Login    Forum    Search    FAQ

Board index » Racing Forum » Engine & Cylinder Head Tech




Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: Balancing
 Post Posted: Tue Jan 05, 2010 12:58 am 
Offline

Joined: Sun Apr 30, 2006 6:20 am
Posts: 357
Location: Wodonga, Australia
Hey guys

Engine was balanced with piston and pin package that weighed 584 grams, new piston and pin package weighs 590 grams. Who would run the new pistons without re balancing and who would re balance.

Trev

_________________
VK Commodore
383 Holden
2 speed Glide
Everthing on this car is all done by myself
650 HP Plus 300 Nos
Best so far
1.38 60 ft, 6.3 1/8 at 110 mph and 10.2 at 135 mph, long way to go before i reach my low nine hey


Top 
 Profile  
 
 Post subject: Re: Balancing
 Post Posted: Tue Jan 05, 2010 1:01 am 
Offline
Site Admin
User avatar

Joined: Tue Apr 18, 2006 6:38 am
Posts: 11804
Location: Coming At Ya!
I would! They normally don't get any closer than 4 grams to begin with.

_________________
Big Boyz Toyz!

Image

Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves.

William Pitt, British Prime-Minister (1759-1806)


Top 
 Profile  
 
 Post subject: Re: Balancing
 Post Posted: Tue Jan 05, 2010 9:57 am 
Offline
User avatar

Joined: Wed Apr 19, 2006 4:11 pm
Posts: 2749
Location: Shepherdsville, KY
I'd run it like it is. I've been told that a few grams don't make any difference. I guess it depends on how hard you spin it, maybe if you were getting into that 10k rpm range you would have to worry...

_________________
Chuck Woloch

Chuck's Automotive
Full line Computech dealer
chucksautomotive@yahoo.com
Image


Top 
 Profile  
 
 Post subject: Re: Balancing
 Post Posted: Tue Jan 05, 2010 10:20 am 
Offline

Joined: Sat Feb 24, 2007 6:55 pm
Posts: 847
Location: NW MO.
If the engine was balanced with an over balance, (typical around here) odds are you still have a little over balance.

Lets say the bobweight used to balance your crank was 1750 grams.(a guess) Since just one pistons weight is used to come up with the bobweight on a 90* v8, you would change the bobweight 6 grams. 6/1750=.0034285% change in the bobweight. The typical over balance is 1-2%. 1% of 1750= 17.5 grams.

_________________
Slow racing is better than no racing!

Randy


Top 
 Profile  
 
Display posts from previous:  Sort by  
 
Post new topic Reply to topic  [ 4 posts ] 

Board index » Racing Forum » Engine & Cylinder Head Tech


Who is online

Users browsing this forum: No registered users and 3 guests

 
 

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
cron