Which harmonic balancer?
 

Good morning.

Merc 454 Mag going 177 blower. Looking to replace old dried out balancer. What do you smart guys recommend? Motor will never see 5000 rpm.

Thanks!

I've been told by many reputable motor builders to stay away from Liquid filled balancers. Boats sit to long and the liquid will settle which in turn will break the snout off the crank.

I used these and they were of good quality

Excuse me for a second since I have known and helped swampy for prob over 12 years. Swampy, Don't get the dampners linked just above my post. A bunch have separated and flown across dyno rooms even. Doh !

Swamp, are your current 454's mark IV, gen V or Gen VI.

Has any one had issues with stock GMPD Dampners? for 5K and under use..

But 3 peeps have given them a 5 star rating...........:D

Before the engine or car or boat ever ran and went somewhere. It's the Ebay way. 5 stars ! Looks great.I'm sure will work as great. Quick shipping ! :)

Also run the same brand on my Mark IV 555. Nice piece for the price.https://cimg1.ibsrv.net/gimg/www.off...9555025409.jpg

Yes, if you're staying externally balanced, if you're internal then get a neutral balancer

depending on the build and balance --- 1 ATI balancers and then Power bond balancers by Dayco or vise versa. I believe dayco bought powerbond

fluidamper is my favorite but i have used the sfi approved powerbond balancer and i like them,a quality part at a fair price.

The powerbond ones are on my engines and Icdedppl's. They are a nice piece for the money. In your case, I'd go with those. Nice upgrade over the stock GM balancer. I had mine spun balanced and weight checked, and they were basically dead nuts to the GM ones I was replacing. Being a counterweighted unit, I didnt want to just bolt it on and go, so I paid to have them checked before install.

Of course ATI and Fluidampers are a step above, hard to go wrong with either of them.

Man if you are leaking any oil on to your stock balancers it seems overtime to cause an issue with a spun section and or the rubber will start coming apart.

Fluidamper used on every build for 30years must paint light even coat. if balancing damper must be removed from hub when balancing.

Mark IV

No...ran for years and still do..

i run boat weekly - year round (FL) - I was leaning toward Fluid Dampers until I saw the above.... now I'm waffling. Which ones specifically for a reasonably priced damper for a basically stock 454 mag? Keep in mind these wont see 5000 rpms.

ATI hands down.

Totally agree with the ATI like above ^^^^^^^^^ in post # 23 states.

The 540 ci 600 hp Volvo engines used GM dampeners. That being said, I dont know if they had issues with them.

I was in the same boat. I was worried about the balance issue being an external balance setup. Took my new powerbond balancers in along with my original gm balancers to the machine shop. They were within a C hair from each other. Was kind of a waste of money, but at least it made me feel better when buzzing along at 6k.

the factory gm balancer for your 5000 rpm application is fine.what happens to them is with years of use the rubber will break down,that can be a big problem.

I agree with mike. Mine were old, and the rubber wasnt looking the best. Plus im driving a blower off it, and the idea of a steel hub balancer just made sense . Other than that, i never had any issues with the stock gm balancers.