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Old 04-04-2021, 12:33 PM   #61
Byron B
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According to Banks Power:

In a diesel engine, stroke length (2 or 4) and cylinder pressure are the main factors that increase torque. ... Their lean air-to-fuel ratio also helps diesel fuel go longer and add extra torque. Diesel fuel also has more energy per gallon than gasoline, which makes diesel fuel more efficient for combustion and torque.
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Old 04-04-2021, 06:26 PM   #62
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Originally Posted by JABURKHOLDER View Post
Why the shouting ?

Anyway...
Torque in an internal combustion engine is produced through several factors...

Compression ratio
Calorific value (energy of the fuel)
Stroke length
Combustion speed
Turbo boost pressure

All of these are higher in a diesel, thus the greater torque value.

You can get the same torque out of a gasoline engine per liter as the diesels make. My little 2.7 puts out 148 pound feet per liter. Fords 6.7 puts out 156 T per litter Chevyís 6.6 itís 146 and the standard 6.7 Cummings itís 131 their high output diesel puts out 160 per liter. So you can get the same power out of a gasoline engine if the engine is designed strong enough and you have enough boost. The boost in my Ecoboost goes up to 20 PSI.
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Old 04-04-2021, 09:49 PM   #63
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So you can get the same power out of a gasoline engine if the engine is designed strong enough and you have enough boost.
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The key word...ĒifĒ
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Old 04-05-2021, 09:38 AM   #64
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Think you can get the same HP, but you'll be lacking in the Torque department.
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Old 04-05-2021, 11:15 AM   #65
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My little 2.7 has more torque per liter than either the Chevy or the Cummings standard diesel per liter. The reason it does is because it’s a compacted graphite iron engine where the Chevy and the standard Cummings are cast iron block engines. CGI is much stronger than cast iron and will withstand much higher pressure. The 2.7 does have higher HP per liter because it like gasoline engines can turn more RPMs but that HP is what we are talking about.
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Old 04-05-2021, 11:46 AM   #66
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My little 2.7 has more torque per liter than either the Chevy or the Cummings standard diesel per liter. The reason it does is because itís a compacted graphite iron engine where the Chevy and the standard Cummings are cast iron block engines. CGI is much stronger than cast iron and will withstand much higher pressure. The 2.7 does have higher HP per liter because it like gasoline engines can turn more RPMs but that HP is what we are talking about.
Lynwood
Again some misinformation; Cummins uses CGI blocks for the past 3 years.
And torque per liter is not the key measurement here - total torque and the torque curve is.
There is a reason the eco boost is not in the Ford heavy duty trucks; actually lots of reasons. Maybe someday Ford will figure out how to make an Eco boost work in their heavy duty trucks - but it's pretty telling that they've been making eco boost engines for over a decade and still don't. And the direction they are going means it will be far more likely to see an electric engine than eco boost.

Not sure why you keep beating the drum about an engine that doesn't even belong on a Montana forum discussion.


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Old 04-05-2021, 12:40 PM   #67
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Again some misinformation; Cummins uses CGI blocks for the past 3 years.
And torque per liter is not the key measurement here - total torque and the torque curve is.
There is a reason the eco boost is not in the Ford heavy duty trucks; actually lots of reasons. Maybe someday Ford will figure out how to make an Eco boost work in their heavy duty trucks - but it's pretty telling that they've been making eco boost engines for over a decade and still don't. And the direction they are going means it will be far more likely to see an electric engine than eco boost.

Not sure why you keep beating the drum about an engine that doesn't even belong on a Montana forum discussion.


Brad



I will agree. the turbo gassers will never make the same mileage as the diesels anyway and the overall cost will be a lot more in the long run in fuel and maintenance so this discussion is pretty much moot.
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Old 04-06-2021, 09:52 AM   #68
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Torque and horsepower ate the same at 5225 rpms..
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Old 04-06-2021, 10:06 AM   #69
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Torque and horsepower ate the same at 5225 rpms..
Exactly and that goes for any ICE. I couldnít remember if it was 5225 or 5252 RPM.
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Old 04-06-2021, 04:33 PM   #70
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Exactly and that goes for any ICE. I couldnít remember if it was 5225 or 5252 RPM.
Lynwood
haha, I had to go look it up also and it is 5252 rpm - mechanic school for me was a looong time ago

But I'm not sure I understand how that matters to the conversation around HP vs Torque? So they are the same at that particular rpm, now what?

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