General engine tech -- Drag Racing to Circle Track
- Posts: 133
- Joined: Wed Aug 14, 2019 7:43 pm
Many years ago, engines were brought down slowly, after a run. What changed and why ?
- Posts: 15015
- Joined: Tue Nov 15, 2005 10:41 am
- Location: The Great White North
It just sounds so cruel; the poor engine straining its guts out as it's mercilessly dragged to its knees...
Felix, qui potuit rerum cognscere causas.
Happy is he who can discover the cause of things.
- Posts: 1466
- Joined: Thu Sep 29, 2011 8:55 am
Would be a good simulation of a hill.
- Posts: 313
- Joined: Sun Dec 13, 2015 10:21 am
- Location: Birch Run,Michigan
Or a pulling truck. About the only competition application, where deceleration pulls make sense.
- Posts: 1476
- Joined: Tue Sep 15, 2015 2:25 pm
The guy who I purchased some of the components to build my dyno, started the pull at max rpm and then loaded down to where he wanted to end it. Seemed weird to me, and after some reading, the inertia of the rotating assembly would give a slightly better HP and torque number. Lot of the old guys did it this way it seems.
- Posts: 6
- Joined: Wed Oct 06, 2021 11:00 am
- Location: Minnesota
Turbocharged diesel pulling tractor engines need to be tested by pulling down from the top in order to get the turbo spooled.