Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 10-27-2020, 07:51 PM   #171 (permalink)
EcoModding Apprentice
 
Join Date: Jun 2012
Location: Florida
Posts: 222
Thanks: 0
Thanked 22 Times in 18 Posts
My response to single seater 100MPG at 60MPH:

I used to mod my Honda Rebel 250. It could get 110-120MPG at 45-60MPH.
That being said, forget about getting 100MPG out of any gasoline vehicle that's heavier than 500LBS.

I believe the optimal engine is a 300CC engine, single or ptwin engine, geared in such a way that it would reach 2k RPM at 60MPH in final gear.


Take reference car 2550LBS 'Fiesta ST' with 1 liter triple cylinder turbo enigne, and ~45MPG real life avg MPG.
Or, the Mitsubishi mirage with their 1 liter NA engine 2000LBS, 50 real life avg MPG car.

Then look at the highest MPG motorcycle (a 125cc Honda PCX) netting 115MPG. The next best one would be a modified Honda Rebel 250CC, which could net 105MPG.

If you plan on making a dual wheel vehicle with a 300cc engine and an aerodynamic shell, you could actually still get 100MPG, but that's about it.
For a 3 or 4 wheeled vehicle, you'll probably be limited to 75-85MPG at best, unless you run it on a track, and can do with an acceleration of 0.1 to 0.05G or so.

Even a modified Honda CBR300R for MPG, could only net 85MPG at best.
(and that was with modified ECU, and max gearing change possible, hitting 3k RPM at 60MPH). In theory it could hit 90-95MPG if it ran at 2,5k RPM.
This engine lugs at 2k RPM.

Edit: Like mentioned in the beginning of this thread, a diesel might get the MPG you'd want, and if you're ok with no acceleration, you could even hit 120MPG. The Kubota engines are probably going to be able to get the job done, however they're not a very pleasant engine for that purpose.
They are pretty low power, and don't have much reserve (meaning, you'll run a pretty low acceleration down low, all the way to up top of the rev range.


Last edited by ProDigit; 10-27-2020 at 08:26 PM..
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 10-27-2020, 08:34 PM   #172 (permalink)
Master EcoModder
 
redneck's Avatar
 
Join Date: Jun 2009
Location: SC Lowcountry
Posts: 1,795

Geo XL1 - '94 Geo Metro
Team Metro
Boat tails and more mods
90 day: 72.22 mpg (US)

Big, Bad & Flat - '01 Dodge Ram 3500 SLT
Team Cummins
90 day: 21.13 mpg (US)
Thanks: 226
Thanked 1,353 Times in 711 Posts
Quote:
Originally Posted by ProDigit View Post
My response to single seater 100MPG at 60MPH:

I used to mod my Honda Rebel 250. It could get 110-120MPG at 45-60MPH.
That being said, forget about getting 100MPG out of any gasoline vehicle that's heavier than 500LBS.

I believe the optimal engine is a 300CC engine, single or ptwin engine, geared in such a way that it would reach 2k RPM at 60MPH in final gear.


Take reference car 2550LBS 'Fiesta ST' with 1 liter triple cylinder turbo enigne, and ~45MPG real life avg MPG.
Or, the Mitsubishi mirage with their 1 liter NA engine 2000LBS, 50 real life avg MPG car.


https://ecomodder.com/forum/showthre...xed-23497.html

850cc

Top speed 80+ mph

250.6 mpg at the Green Grand Prix in 2015.




>

.
__________________


Woke means you're a loser....everything woke turns to ****.

Donald J Trump 8/21/21




Disclaimer...

I’m not a climatologist, aerodynamicist, virologist, physicist, astrodynamicist or marine biologist..

But...

I play one on the internet.

  Reply With Quote
Old 10-27-2020, 08:46 PM   #173 (permalink)
Master EcoModder
 
Join Date: Jun 2011
Location: Earth
Posts: 591
Thanks: 27
Thanked 145 Times in 113 Posts
Quote:
Originally Posted by redneck View Post
https://ecomodder.com/forum/showthre...xed-23497.html

850cc

Top speed 80+ mph

250.6 mpg at the Green Grand Prix in 2015.




>

.
I was reading a webpage that criticized the Locost MAX for having a tractor engine that likely put out a lot of emissions. If that's true, it defeats one of my purposes.
  Reply With Quote
Old 10-27-2020, 11:37 PM   #174 (permalink)
EcoModding Apprentice
 
Join Date: Jun 2012
Location: Florida
Posts: 222
Thanks: 0
Thanked 22 Times in 18 Posts
Quote:
Originally Posted by redneck View Post
https://ecomodder.com/forum/showthre...xed-23497.html

850cc

Top speed 80+ mph

250.6 mpg at the Green Grand Prix in 2015.




>

.
I know shell made some crazy high MPG vehicle with spoke wheels, but that thing needed a fuel heater, and had zero to sixty acceleration probably longer than it took to read this whole thread!
  Reply With Quote
Old 10-28-2020, 03:23 AM   #175 (permalink)
Master EcoModder
 
redneck's Avatar
 
Join Date: Jun 2009
Location: SC Lowcountry
Posts: 1,795

Geo XL1 - '94 Geo Metro
Team Metro
Boat tails and more mods
90 day: 72.22 mpg (US)

Big, Bad & Flat - '01 Dodge Ram 3500 SLT
Team Cummins
90 day: 21.13 mpg (US)
Thanks: 226
Thanked 1,353 Times in 711 Posts
Quote:
Originally Posted by sgtlethargic View Post
I was reading a webpage that criticized the Locost MAX for having a tractor engine that likely put out a lot of emissions. If that's true, it defeats one of my purposes.
Fractional amount of fuel used = fractional amount of emissions created

Nothing is emission free.



>

.
__________________


Woke means you're a loser....everything woke turns to ****.

Donald J Trump 8/21/21




Disclaimer...

I’m not a climatologist, aerodynamicist, virologist, physicist, astrodynamicist or marine biologist..

But...

I play one on the internet.

  Reply With Quote
Old 10-28-2020, 03:41 AM   #176 (permalink)
Master EcoModder
 
redneck's Avatar
 
Join Date: Jun 2009
Location: SC Lowcountry
Posts: 1,795

Geo XL1 - '94 Geo Metro
Team Metro
Boat tails and more mods
90 day: 72.22 mpg (US)

Big, Bad & Flat - '01 Dodge Ram 3500 SLT
Team Cummins
90 day: 21.13 mpg (US)
Thanks: 226
Thanked 1,353 Times in 711 Posts
Quote:
Originally Posted by ProDigit View Post
I know shell made some crazy high MPG vehicle with spoke wheels, but that thing needed a fuel heater, and had zero to sixty acceleration probably longer than it took to read this whole thread!
No spoke wheels. No fuel heaters or special gadgets.

Just a well thought out package.

The car accelerates normally and does not impede traffic.


>

.
__________________


Woke means you're a loser....everything woke turns to ****.

Donald J Trump 8/21/21




Disclaimer...

I’m not a climatologist, aerodynamicist, virologist, physicist, astrodynamicist or marine biologist..

But...

I play one on the internet.

  Reply With Quote
Old 10-28-2020, 11:30 AM   #177 (permalink)
Master EcoModder
 
Join Date: Jun 2011
Location: Earth
Posts: 591
Thanks: 27
Thanked 145 Times in 113 Posts
Quote:
Originally Posted by redneck View Post
Fractional amount of fuel used = fractional amount of emissions created
That's true, but too simplistic. Rates and what the particular emissions are, are important.

Quote:
Nothing is emission free.
I've been wondering if it's possible to have a combustible fuel and/or system that cleans the air.
  Reply With Quote
Old 10-28-2020, 01:02 PM   #178 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 15,861
Thanks: 23,922
Thanked 7,207 Times in 4,640 Posts
100-mpg

I did some back-of-the-envelope calculations with the 2018, University of Michigan, NOVUM, solar racer, Cd 0.10, Af approx. 7.788-sq-ft, curb weight 420-pounds, Length- 196.0-inches, width- 38-inches, and height- 35-inches. 4.8-hp. top speed- 85-mph.
--------------------------------------------------------------------------------------
I 'inflated' the car, growing to the height of a common, contemporary sedan, height= 55.5-inches, width= 60.25-inches, and length= 310-inches ( wow!)
Using a rough cubic displacement relationship, the weight would come in around 1625-pounds, with 19.145-hp, a 19.943-kWh lithium-ion pack, and 90mm Schwalbe 'Cruiser' tires.
I allowed an inflatable, 45.8-inch tail, to allow for garage parking. Top speed would be held to 85-mph. Allowance for 2.775-inch ground clearance ( air suspension ).
It would be 2-place. 1,975- pounds with two aboard.
Cd 0.10, Af 19.583-sq-ft, CdA 1.9583 sq-ft.
At 65-mph, the road load is 7.887=horsepower, 90.519 W/mile. 3.389-hours drive time to battery exhaustion, 220-mile range, at 371.76 mpg-e.
-------------------------------------------------------------------------------------
A crude metric for ICE would be, figure 1/3rd the efficiency of a BEV, so with a gasoline powerplant, you might expect to see 124-mpg @ 65-mph constant velocity, with two side mirrors.
------------------------------------------------------------------------------------
For comparison, Dr.Paul MacCready of AeroVironment, estimated the 1987 GM Sunraycer at 400-mpg, if powered by an ICE powertrain.
------------------------------------------------------------------------------------
A streamlined, 2018 LEAF SV would be looking at 198 mpg-e HWY, and 235-miles range, vs 148-miles and 125-mpg-e.
-----------------------------------------------------------------------------------
100-mpg is there for the doing. You just really got to want it. With BEV's it's no challenge at all.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 10-28-2020, 01:07 PM   #179 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 27,562
Thanks: 7,738
Thanked 8,554 Times in 7,041 Posts
Quote:
Originally Posted by sgtlethargic
I've been wondering if it's possible to have a combustible fuel and/or system that cleans the air.
Any engine will do so if the air is dirty enough?
__________________
.
.
Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster

____________________
  Reply With Quote
Old 10-28-2020, 01:26 PM   #180 (permalink)
Master EcoModder
 
Join Date: Jun 2011
Location: Earth
Posts: 591
Thanks: 27
Thanked 145 Times in 113 Posts
Quote:
Originally Posted by freebeard View Post
Any engine will do so if the air is dirty enough?
On one hand I want to reply here and now; on the other I don't want to split this thread with this topic any further.

  Reply With Quote
The Following User Says Thank You to sgtlethargic For This Useful Post:
freebeard (10-28-2020)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com