88 Ford
Full Access Member
I don't have a lot of desiel experience, but if what you want is increased HP.....is there a way to move the torque curve further out in the rpm band. Since HP is simply a mathmatical calculation of TQ at a certian RPM you could move the torue curve up in the RPM band to get more HP. On gasser engines this is done with a high flow intake/exhaust/cams. Then find a turbo that can push enough cfm at the high rpms. If you had everything balanced, what is the safe RPM'd of these engines?
In short, to make more HP you don't always have to increase the torque.....you can just shift it to a higher RPM. This is how I can get 300hp out of my 3.2L gas engine that makes 260 ft/lbs.
The real question with any build is defining what you are going to use the engine for. Do you need TQ? Do you want HP? What RPM wil the engine be run at?
Lot's of good discussion in this thread. Thanks
Well there are a few ways to move the curve. There is a cam called the J2 can available which is more of a horsepower cam. It also drops compression a lil bit as well so you can run more boost with it. Also the size of turbo has quite an affect as well. Obviously a bigger turbo will spool later which lowers your torque but at the same time, your horsepower is increased due to the turbo having a more efficient compressor.
As for increased rpm, you can use a 4k governor spring from a Chevy diesel but IMO opinion it isn't really worth doing unless your pump is modded accordingly. With most IPs, the fuel drops higher in the rpm. There are ways to prevent that though when it is modified. As far as what needs up be done so that the engine can handle it, I'm not write sure. But like you said balancing is always good and you can always lighten the rotating mass too. And stiffer valve springs like the Comp 910s are a necessity to prevent valve float...