Visit The Dirt Forum for More Information

Author Topic:   305 balancer?
racer17j
Dirt Forum Champ
Total posts: 1565
posted May 13, 2002 01:18 PM UIN: 54865418
will a balencer off a 305 work for a 350 i noticed last nite mine had slipped bad and before i go out an spend more money i don't have thought i would ask beings i have a 305 out in the shed that i was going to use for scrap weight anyway

BK19
Dirt Freak

Total posts: 285
posted May 13, 2002 02:32 PM UIN: 40696038
yes it will just make sure you use the timing cover off of the 305 also

c21
Dirt Freak

Total posts: 346
posted May 13, 2002 03:45 PM
While it may fit, it is not suited for the 350. Each balancer is designed for a specific rotating assembly (stroke, component weights, etc). Get the right balancer.

LUBEGUY07
Dirt Maniac

Total posts: 156
posted May 13, 2002 06:55 PM
hey 17j u can buy a new one from midwest for 59 or 69 dollars if u whant a used one for a 350 let me now we have a few laying around


LUBEGUY07
Dirt Maniac

Total posts: 156
posted May 13, 2002 06:58 PM
i just looked in midwest motorsports catalog and they are only 44.99 thats the same one we use

BK19
Dirt Freak

Total posts: 285
posted May 13, 2002 08:25 PM UIN: 40696038
i have used the 305 balancer for 6 years and never had a problem

o5racer
Dirt Maniac

Total posts: 115
posted May 13, 2002 10:36 PM
all small block balancers are balanced the same. the only exception is the 400 balancer, it has a cutout to balance the assembly. all other small blocks are internally balanced. they are actually a dampener not a balancer.

WesternAuto17
Dirt Freak

Total posts: 248
posted May 14, 2002 09:29 AM
If 30 and 350 dampers are the same, wht are they different sizes?

o5racer
Dirt Maniac

Total posts: 115
posted May 14, 2002 10:20 PM
GM used both size balancers on both engines. it just depends on what they wanted to use that year. i havent seen any pattern on them out of all the engines ive stripped.

racer17j
Dirt Forum Champ
Total posts: 1565
posted May 14, 2002 10:43 PM UIN: 54865418
thanks for the help guys i broke down and bought a new one i did notice that in my summit cat it has a 6 .75 and a 8 in for small blocks and then a 400 so sounds to me like it would have been just fine but my luck that one would have been slipped too

BK19
Dirt Freak

Total posts: 285
posted May 15, 2002 07:33 AM UIN: 40696038
from what i learned the smaller one is because the pistons are lighter this is what ive been told but they will work on the 350

bbchs
Dirt Full Roller

Total posts: 30
posted May 15, 2002 08:36 PM
All small block's with the exception of the 400 are internally ballanced. You can run the dampner off of any internally ballanced small block on any other internally ballanced small block. The ballance is in the rotating assembly, not the dampner. We run a dampner and timing cover off of a 327 early. It's a lot lighter than a 350 dampner but the down side is that it does a lousy job of dampening harmonics. Just the same in twenty years can't say we have any problems because of the dampner.

Good luck...Chuck

Eljojo
Dirt Freak

Total posts: 273
posted May 19, 2002 05:49 AM
The difference is in the location of the timing mark. (ex 400) If you place the 305 (or any other) balancer on top of your original balancer, you can relocate the timing mark---thus you are able to properly time your engine without removing and replacing your timing cover.
IMHO--and correct me if I'm wrong-- a motor which is either accelerating or decelerating produces no harmonics. Therefore a balancer on a stock car is as useful as tits on a boar. I've got a nice GM one on mine----but I think that it's just there because every one else has one!

WesternAuto17
Dirt Freak

Total posts: 248
posted May 20, 2002 09:05 AM
Eljojo -

I don't know what you're talkin about. I left the cruise control on my car for coasting down the backstretch. Its just that fast.

Just kiddin.

[This message has been edited by WesternAuto17 (edited May 20, 2002).]

NRG77
Dirt Full Roller

Total posts: 31
posted May 28, 2002 01:13 AM
Why do you all run harmonic balancers? or dampeners for that matter. we come from sprint cars and none of them have anything on the front of the crank except for the water pump. (350 or 410's) No flywheel either. You can internally balance any engine (I think) so why bolt all that rotating weight onto the front of the motor? Is it just tradition or is there another reason I don't know of???

DirtDobber
Dirt Forum Racer

Total posts: 79
posted May 28, 2002 12:02 PM
NRG77 We tried plugging the hole with bubble gum but it kept falling out!!

Just kidding!!

Does it really add that much to the rotating weight? I am running in the bomber class - if that could help with the acceleration I would try it. I would just have to make sure the engine is balanced well right?

Scoot
Dirt Freak

Total posts: 330
posted May 28, 2002 09:50 PM
What would you use in place of it?

------------------
Scoot
Smith Racing Team
870-365-5989

ryan
Dirt Freak

Total posts: 430
posted May 29, 2002 12:09 AM
Do a search on harmonic balancers in engine tech talk there are some good answers there.

NRG77
Dirt Full Roller

Total posts: 31
posted May 30, 2002 01:26 AM
Coleman makes an aluminum sprint car style water pump crank shaft drive hub. We took it to a machinist and had it turned down and drilled to match our lower pulley. It weighs almost nothing and works just fine. As far as rotating weight goes, even 1 ounce more is too much. ANY rotating weight robs your engine of horsepower, don't believe me, reduce your rotating weight and then put your motor on the dyno.

racer17j
Dirt Forum Champ
Total posts: 1565
posted May 31, 2002 01:29 PM UIN: 54865418
77 thats all well and good but if i could afford sprint car parts i'd drive a sprint car lol. i don't even take my motors to a machine shop unless they need bored.this motor i have right now is about as stock as they come i have about $400 in it now that i bought that new balancer and she runs just fine you can ask the lube guy about that he seen it first hand on a heavy track last week but i guess if you have the time and money go right ahead and run without i guess but i can't afford to expirement and test

dirttrackracer
Dirt Newbie

Total posts: 0
posted June 01, 2002 10:22 AM
Sprint cars rebuild quite often,and the water pump on the front does have some cushioning effect over running nothing at all.

NRG77
Dirt Full Roller

Total posts: 31
posted June 02, 2002 12:47 AM
Well I took Ryan's advice and checked all the posts on harmonic balancers....apparantely the water pump on a sprint car as it is connected directly to the crank acts as a fluid dampner reducing harmonic vibrations at high RPM. I have a pretty light weight dampner, I think I'll put it back on, I have about 12,000 in my motor and that's a lot to risk.

BayouGent
Dirt Forum Racer

Total posts: 87
posted June 02, 2002 10:56 PM
I've only seen a "pulley mount" if you want to call it that in the place of a harmonic balancer in a few hi-performance marine applications. I don't think these guys were turning those marine engines up like we do in some of these cars though.

Back to the Archives