once at 3K sounds and feels like I am screaming. it. I occasionally run it above 3K on spirited acceleration, or when downshifting. Redline is 4K, which I think you could only hit in neutral..You don’t use the revs in your 13bts and 3bs because you don’t feel the need, or because it feels like power is dropping off after the mid 2000s?
Just don’t drive that fast I guess. I checked yesterday, got up to 3000 on one shift but generallyWhy not? I shift every gear at 3000, have held it at 3000+ for hours at a time, occasionally gets held on the governor. They like to be worked, lugging doesnt help anything.
I remember @Dougal commenting on that in another thread. I think it is a combination of things, but partly the diesel can only burn so fast in a large cylinder with a long stroke. Also, direct injection engines generally don't rev as high as indirect injection. Add to that these motors have the small CT12b turbo which likely runs out of puff pretty quickly on such big displacement. Finally, these motors are designed for commercial and military truck application. Most diesel engines in those types of vehicles are similar high torque low revving motors.
I'm toying with the idea of putting one of these in an LJ78... Megacruiser motor/trans + Prado chassis/body = MegaPrado!
Yes it's the burn speed of diesel vs piston speed. Interestingly my Isuzu 4BD1T and VW 2.0 tdi hit peak power at roughly the same piston speed.
They would be a great engine in a Prado. Do it! I worked for a company that had two Dyna's, the bigger one was a 15B (not sure on the little). It was incredibly smooth and sweet for an engine that big. Much smoother and quieter than my Isuzu but it was almost 15 years newer and had a lot more sound deadening on the engine itself.