Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


torque converter sizing

torque converter sizing

torque converter sizing

How do manufacturers size torque converters for a particular vehicle? Do they do a trial and error until they get the characteristics they are looking for or are torque converters given classifications that can be used to size them for a particular vehicle weight, torque, etc? I'm trying to size one for my applications and am having a hard time selecting the correct one that will give them the characteristics I am looking for with any confidence.

RE: torque converter sizing

ISTR that the primary parameter used is 'stall speed', i.e., the input RPM where input torque and output torque (at zero speed) are the same. I also STR that it varies with the fifth power of diameter, so even a visually indistinct change can make a big difference in performance.

I remember one really low-buck hotrodder who replaced a 283 Chevy with a 348 Chevy in a rapidly aging Impala, back when that was a big car. To soup it up, he used the 283's converter behind the 348. I think the difference in converter OD was on the order of two inches, which is really quite a lot in converterland. The kid was hooning it around for about two weeks before he broke a rear axle control arm bolt or something like that. With the too-small converter, the big engine would spin up fast enough and far enough to annoy the neighbors, even when he wasn't trying to.

Mike Halloran
Pembroke Pines, FL, USA

RE: torque converter sizing

I'm pretty sure aftermarket manufacturers have programs to determine this, engine size, cam/power range, weight, gear ratio, etc. would all be entering arguments.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close