Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - An engine cycle where intake valves only open in the last part of intake cycle?

Occasionally6 · 07-20-2013, 09:32 PM

Considering just the idealised cycle on a PV diagram there will be unrecoverable pumping work done during the part of the "intake" stroke where the valve remains closed.

This is different to early or late inlet valve closing where the pressure remains trapped in the cylinder and the work done in generating it can be recovered.

07-20-2013, 09:32 PM	#5 (permalink)
Occasionally6 Master EcoModder Join Date: Apr 2013 Location: World Posts: 385 Thanks: 82 Thanked 82 Times in 67 Posts	Considering just the idealised cycle on a PV diagram there will be unrecoverable pumping work done during the part of the "intake" stroke where the valve remains closed. This is different to early or late inlet valve closing where the pressure remains trapped in the cylinder and the work done in generating it can be recovered. Last edited by Occasionally6; 07-22-2013 at 01:50 AM.. Reason: Brain ahead of fingers