×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

V6 crankshaft balance factors.

V6 crankshaft balance factors.

V6 crankshaft balance factors.

(OP)
Hello gentlemen,
I have a question regarding V6 crank balancing. The engine is a 60degree V6. I fabricated dedicated half-ring shaped counterweights which are fixed on the rod journals for dynamic balancing (there are no accessories available in my area for balancing V engines!). The weight was determined by the usual practice (100% rotating+52% reciprocating). Calculations were based on standard pistons. However, I now have a set of forged pistons, weighing ~20% less than the std items. If I calculate backwards using the reduced weight, it turns out that my balance factor is now ~58%. If I leave things like this, what negative effects (if any) can I expect? Is it absolutely imperative that I must use a factor from 50-55% and no more? All bits and pieces of literature on the subject point to the choice of balance factors being a 'black art'.  

RE: V6 crankshaft balance factors.

The negative effect is that your crank is bit heavy. I wouldn't sweat.

Choice of balance factor is a black art, unless you analyse the crank in great detail. The correct approach is to minimise the main bearing loads in some fashion.

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

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!


Resources