View Single Post
Old 03-12-2012, 03:07 PM   #4 (permalink)
Ecky
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: New Zealand
Posts: 5,077

ND Miata - '15 Mazda MX-5 Special Package
90 day: 39.72 mpg (US)
Thanks: 2,903
Thanked 2,560 Times in 1,586 Posts
Quote:
Originally Posted by WD40 View Post
IMHO it would be more effective to disable the appropriate injector and leave the valves alone, it seems to me that by shutting both intake and exhaust valves the piston would essentially be creating a vacuum causing even more issues.
Leaving the valves closed basically uses the air as a spring. The piston uses energy to compress it, but the air pushes the piston back down on the other side of the stroke. Leaving the valves open would waste the compression energy.
  Reply With Quote
The Following 3 Users Say Thank You to Ecky For This Useful Post:
Frank Lee (03-12-2012), jime57 (04-09-2012), mikeyjd (05-14-2014)