Horse Power and its Effectiveness

[Mike Rolica]

Mike Rolica
Meridian Magnesium Products
Strathroy, Ont 
Ext. 260


	-----Original Message-----
	From:	bearbvd at cmn.net [SMTP:bearbvd at cmn.net]
	Sent:	Monday, December 13, 1999 10:56 PM
	To:	gmecm at efi332.eng.ohio-state.edu
	Subject:	Re: Horse Power and its Effectiveness

	>At 09:16 PM 12/13/1999 -0500, you wrote:
	>>A few comments:
	>>
	>>For a given displacement, long stroke means small bore means less
force.
	>>This exactly balances out the longer moment arm.  Long stroke
motors have a
	>>harder time at high revs (due to both inertia and limited
breathing) but
	>>they offer no advantage in low speed torque.
	>>
	>>Diesel engines make less torque than gas engines (naturally
aspirated).
	>>Their advantage is the BMEP is not limited by detonation so they
can take
	>>gobs of boost.
	>
	>Since when do they make less torque?

	Since forever. Because a diesel cycle at full throttle is not as
efficient
	as an Otto cycle at full throttle for equal compression ratios.

	>The cummins 5.4L I6 makes 650 lb/ft in full trim at 1800 RPM.
Tuned down
	>for Dodge, It makes 400 Lb/ft at 1800 RPM...  Would love to see a
gas I6
	>5.4L engine do that!

	Would love to see the Cummins 6BT do that without the "T"!! Gary DID
say
	"NA", I think!

	Guess why there are NO piston engined aircraft that use the diesel
cycle??  Because they do not rev high enough.  Don't make the high rpm
torque that an airplane neads...!  IT IS SIMPLE  1 GALLON OF DIESEL HAS
ABOUT 2/3RD MORE BTU'S THAN A GALLON OF GAS!  More energy before = more
energy converted to mech!  K.I.S.S.


	Greg