It's getting heated in here....

 

i would be fine with that. running a diesel at red line is a lot different than running a gas engine at red line. running a diesel at 3k rpm on a 3400 red line is no different than running a gas engine 3k rpm on a 6k red line. they are both turning 3k rpm, whether its 50% or 90% of the powerband. the diesel also has stronger internals and better oiling capabilities. look at all the 80's and 90's model f-superduty trucks that are still running great with several hundred thousand miles on them. they came with up to a 5.14 rear end if i remember correctly. 65-70 mph and you were at the redline, but it would run there all day long.

 

While I can not find any definitive proof that diesel burns slower, you are mixing apples and oranges. The compression ratio is so much higher in a diesel that any comparison of timing advance is pointless, and what's worse is that you are talking about "ignition advance" when a diesel has no ignition except for it's compression. INJECTION advance is different than a gas motor, but again, one has nothing to do with the other. The diesel "knock" is because the the diesel HAS to ignite on the compression stroke, it doesn't just happen to knock because diesel burns faster.

Here's one place I did find a reasonable explanation of how diesel burns versus gasoline: http://www.custom-car.us/basics/diesel-engines.aspx

Diesel burns longer than gasoline, hence the lower RPMs at which diesel engines run.

Not saying one is better than the other in this post, just that there is a fundamental difference between burn rates, and the SLOWER rate of burn for diesel is what makes it excellent for low-end torque, and HUGE displacements.

 

sir, you do not have to think, its been noted all throughout this thread, check out the magazine article that was mentioned, where they tested multiple scenarios with the V10 and PSD. to say i don't think without some sort of logic or reasoning is just, well, a thought.

 

There are only a few people on this earth who can pull of sarcasm and make it look good. I gotta say, it's not very attractive on you.

Yes, this thread is PSD vs. V10, but you are making it 6.0 vs.V10. Please don't forget those of us who drive 7.3 liter trucks (also the largest sub-forum on this website), as one of the most reliable diesel engines ever made.

The truck in my sig? Yeah, its never been to a dealer...and only needed routine maintenance, and a starter, relay, a waterpump after 170,000 miles, and a few other odds and ends. No major failures. Still running original injectors. Nearly 200,000 miles.

Also, my original comments about diesels lasting 2x as long as a gas motor was based on general terms because a few pages back someone asked why diesels are preferred for heavy-duty use. I was simply adding my answer to that question when you started in on me. There was LOTS of conversation about different types of gas and diesel motors, not just V10s and PSDs, if you can remember back that far.

BTW, Kwikkordead is one of the most brilliant mechanics I have met to date.

 

if you hook 10k lbs to a v10 with 4.30's and a psd with 3.73's the v10 will beat it in any kind of drag race you want to run. flat land, up hills, etc. if im not mistaken i think thats the set up they tested in the article you quoted. its been a while since ive read it though. put 3.73's in the v10 so its more of an engine vs engine comparison and it will be a lot closer, but i still think the v10 will win. that being said, how many of us enter 1/4 mile drag races while we tow? they are two totally different engines designed with two totally different purposes. most diesel owners go with a diesel because it will pull the same load easier, at a lower rpm, get better fuel mileage and generally last longer. not because it will win in a drag race.

comparing the newest 3v v10 to the oldest 7.3 psd, the v10 is behind the 7.3 in hp and tq all the way from idle to 3k rpm. its not until you hit 3k rpm that the v10 starts to make more power. if a 3v v10 and my 97 psd hit a hill at 60 mph with 10k lbs hooked to them the v10 is still going to have to downshift first because at those rpms(~2k rpm) it has about 40 less lb/ft of tq than the old 7.3. there is a 100% chance it will beat me in a drag race up the hill, but i would rather climb the hill with ease and not have to downshift than to run it 4 and 5k rpm and blow everyone off the road.

 

I think you're the first V10'er to argue for 3.73 gears. It's a good argument for your driving style but don't discount the acceleration advantage you'd have with the 4.10. It isn't all about what you can do when you get the load moving.

 

Injection and Ignition timing are one in the same with diesels, the very moment the fuel enters the combustion chamber, it lights off. Modern diesels, and even old mechanical injection Diesels usually have some form of timing advance.

I'll say it again, the Diesel knock is because the Diesel detonates, expanding very fast and violently, gasoline engines also ignite the fuel charge on the compression stroke (usually around 10-14* BTDC at idle, and much more wide open), yet I don't hear them knocking all the time?

 

It makes it a pig from a stop, but I love them driving empty.
I love be able to down shift to second at higher speeds, but I hate not being able to run OD
and maintain speed up hill below 70 with a load.
I am needing to rebuild to back diff, but I can not decide between the 3.73s, 4.10s and the 4.30s. They all have a place they shine, and they all have a big down side.

 

Thank you Lisa.

 

Sounds like you have an internal conflict between the V10 and the psd. Have you thought about trading for an 05-ish V10? May make more sense than re-gearing.

 

Haha, tell I am done with college and have a job that pays better, I cant even afford to think about that. when the motor dies, I will pull it, rebuild it and put PI 310 HP heads on and some banks headers and Y pipe, maybe a 6 speed when the 4R100 dies.
But I am 5-10 years away from having the cash for a new truck. I will just keep working on mine tell it is what i want.

 

I will give you that the 7.3 is the best PSD in terms of overall reliability.

But that darn CPS sure didn't help it's reputation.

 

Leave it to Ford to throw a wrench in things eh?

The CPS is a $20 part that takes 10 minutes to change, 5 minutes if you really know what you're doing.

 

well, who cares if it gos out then. V10s have coil problems, so they come out even.