Visit The Dirt Forum for More Information

Author Topic:   Harmonic Balancers
smallrock98
Member
posted February 27, 2004 03:48 PM
I have a balancer that came off a chevy 305 engine and is smaller then the one on my 350. I am thinking about using this smaller one on my 350. To me, it is less weight. Is there a downside to doing this? Will it screw up the balance of my engine?


Ego Racing
Member
posted February 27, 2004 03:54 PM
How many RPM are you turning?


smallrock98
Member
posted February 27, 2004 03:56 PM
7,000


2nd2none
Member
posted February 27, 2004 05:35 PM
This is quoted from Bill Hendren from another board reguarding dampners.


The damper reduces the crank twisting or flexing with each firing pulse.the lighter the crank and the higher the torque [cylinder pressure] the more damper weight you need.we usually use the ATI 7.074 dia with the aluminum shell and steel crank hub.if you go to heavy you hurt the acceleration rate of the engine by a very small amount,if you go to light the crank will break in a short time


MEANGENE83
Member
posted February 27, 2004 05:46 PM
i've had no problems using the 305 balancers, but i'm not turning 'em that hard. make sure you get the right timing tab for the balancer if you do use one.


rico 08
Member
posted February 27, 2004 06:34 PM
The 305 balancer is the worst for coming apart,if you want lightweight i'd try a 283/327 balancer.As stated above most 305's timing marks/tab are behind the water pump.


BrianW
Member
posted February 27, 2004 08:25 PM
I've heard the 307 balancers are the better lightweight ones - has anyone else run one of these??


Racer111
Member
posted February 27, 2004 09:18 PM
Run a ATI they are the best.


Racer64
Member
posted February 27, 2004 09:34 PM
I have run the 307 style balancer from PDM for 3 years on an internally balanced 406 with no problems.


jay116
Member
posted February 28, 2004 09:09 AM
I used to believe the same thing. Smaller damper means less rotating weight which means more power. But I bought a book "How to build max performance on a budget"
written by David Vizard. He dynos all his motor combos and he found that the bigger balancers are better making more power.
He tested all kinds and if running a stock damper the larger heavier proved to be best.

------------------
Jason Boivin
http://www.rcracing-team.com


Racer111
Member
posted February 28, 2004 09:44 AM
I ran a stock one for years also with no problems until a stock one move and broke my crank in 3 parts.Never again will i use a stock junk balancer.ATI only.


Back to the Archives