Oh! Oh! I get it now! Your posts can't be deleted any longer and you're already regretting most of it. That is funny!!!

Don't worry, we've all been there at some point.

 

I don't know enough about the diesel cycle and engine design to say. Maybe somebody else can comment on what kind of bad/good things happen at such high compression and engine speeds.

 

Doesn't quite work that way. Diesels require lots more compression than gas motors, due to the whole compression ignition thing. Meaning that they usually are going to have a longer stroke than your average gasoline motor. Combine that with the fact that diesel fuel does NOT burn as quickly as gasoline make a high revving diesel engine very difficult, if not impossible to do.

Don't believe me? Look at smaller diesel engines used in the light duty market you see elsewhere, even turbocharged ones. The toyota D4-D engine used in the Hilux pickup everywhere BUT the USA is a 2.5 liter 4-cylinder turbodiesel. With peak HP at a lowly 3600 RPMs.

The Volkswagen 2.0L TDI engine, used in many domestic models has a peak HP of 4,000 RPMs, while it's 2.5L gasoline counterpart produces 30 HP more at a relatively blistering 5,700 RPMs.

It is difficult and expensive to increase torque without an increase in displacement or forced induction. Horsepower, however, can be changed by manipulating the torque curve. For example, if you adjust the cam and spark timing to produce peak torque higher in the RPM range, you will make more horsepower. This is NOT something that is feasible with diesel engines for the simple reason that the fuel just doesn't burn fast enough to make power at high RPMs. Gas motors can.

I know what you mean about motorcycles, my '05 Z750S produces over 100 HP at 10,000 RPMs...you can't get a long-stroke V10 to turn that fast without breaking, and a diesel engine simply won't do it.

The only way to increase power in a diesel, as RPM increases are impractical, is to increase torque. The best way to increase torque is to add forced induction. This works very well because diesels are MUCH easier to add the F/I treatment than a gas motor, as there is no risk of detonation, as the fuel never sees the cylinder until it's time to be burnt.

You think designing a high RPM motor to last 200K miles is expensive? What do you call a dual-turbo setup? Cheap?

Which is why we see nearly every single modern highway diesel engine comes factory equipped with a turbo. Diesels need 'em. Gas motors don't.

On edit:

Here are my sources for comparisons:

 

Are you high?

 

I didn't actually know if it was possible to do it was just a thought. I just wonder what it would take to do it. I don't think making a high rpm engine last 200K would be expensive. I think that making a high rpm diesel engine last 200K would be expensive (if it was even possible). Wonder what kind of power a gasser would make based around a PSD setup. I need to stop drinking and posting. Gives me bad ideas.

 

Would be nice, but as far as I can tell, it's not possible. Diesels aren't limited in the amount of boost they can use like gas motors are. The new EcoBoost V6 uses some pretty cutting edge technology, and that thing can only built 12 PSI of boost. Not too sure what limits boost with modern direct injection gassers, but a diesel can burn any amount of boost you can throw at it, assuming of course fuel delivery and engine durability can handle it.

Traditional gas motors can't build much boost because of detonation, making a high boost, low RPM gas motor impossible with common fuel injection technology. Not so sure with direct injection, though...

 

You said you posted for laughs, didn't you? I finally found something about you to laugh about. Don't stop now because you are a laugh factory.

 

I think it has something to do with near instantaneous uncontrolled combustion when the fuel is injected. GM has been experimenting with gasoline auto-ignition for better fuel efficiency. It seems they are limited to only certain operating conditions. Maybe there is some real potential there to combine the best characteristics of both engines?

 

Actually there are a lot of high speed diesel engines around...most large aircraft have anywhere from one to eight of them installed.....although they don't really operate on the "diesel" ignition by compression concept, they do burn a diesel fuel.


“A federal government big enough to give you everything you want, is strong enough to take everything you have.” ~ Thomas Jefferson

 

What large aircraft has only one? I would say that large aircraft have anywhere from three to nine. The Buff has an APU doesn't it?

 

We are now up to 506 posts !!!!!!!!!!!!!!!!!!!!! and still no takers.....

ALL these hypotheticals !!!!!!!!!!!!!!!!!!!!!!


IF you do this, or IF you do that, or blah, blah, blah ......
this is starting to sound like an diatribe about Obama Care !

the thread title was "V10 vs psd"....

let's make it simple for all to follow


I have the latter and have responded at least 5 times with....

Let's do whatever "test" you want - whenever you want - ANYTIME you want....

I have timeslips - I have a trailer - I have too much to do, but will make the time !!!!

CLUCK, CLUCK, CLUCK - I say again !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

Since you will make the time, please meet me in Medford Oregon and we'll get it taken care of. Since you have a trailer, please bring it and we'll make it more interesting with adding the tallest summit on Interstate 5, with your trailer attached. Don't tell me you're going to "cluck, cluck, cluck" and not drive out to Oregon for the spanking my V10 truck deserves.

 

Good one...
Meet ya half way


More talk

 

That's what I thought...

 

jdadamsjr, I'd take you on. Ever come East for anything?

I won't race you. I will hook you up to my 5th wheel cargo trailer, we'll go for a spin. Then I'll hook up, we'll go for a spin and compare.

I doubt there would be a whole lot of difference in acceleration but we could compare the behavior and the perception of a struggling motor. It would push your truck to the limit too.