harmonic balancer

AA wrote:

Removal = less weight, so I can see that. But I don't get why one would spend $250+ on a neutral shaft from ZZP.   Why not plug the oil galleys for free?

Because people will buy "options".

Charlie, why on earth would we want to run against a 9 sec Camaro?   

It's not so much that we want to run against the camaro..

Bill wants to see what we can do and he said he would be down for a meet at Milan.

I saw that Camaro in his garage (think it ran 10 sec at the time). I remember it used a set of red HS rockers!

Maybe it's his Nova that runs 9s.

I dont know, but he's a racer and he wants to see our Rivs on the track.

He's a cool dude.

I've been in some GTPs and Regals where the missing balance shaft makes a difference. They have a much tighter mounting system though, and these usually had poly bushings in the dog bones to make it worse. The Riv has a very soft engine mount so you won't notice the engine vibration as much, but it's definitely there.

Anybody running one of these?
http://zzperformance.com/3800/pulleys-belts/8-rib-sfi-balancer.html



per ZZP: It is only safe to spin an L67/L32 to ~6300 rpm on a stock balancer. Going over that can cause bearing failure, flex plate failure and power loss due to harmonics.


I am trying to rev at or a little higher than 6300 rpm.. thinking i should probably invest in one of these?

Stock balancer still intact, has survived multiple trips to 6k RPM, but I don't rev that high anymore. If I needed a new one, this one looks like a pretty good one. Consider it is 3 lb heavier than stock, so there is slightly added parasitic load, but you won't likely notice (lighter crank pulleys offer very slight HP advantages at very high RPM, also not noticeable).

I would think those would be more for those who need an 8 rib setup due to belt slip (Turtle). Most L67 setups don't make much power in the high RPM ranges anyways unless they're turbo swapped, so isn't it kind of pointless to go that high?

matt270avian wrote:

I would think those would be more for those who need an 8 rib setup due to belt slip (Turtle). Most L67 setups don't make much power in the high RPM ranges anyways unless they're turbo swapped, so isn't it kind of pointless to go that high?

XP cam is to rev up to 6700RPM per ZZP

I don't think you will really benefit until you have high-flow heads and bigger exhaust. Then it could get interesting above 6k RPM - if your blower can keep up (twin-screw or turbo time).

($$$$$$$$$$$$$$$$$$$$$$)

charlieRobinson wrote:

matt270avian wrote:

I would think those would be more for those who need an 8 rib setup due to belt slip (Turtle). Most L67 setups don't make much power in the high RPM ranges anyways unless they're turbo swapped, so isn't it kind of pointless to go that high?

XP cam is to rev up to 6700RPM per ZZP

huh. well I guess you'd better do it then.

That's the balancer I'm running. No trouble with it that I'm aware of. There's a mixture of reasons to use it. None of them alone are enough but it would be highly justified if your original has the circumferential dry cracking, you anticipate going to an 8rib belt, want to go ham with the xp. The cam is good to high rpm, the heads and whatnot might not be.

AA wrote:

I don't think you will really benefit until you have high-flow heads and bigger exhaust. Then it could get interesting above 6k RPM - if your blower can keep up (twin-screw or turbo time).
($$$$$$$$$$$$$$$$$$$$$$)

I dont know. ZZP says 6700 RPM with XP on stock heads. Only a dyno or turbo tim email might tell..

My cutoff has been set at 6400 with 6100 max shift point since I installed. I wasnt even aware the balance pulley was a weak point until I found that page today. If they say max rpm with stock pulley is 6300 then fug it. Im going to upgrade just to be safe and confidently experiment with higher RPM shifts.

turtleman wrote:

That's the balancer I'm running. No trouble with it that I'm aware of. There's a mixture of reasons to use it. None of them alone are enough but it would be highly justified if your original has the circumferential dry cracking, you anticipate going to an 8rib belt, want to go ham with the xp. The cam is good to high rpm, the heads and whatnot might not be.

Thanks Cody. I am definitely going 8 rib someday. Heads will only happen if ZZP offers 20% everything in their store and I can get those aluminum heads at a discount.. Plan on taking xp and bottom end to max potential with this build.

My second Riv will be the 600WHP+ racer build. This Riv is just my DD. Riv for life.

Even if its not needed, 8 rib just looks sweet.