Go Back   EcoModder Forum > EcoModding > Motorcycles / Scooters
Register Now
 Register Now

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 12-12-2014, 09:19 AM   #11 (permalink)
Master EcoModder
Join Date: Jul 2011
Location: WI
Posts: 473
Thanks: 157
Thanked 77 Times in 55 Posts
Originally Posted by herberpower View Post
My father says I'm nuts . that to work better air must be as cold as possible . there is more power. other sport bikes have front air intakes for between cold and pressure.
As Frank noted - cold air = more power - if you tune for it by richening the mixture.

For efficiency, hot air atomizer fuel better and requires a leaner mixture - which usually improves mileage.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

Old 12-13-2014, 08:13 AM   #12 (permalink)
EcoModding Lurker
herberpower's Avatar
Join Date: Sep 2014
Location: Montmelo, state catalonia, of spain
Posts: 76

Dominates Everything - '88 Honda NX650 Dominator
90 day: 50.55 mpg (US)

Mini scooter - '15 Ride E1
90 day: 615.21 mpg (US)

Conor City 350 E-Bike - '03 Conor City 350
90 day: 907.26 mpg (US)

Maxi Scooter - '09 Vectrix VX1 NIckel Nickel
90 day: 233.45 mpg (US)

Vectra B - '01 Opel Vectra B Elegance
90 day: 27.77 mpg (US)
Thanks: 3
Thanked 12 Times in 8 Posts
I understand

cold air more power
Hot air better fuel economy .



  Reply With Quote
Old 12-13-2014, 08:36 AM   #13 (permalink)
Master EcoModder
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,020 Times in 1,303 Posts
On the original Nissan-Datsun 240Z, if you had every thing set in specs and the carbs perfectly adjusted, at about 50 degrees F, if you did not move the preheat flap to winter, the car was undriveable. Move the flap to winter and it became driveable almost instantly, within a few seconds. No other changes.

Variable venturi carburetors are especially prone to "icing" which is basically due to incomplete atomization of the fuel mixture.

Cold air being more dense will give more power with higher effective compression, but without fuel injection atomization and economy will both suffer. Even my 37 Ford with the original engine had a passage in the intake manifold where exhaust gasses heated the manifold right under the carburetor.

It's ancient efficiency technology.


  Reply With Quote
Reply  Post New Thread

Thread Tools

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com