Can a motor run backwards
03-19-2009, 06:32 PM
#1
Senior Member
Thread Starter
Can a motor run backwards
Hey i was just thinking about this I know it couldn't happen now because of the starter... but you know the old cars that you had to crank by hand... could you crank one backward and it run or are there things that wont go backward... Just a random thing that popped into my head...
03-19-2009, 08:09 PM
#3
Member
Join Date: Feb 2009
Location: AB, CA eh!
Posts: 93
Likes: 0
Received 0 Likes
on
0 Posts
03-19-2009, 08:49 PM
#5
Senior Member
EDIT:
Looked into it more, and the 4 strokes won't run backwards.
Last edited by Ty; 03-19-2009 at 09:49 PM.
03-20-2009, 01:19 AM
#6
2004 F150 Lariat
Join Date: Nov 2008
Location: Canada
Posts: 103
Likes: 0
Received 0 Likes
on
0 Posts
A diesel engine may be able to run backwards for a bit, as it can run independant of the ignition, but a modern four stroke gasser cannot.
Two strokes sure, and older sleds do stall alot during the switch if they are not tuned well.
Two strokes sure, and older sleds do stall alot during the switch if they are not tuned well.
03-20-2009, 01:21 AM
#7
2004 F150 Lariat
Join Date: Nov 2008
Location: Canada
Posts: 103
Likes: 0
Received 0 Likes
on
0 Posts
Trending Topics
03-20-2009, 01:37 AM
#8
They pay me to drink
Oh boy... guys, let's take a step back.
4-stroke engines cannot run in reverse. There are reverse-rotation 4-strokes, but they require a complete redesign of the cam and valve timing, as well as several different parts to account for several design parameters.
2-stroke engines can run in reverse if you account for the different ignition timing requirements.
4-strokes aren't heavy because they need more head crank and cam. They aren't any heavier than a 2-stroke of the same size.
2-stroke engines can make a bit more power for their size because they fire every 2 strokes. 4-stroke engines need 4 strokes to fire once, which means for every power stroke, there are three wasteful non-power strokes. However, a 2 stroke engine is highly inefficient, doesn't last as long, and is horrible from an emissions standpoint.
4-stroke engines cannot run in reverse. There are reverse-rotation 4-strokes, but they require a complete redesign of the cam and valve timing, as well as several different parts to account for several design parameters.
2-stroke engines can run in reverse if you account for the different ignition timing requirements.
4-strokes aren't heavy because they need more head crank and cam. They aren't any heavier than a 2-stroke of the same size.
2-stroke engines can make a bit more power for their size because they fire every 2 strokes. 4-stroke engines need 4 strokes to fire once, which means for every power stroke, there are three wasteful non-power strokes. However, a 2 stroke engine is highly inefficient, doesn't last as long, and is horrible from an emissions standpoint.
