Horse Power and its Effectiveness

[Greg Hermann]

>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??

Greg