Re: no coolant 'lhm' as on Cadillac northstar and au falcon
Posted: Mon Sep 15, 2014 9:08 pm
The thermal efficiency of the engine is somewhat load sensitive, so switching off some cyls while running others should reduce the *total* heat rejection to the non-existent cooling system. The point is though, the half of the cyls that are at any given moment working twice as hard will be dumping something less than twice as much heat. The air going through the non-firing cyls should help a lot too.
My old HJ needed about 15hp at the wheels to push it at 100kph. There is this stretch of very steady hill on the freeway near my place where the car would maintain 100kph rolling out of gear. It has a fall of 75m down to 38m over a distance of 1800m - works out to almost exactly a 1 in 50 slope so it probably is that. Plug the weight of the car into a bit of trigonometry to get the tractive effort, figure in speed and there you go.
My old HJ needed about 15hp at the wheels to push it at 100kph. There is this stretch of very steady hill on the freeway near my place where the car would maintain 100kph rolling out of gear. It has a fall of 75m down to 38m over a distance of 1800m - works out to almost exactly a 1 in 50 slope so it probably is that. Plug the weight of the car into a bit of trigonometry to get the tractive effort, figure in speed and there you go.