Gas vs PSD
Lead Driver
Joined: Nov 2007
Posts: 5,139
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A 1000HP F1 engine spinning at 18,000 RPM could be made streetable with the right gearing. It's simply too expensive to mass produce.
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
Good God yall here we go again. You can't have HP without tq. So no hp does not make tq. If that was the case you would have hp peaking before tq. You start with tq add movement rpm you start creating hp. Tqxrpm/5252=hp. No 1500 ftlbs at 1 rpm doesn't get you very but why does it have to stop there? Take a rusted bolt. It takes 1500 lbs to bust it loose you start turn faster loosing tq gaining rpms creating hp damn the got my nut off. Its the same way with the engine. Low rpm tq isn't a short coming neither is higher rpm tq an advantage. Its 2 different systems. You might like to turn those rpms taking off I like putting it in drive and at idel the truck starts creeping forward. I do not need higher rpms. I can travel just as fast as you can in the limits of my gearing. That's nothing to do w/ my engines rpm range. Yalls rpm range is only 1000 rpm higher. Its not like that's a big deal.
Lead Driver
Joined: Nov 2007
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I was down in Weaverville CA last weekend looking at an antique saw mill. It had a single cylinder 15HP @350RPM gas/diesel 64 inch (8" bore 8" stroke) motor running it. The thing was wild, you started it on gas and once it warmes up you switch it over to diesel. I wouldn't want to hazard a guess at the TQ output of that thing...I just know it would throw a 72" circular blade through a 36" pine log without breaking a sweat. It had a 50% overdrive so the blade was turning 700RPM.
the reason I bring this up is I have several 15 HP electric irrigation pumps at home. They have nowhere near the TQ of that 100+ year old gas/diesel contraption. In the race at the saw mill TQ gets the job done, just like everywhere else.
the reason I bring this up is I have several 15 HP electric irrigation pumps at home. They have nowhere near the TQ of that 100+ year old gas/diesel contraption. In the race at the saw mill TQ gets the job done, just like everywhere else.
Cargo Master
Joined: Mar 2006
Posts: 2,502
Likes: 2
From: Bend Oregon
TQ gets the job done. But the amount of work is dictated by the amount of HP being produced. You can have a 50 HP/1000fl/lb vehicle move a 10K# trailer across the street, but it can't pull at highway speeds. It doesn't make enough power. Then you can have a 300HP/300ft/lb engine that can pull the same load on the highway.
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
If thsts the case explain why the 6.2l makes 385 hp 400 ftlbs of tq and the 6.8l makes 360 hp and 480 ftlbs of tq. The reason you have that hp is because you had a certain amount of tq at a certain rpm. Not the other way around.
Postmaster
Joined: Apr 2006
Posts: 3,524
Likes: 2
From: CA Bay Area
Here is smaller version of this idea.
Sure looks like fun, but not very practical in real life.
Postmaster
Joined: Apr 2006
Posts: 3,524
Likes: 2
From: CA Bay Area
I didn't compare the diagrams, but from what you posted the second engine is having much flatter torque curve than the first one.
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Senior User
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2000 FORD F550 BUCKET TRUCK; C/W; TRITON V10 GAS; A/T; ALTEC SERVICE BODY; ALTEC A37G BUCKET; 37.5' | Proxibid®
That truck would probably have weighed somewhere around 13.5-14K empty, and 2-4K more with its everyday load. And it may have been pulling a trailer, too. Don't know if it was in any mountains, but notice the number in the last picture.
Current engine designs, manufacturing processes, and EFI make engines last a lot longer than they did 50 years ago.
Postmaster
Joined: Apr 2006
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From: CA Bay Area
Proverbial Longevity in 4.6 Million Kilometers
Lead Driver
Joined: Nov 2007
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What about this? Would you consider it a heavy load?
2000 FORD F550 BUCKET TRUCK; C/W; TRITON V10 GAS; A/T; ALTEC SERVICE BODY; ALTEC A37G BUCKET; 37.5' | Proxibid®
That truck would probably have weighed somewhere around 13.5-14K empty, and 2-4K more with its everyday load. And it may have been pulling a trailer, too. Don't know if it was in any mountains, but notice the number in the last picture.
Current engine designs, manufacturing processes, and EFI make engines last a lot longer than they did 50 years ago.
2000 FORD F550 BUCKET TRUCK; C/W; TRITON V10 GAS; A/T; ALTEC SERVICE BODY; ALTEC A37G BUCKET; 37.5' | Proxibid®
That truck would probably have weighed somewhere around 13.5-14K empty, and 2-4K more with its everyday load. And it may have been pulling a trailer, too. Don't know if it was in any mountains, but notice the number in the last picture.
Current engine designs, manufacturing processes, and EFI make engines last a lot longer than they did 50 years ago.
Engines last a lot longer than they did 20 years ago.
Senior User
Joined: Sep 2004
Posts: 116
Likes: 0
And? My point was that gas engines can and do last far longer than they did 50 years ago. Exactly how does a single car that has used three diesel engines swapped out 11 times counter anything I said? If each engine was rebuilt each time it was changed, that's an average of less than 260,000 miles each rebuild.
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
TQ gets the job done. But the amount of work is dictated by the amount of HP being produced. You can have a 50 HP/1000fl/lb vehicle move a 10K# trailer across the street, but it can't pull at highway speeds. It doesn't make enough power. Then you can have a 300HP/300ft/lb engine that can pull the same load on the highway.
Let's build this motor to beable to turn say 2300 rpms. Hp will peak somewhere between 1400 and 1600 netting our motor around 300 hp. I think we would all agree that would be enough rpm to to pull highway speeds in America.
Cargo Master
Joined: Jan 2005
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Hahaha Bill I flipped the script. And you just thought it was psd vs the v10. Bahahaha
Junior User
Joined: May 2011
Posts: 67
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From: Central Arkansas
War Story! I was in an RV park in '04 and was talking to another camper comparing our V10 SDs. I have a '04 250 and he had a '01 or '02 350. He used his to deliver 5ers and tagalongs all across the U.S. and Canada for a living. He had over 290k on the truck and it was still going strong. I asked about maintenance and breakdowns, his reply. "I just do the heavy service maintenance schedule and it has only let me down once. The alternator quit on a delivery from Midwest to the West coast and I was a day late" He may still be out there now, if so he has over 1 million on it by now. End War Story!