This certainly is complex stuff, and I am trying to recall what I learned in Power Lab many decades ago. I think you are correct that I got this garbled.
One of the things an intercooler does on a turbodiesel is to lower the temp (and pressure) of the intake charge to prevent early ignition. Greg -----Original Message----- From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com] On Behalf Of Mitch Haley Sent: Tuesday, October 02, 2012 10:53 AM To: Mercedes Discussion List Subject: Re: [MBZ] Oookkkkk Greg Fiorentino wrote: > Actually a properly set up intercooler on any turbodiesel greatly > increases the efficiency of the engine. The laws of thermodynamics > are such that the efficiency of an engine is proportional to the > difference in temperature of the intake and exhaust gases. You've said this before, and I never knew where you were coming from. > http://en.wikipedia.org/wiki/Thermal_efficiency#Engine_cycle_efficienc > y Thanks for the link. It appears that you are confusing combustion temperature, Th, with intake manifold temperature. At any rate, the efficiency, 1 - (Th/Tc), gets larger as Th gets larger. What you want is high combustion temp and low exhaust temp. Exhaust heat is waste energy out the tailpipe. Intake temp is not a factor in this calculation. IMO, heat entering the engine can only help to increase Th, and hence the efficiency of the engine, except that a denser intake charge might increase the effective compression ratio. Mitch. _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
