2006-08-17 20:14:35 · 11 answers · asked by skay_16 3 in Cars & Transportation ➔ Other - Cars & Transportation
1) If you have a Manual transmission, it is maintained in the same gear going up and coming down, your clutch isn't slipping, you maintain the same speed: your engine will turn the same RPM up and down the hill.
2) With the Manual transmission: The engine will work harder going up but the RPM will be the same, both ways.
3) If you have an Automatic transmission the result is different, the Automatic is coupled to the engine by a Torque converter that is full of fluid. The transmission is not designed to pump the Torque converter in reverse,( as in having the transmission turn the engine). So, there is slip built into the system when the vehicle is coasting or being pushed. Therefore, when you go downhill with an Automatic the vehicle can maintain the speed but the engine RPM's can drop.
4) Engine RPM is 'revolutions per minute' and have little correlation to the power being made.
5) As others have said if the transmission is shifting, of course the RPM's will be changing.
Yours: Grumpy
2006-08-17 22:10:15 · answer #1 · answered by Grumpy 6 · 4⤊ 0⤋
actually that depends on a few things, how fast your going how steep the hill is and if your maintaining speed or not. Logically going up a hill put more load on a car and possibily will require a better gear ratio or more horepower so if the car downshifts then obviously it will rev higher. Going down a hill doesn't require any power at all so it should rev lower.
2006-08-18 03:27:28 · answer #2 · answered by Swansen 2 · 0⤊ 0⤋
probably not. going uphill a loaded car would have to downshift to maintain the same speed, making an increase in RPM
2006-08-18 03:20:44 · answer #3 · answered by Shangri-La 4 · 1⤊ 0⤋
the rpm of the car will be the same, as long as U are in the same gear, of course going up the hill the weight of the car will try to slow U down, and going down hill the weight of the car will try to speed U up.
the only difference between going up a hill and down a hill is U use more fuel going up than U do coming down
2006-08-18 03:37:02 · answer #4 · answered by caprilover79 3 · 0⤊ 1⤋
if I set the cruise on my diesel truck 2250 rpms is 65 mph uphill or downhill but I am sure fuel use is much less downhill and much more uphill.
2006-08-18 03:21:00 · answer #5 · answered by Norman 7 · 0⤊ 2⤋
rpm means revolutions per minute..they signal the stress of the engine uphill the rpm will be high coz you are going up right so the stress on the engine will be high... down hill even if you switch off your vechile you keep going down right sooo it will be less in down hill..simply physics
2006-08-18 03:25:31 · answer #6 · answered by Anonymous · 0⤊ 3⤋
Case study...
How many revolutions will u get at the other end of a pencil while u twist 10 revolutions at the head?
10 = 10?
Correct!
We're talking about Velocity vs RPM (direct proportional).
2006-08-18 04:54:20 · answer #7 · answered by DalphinuS 1 · 0⤊ 4⤋
rpm's would be higher going up hill , the engine has to work harder to maintain a constant speed going up hill and pretty much coasts down hill unless you down shift then that would bring the rpm's up again.
2006-08-18 03:26:22 · answer #8 · answered by Anonymous · 0⤊ 3⤋
yes if you have a standard transmission. no if you have an automatic transmission
2006-08-21 17:57:23 · answer #9 · answered by waplambadoobatawhopbamboo 5 · 1⤊ 0⤋
Yes.
2006-08-18 03:20:46 · answer #10 · answered by Temple 5 · 1⤊ 3⤋