Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Engineering/Technical
Engineering/Technical Ask technical questions about cars. Do you know how a car engine works?
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools
Old 06-16-2007, 03:13 PM   #1
ss_chevy
AF Newbie
 
Join Date: Jun 2007
Location: Benton, Kentucky
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Multiple Gear Ratios in Reverse???

I'm a relatively new technician, but i've heard that on certain vehicles you can flip the output ring gear in the transmission and achieve 3 reverse ratios and 1 forward. Is this possible, if so on what vehicles? Thanks
ss_chevy is offline   Reply With Quote
Old 06-16-2007, 03:14 PM   #2
ss_chevy
AF Newbie
Thread starter
 
Join Date: Jun 2007
Location: Benton, Kentucky
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Multiple Gear Ratios in Reverse???

yeah i got the engine operation
ss_chevy is offline   Reply With Quote
Old 06-16-2007, 05:29 PM   #3
GreyGoose006
AF Enthusiast
 
Join Date: Mar 2006
Location: Norfolk, Virginia
Posts: 1,687
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Multiple Gear Ratios in Reverse???

why would you want that?
i guess that it is theoretically possible, but rather useless.
cars are pretty unstable in reverse. high speed can only make this worse.
the only possible use for this that i can see would be in a destruction derby car where the low gearing prevented speeds over 45-ish anyway and the two lower reverse gears were for extra torque.

note:
in a destruction derby, the ideal way to ram a car is with your rear end...
there is no engine to mess up.
GreyGoose006 is offline   Reply With Quote
Old 06-16-2007, 09:39 PM   #4
UncleBob
AF -Advisor
 
Join Date: Feb 2006
Location: Seattle, Washington
Posts: 1,482
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Multiple Gear Ratios in Reverse???

Quote:
Originally Posted by ss_chevy
I'm a relatively new technician, but i've heard that on certain vehicles you can flip the output ring gear in the transmission and achieve 3 reverse ratios and 1 forward. Is this possible, if so on what vehicles? Thanks
only on cars made in france
__________________
life begins at 10psi of boost

Three turbo'd motorcycles and counting.
UncleBob is offline   Reply With Quote
Old 06-16-2007, 09:42 PM   #5
KiwiBacon
AF Enthusiast
 
Join Date: Jul 2006
Location: Otago
Posts: 849
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Multiple Gear Ratios in Reverse???

Quote:
Originally Posted by ss_chevy
I'm a relatively new technician, but i've heard that on certain vehicles you can flip the output ring gear in the transmission and achieve 3 reverse ratios and 1 forward. Is this possible, if so on what vehicles? Thanks
You'll be able to flip the diff over in most cars. Of course you may have issues with it fouling other parts of the housing.

I'm not sure why you'd want to though.
KiwiBacon is offline   Reply With Quote
Old 06-19-2007, 01:29 AM   #6
zagrot
AF Regular
 
Join Date: Dec 2004
Location: panama city, Florida
Posts: 243
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via Yahoo to zagrot
Re: Multiple Gear Ratios in Reverse???

that would be useful if you wanted to rearrange the drive train layout. there is a car manufactured by ultima motorsports (three or four models, actually) that uses a porsche transmission but the engine is installed ahead of the transmission (and it happened to be a large v8, i highly recomend looking at the gtr at ultimacars.com). i believe that i remember the webpage that featured the car referring to the transmission as being "reverse rotation" and for a long time i suspected that the ring gear was installed opposite of normal to facilitate forward motion even tough the transmission was oriented "backward." some pictures that i've seen of the smaller club racing cars built around the aircooled vw drivetrain were the same, the whole thing was turned around to achieve a more balanced car.
zagrot is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD

Go Back   Automotive Forums .com Car Chat > Engineering/Technical

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 05:05 PM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts