"Joe_Limon" (Joe_Limon)
03/28/2015 at 08:16 • Filed to: None
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"Joe_Limon" (Joe_Limon)
03/28/2015 at 08:16 • Filed to: None | 1
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Aside from physical testing, what is the best way to estimate fuel savings for the following situation?
If I am designing a work truck (380-400hp semi truck) and I can reduce transfercase load by 20hp under most operating conditions, what does this equate to in fuel savings (per hour?).
Manwich - now Keto-Friendly
> Joe_Limon
03/28/2015 at 14:15 |
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In my opinion, the best way is to measure your fuel economy is, before making changes, record your mileage and amount of fuel purchases over a few tanks.
Then after the changes are made, do the same and compare the difference.
Now about your truck... when you say "reduce transfer case load by 20HP", how exactly are you doing that? Is it by cutting your speed? Improving aerodynamics? Reducing weight? Changing gearing? And at what RPM is the torque peak for the engine in your truck (torque peak is usually most efficient point in the rev range)?
And I don't think anybody can give you the fuel savings per hour without knowing other relevant info... like the average speed over that hour, your current fuel economy, the weight your carrying, etc.
It's like discussing fuel savings by turning off AC and opening a window instead. At low speeds, turning the AC off will save some fuel. But if you're going 200km/h, the wind drag caused by the open window will be worse than having the AC on. And in the case of a truck... are we talking about a cheaper/older brick-shaped truck with no aero mods or one of newer trucks with a bunch of Aero mods?
All those considerations need to be factored in before any kind of estimate can be made.
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Joe_Limon
> Manwich - now Keto-Friendly
03/28/2015 at 15:39 |
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I would be reducing engine load by optimizing the equipment attached to it. The economy savings are when the truck is working and not when it is running down the highway.
I read for large marine diesel engines a rule of thumb is you will burn about 1 gallon/hour for every 18-20hp.
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Manwich - now Keto-Friendly
> Joe_Limon
03/28/2015 at 15:43 |
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Well from that basis then, I'd say you could be looking at a 5% reduction in the fuel consumed.
opensecretdoors
> Joe_Limon
09/01/2015 at 06:45 |
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are you still designing what components into what body engine tranny diff wheel tire size, from nc, a semi here a class 8 truck, what you call semi
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Joe_Limon
> opensecretdoors
09/01/2015 at 21:59 |
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Yep, sure am. Economy died here in Alberta, so I am the last designer left of 8 we had last summer.