View Single Post
Old 05-16-2013, 02:06 AM   #39 (permalink)
jakobnev
Eco-ventor
 
jakobnev's Avatar
 
Join Date: Oct 2010
Location: sweden
Posts: 1,630

Princess - '92 Mazda MX-3 GS
House of Tudor
Team Mazda
90 day: 53.54 mpg (US)

Shirubāarō (*´ω`*) - '05 Toyota Prius Executive
Team Toyota
90 day: 54.88 mpg (US)

Blue Thunder - '20 Hyundai IONIQ Trend PHEV
Team Hyundai
Plug-in Hybrids
90 day: 587.16 mpg (US)
Thanks: 74
Thanked 701 Times in 444 Posts
Send a message via MSN to jakobnev
Quote:
I was thinking that plugging the intakes off would basically negate any need to do the exhausts... since nothing would be flowing through anyway.
The intake, compression and power strokes will happen with a vacuum, but towards the end of the power stroke, when the exhaust valve opens, gas would rush into the empty cylinder. The last upstroke, would then be done with pressure acting on the piston.

Cancelling one up and one down stroke with vacuum, leaves us with one down stroke with vacuum and one up stroke with pressure, netting a significant loss.
__________________




2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
  Reply With Quote