Rear mount engine
Post Fiend
Joined: Sep 2000
Posts: 8,238
Likes: 3
From: Oregon
Like I said, she's pretty understanding 
You know, tweaker is aptly named. You guys should read some of his posts. He initiated a thread asking if you could add gunpowder to gasoline for more power. I'm thinking the gene pool is gonna be cleansed soon...
You know, tweaker is aptly named. You guys should read some of his posts. He initiated a thread asking if you could add gunpowder to gasoline for more power. I'm thinking the gene pool is gonna be cleansed soon...
Postmaster
Joined: Jul 2003
Posts: 2,711
Likes: 2
From: Pittsburgh
Ya'll are WAY over complicating this.
-A typical motor spins clockwise from the front of the vehicle and through teh transmission provides forward motion.
-Turn it around and it is now providing counterclockwise rotation from the front of teh vehicle and provides reverse motion
-get the motor to spin the other direction and it is now clockwise from the front of the vehicle and will hence provide forward motion
SO
Go to your local boat supplier and buy a reverse rotation cam for your motor (on twin engine boats one spins one way and the other the other way so as to provide counter torque to one another) if they both spun the same way you couldn't keep the boat in a straight line. On an auto tranny i believe you would also have to replace the pump, and on a manual you'd be running on the wrong side of the gear, but it's not like this thing would be a daily driver anyway.
Justin
-A typical motor spins clockwise from the front of the vehicle and through teh transmission provides forward motion.
-Turn it around and it is now providing counterclockwise rotation from the front of teh vehicle and provides reverse motion
-get the motor to spin the other direction and it is now clockwise from the front of the vehicle and will hence provide forward motion
SO
Go to your local boat supplier and buy a reverse rotation cam for your motor (on twin engine boats one spins one way and the other the other way so as to provide counter torque to one another) if they both spun the same way you couldn't keep the boat in a straight line. On an auto tranny i believe you would also have to replace the pump, and on a manual you'd be running on the wrong side of the gear, but it's not like this thing would be a daily driver anyway.
Justin
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Post Fiend
Joined: Jul 2003
Posts: 11,945
Likes: 3
From: Spokane, WA
I wish I knew more about boats. Ha! Checked into it and sure enough there are reverse rotation boat engines. So the only difference is the cam? Is the crank and all the rest the same? You could run an electric water pump and all that mess . . . not really a big deal I don't know about the oil pump but I'm sure they make an option for that too. I am curious what changes would have to be made to the tranny for this (auto of course 
). You'd have to have a reverse rotation starter but that's easy enough.
Good info Hox but what do you mean it won't be a daily driver?
). You'd have to have a reverse rotation starter but that's easy enough.Good info Hox but what do you mean it won't be a daily driver?
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
thats why I mentioned it earlier they use the exact same long block engine. and if you wanted to use a belt driven water pump just put a reverse rotation pump from a serp belt driven engine, and use a vbelt pulley on it. and the reverse rotation starter is available over the counter in a boat shop that carries parts for these things, also comp actually makes cams for them the last time I checked, and I imagine that the oil pump is also available probably from melling.
one problem you might have would be the powersteering pump not sure how you would work around that. I dropped that idea when you mentioned the trans cause not sure wether that can be done or not but anything can be done with enough money.
one problem you might have would be the powersteering pump not sure how you would work around that. I dropped that idea when you mentioned the trans cause not sure wether that can be done or not but anything can be done with enough money.
Elder User
Joined: Apr 2004
Posts: 650
Likes: 0
I wasn't aware that a 4 stroke engine could be made to turn backwards. Not doubting it, just never heard of it. wouldn't the torque converter refuse to function rotating backwards??? Arent the vanes, and such orientated for one way????
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Post Fiend
Joined: Jul 2003
Posts: 11,945
Likes: 3
From: Spokane, WA
I'm not worried about the PS pump. A serpintine belt system can fix that. I just need to talk to a tranny expert on what would be involved in running an auto reversed. I do a lot of driving and a lot of drinking (not at the same time) which allows me a lot of time to think up stupid projects like this. The best part would be seeing the look on people's faces when I put my groceries under the hood. OR you could fill the engine compartment with ice and cold beers! The ice would help your cooling system and the beers would help your friends.
OR you could fill the engine compartment with ice and cold beers! The ice would help your cooling system and the beers would help your friends.
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
yes the torque converter is also made to go one direction only as well as the pump, plus the one way clutches are just that, but like I said with enough money anything can be done. As far as a 4 stroke engine turning bacwards the only thing that would stop it is the valve opening/closing events need to be in order, and that is decided by the cam so put a reverse rotation cam in, and start it the opposit direction.
Posting Guru
Joined: Jul 2003
Posts: 1,268
Likes: 0
From: Eureka, Ca.
Over in the FE forum a guy bought a 427 cheap. The reason it was so cheap is that it was a revesve rotation engine from a boat. After getting all the parts he needed to go back to stock rotation. He put it in his truck and fired it up, a puddle of oil started building up on the ground under the rear of the block.
Anyone know why?
It was the crank. it was machined to keep oil in when rotating backwards when he reversed it. It pumped oil out the rear main seal.
Anyone know why?
It was the crank. it was machined to keep oil in when rotating backwards when he reversed it. It pumped oil out the rear main seal.
Elder User
Joined: Sep 2002
Posts: 525
Likes: 0
Anyone know anthing about the transfercases out of an m211 (old gmc duece) I know for a fact the front axle is reversed rotation because to run one with a different tcase you have to flip the centersection,they drop out like a nine inch ford. I belive the tcases are a single speed,and divorced mounted.so if you ran a married tranfercase on your transmission just to get high and low range then use the original front output on the m211 tranfercase as the input, you would end up with the other output shafts (the original rear output and the original input) turning the rightway. you would then not have to mess with the rotation of the engine or the axles. But i have never seen one and i dont know how heavy they are or if it would even be strong enough running backwards.
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