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AKA Blownjet 468
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1,205 Posts
Discussion Starter #1
just curious what everyone else thinks, I know what I prefer
 

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Premium Member
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1,681 Posts
ATI or a Romac. Fluid if you want to buy a crank at some point.
 

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Bostick Racing Engines
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1,063 Posts
Haven't had any problems with the Fluidamper (I've run the small dia one due to weight of the 7 & 8 inch versions :)sphss)... that being said... I most certainly prefer and now use the ATI... it's just a better part imo.


Note about fluidamper... the 7 & 8 inchers are very heavy... so much so that at one point (don't know if it holds true in the last couple of years) that Crower wouldn't give ANY warranty on any of their smallblock crankshafts be it forged or billet if a fluidamper was used on a standard snout crankshaft.
 

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Premium Member
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25,975 Posts
Haven't had any problems with the Fluidamper (I've run the small dia one due to weight of the 7 & 8 inch versions :)sphss)... that being said... I most certainly prefer and now use the ATI... it's just a better part imo.


Note about fluidamper... the 7 & 8 inchers are very heavy... so much so that at one point (don't know if it holds true in the last couple of years) that Crower wouldn't give ANY warranty on any of their smallblock crankshafts be it forged or billet if a fluidamper was used on a standard snout crankshaft.
I seriously doubt its the weight that is causing the problem. First, they weigh less than a stock 375HP 327 HIPO damper, and a supercharger is harder on the snout than the weight of a damper, and we won't even discuss driving a boat and supercharger off the snout. The real reason the snouts break is that FLUIDAMPERS SUCK!



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Bostick Racing Engines
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1,063 Posts
I seriously doubt its the weight that is causing the problem. First, they weigh less than a stock 375HP 327 HIPO damper, and a supercharger is harder on the snout than the weight of a damper, and we won't even discuss driving a boat and supercharger off the snout. The real reason the snouts break is that FLUIDAMPERS SUCK!
I can totally see this turning into a Ford vs Chevy type deal...:D

Hey man... tell that to them then... I was there a few years back when Crower was still in Chula Vista and Reed, Kerry, and Dave were "discussing" with an angry customer why they would not replace a crankshaft that broke the snout off... the reason I got from Reed Oliver was what I just stated. No matter "why" it broke... weight... harmonics... or a built in self destruct device designed in them by terrorists... the reason for the failure was the fluidamper... run fluidamper + broke crank = no warranty... Crower's policy... not mine.

Now... again I have ran one on my gullwing for many years without an issue... no broke cranks... no problems... going on 10 years now on the 6 3/4 dia. BUT... the reason I went with it was I was a young lad (21) and didn't know better and back then when someone donates good used hotrod parts to your cause... you use them if they will work... oddly enough the reason I got the fluidamper was we put a new ATI on the hotrod... I got hand me downs and thought it would be better than the stock 7" 427 balancer I was using.:)sphss

That being said... I won't use them on any customers or anything new I build for myself... they just ain't what they were touted up to be back in the day. The ATI is a much better part... testing and time shows that.

This is one of those subjects where everyone will have their own opinion and will use anecdotal "evidence" as universal "FACT"... the fact of the matter is... there will be dozens of folks that run a fluidamper and never have an issue... just as there will be folks that run ATI and never had an issue. From my perspective and experince in both research and in service... the ATI is a better part and does the dampening job more effectively... but that is just my opinion.
 

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Bostick Racing Engines
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1,063 Posts
Blownjet 468, did you ever see a Fluidamper with a 6 bolt blower pulley pattern including a 2" centering pilot? Ever tried to buy one? Shelf stock item for ATI.
Also available from BHJ... fyi.
 

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Premium Member
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25,975 Posts
I can totally see this turning into a Ford vs Chevy type deal...:D

Hey man... tell that to them then... I was there a few years back when Crower was still in Chula Vista and Reed, Kerry, and Dave were "discussing" with an angry customer why they would not replace a crankshaft that broke the snout off... the reason I got from Reed Oliver was what I just stated. No matter "why" it broke... weight... harmonics... or a built in self destruct device designed in them by terrorists... the reason for the failure was the fluidamper... run fluidamper + broke crank = no warranty... Crower's policy... not mine.

Now... again I have ran one on my gullwing for many years without an issue... no broke cranks... no problems... going on 10 years now on the 6 3/4 dia. BUT... the reason I went with it was I was a young lad (21) and didn't know better and back then when someone donates good used hotrod parts to your cause... you use them if they will work... oddly enough the reason I got the fluidamper was we put a new ATI on the hotrod... I got hand me downs and thought it would be better than the stock 7" 427 balancer I was using.:)sphss

That being said... I won't use them on any customers or anything new I build for myself... they just ain't what they were touted up to be back in the day. The ATI is a much better part... testing and time shows that.

This is one of those subjects where everyone will have their own opinion and will use anecdotal "evidence" as universal "FACT"... the fact of the matter is... there will be dozens of folks that run a fluidamper and never have an issue... just as there will be folks that run ATI and never had an issue. From my perspective and experince in both research and in service... the ATI is a better part and does the dampening job more effectively... but that is just my opinion.
Perhaps you misunderstood my post. I actually believe the crank failed due to the Fluidamper. No arguement from me on that one. Like I said, seen alot of cranks snouts take alot of abuse in circle racing. I was just saying I don't believe its a weight thing. Its a chitty damper thing. Maybe it was just easier for Crower to say its because they are to heavy rather than get into a pissing match about the BS design theory of the Fluidamper. Most people who run Fluidampers know very little as to the theory behind them, where the technology originated, and where the vast majority of there product income comes from. Most who do know, don't run them. Personally, I perfer to run a damper that was built from the ground up to be a racing damper. The fact that it is the ONLY APPROVED damper in NASCAR doesn't hurt their image in my eyes either.
You are one of the few that has run both and realizes the differences from experience. BHJ makes a nice damper, and I didn't know they made a blower damper. Good to know. Just prefer the "dual element" design and enclosed/captured enertia weight ring of the ATI. The only other damper I feel is worth a damn is the Fisher. Alittle something interesting, look to see how many crankshaft companies actually distribute Fluidampers as opposed to say BHJ. And whose dampers they want hanging off their crankshafts. That right there should tell you something.



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Distinguished Member
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5,780 Posts
you need a balancer?
Man, that's what I was thinking :)sphss. I went out and looked, I think I got ripped off... I aint got one:mad:

Seriously though, how many of you know what a balance actually does? Hint, it don't balance chit:)
 

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Amber Racing Services
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4,339 Posts
Man, that's what I was thinking :)sphss. I went out and looked, I think I got ripped off... I aint got one:mad:

Seriously though, how many of you know what a balance actually does? Hint, it don't balance chit:)
I didn't run on my blower engines. Never had an issue. Hmmm :)sphss
 

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AKA Blownjet 468
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1,205 Posts
Discussion Starter #20
Blownjet 468, did you ever see a Fluidamper with a 6 bolt blower pulley pattern including a 2" centering pilot? Ever tried to buy one? Shelf stock item for ATI.
hey, I never said I was looking for advice on this topic, and I did say I
already have my prefered piece, which is of course, the ATI. although
there was a time when I thought that the fluidampner might be somthing
worth looking into, cuz why would ALL the big power diesel engines run
them( I'm a heavy equip/truck mech.) then I started thinking about it
(btw, I'm talkin' 18-20yrs ago) all those engines turn a max of 2200rpm!
my choice has always been - if it's blown, run a hub, if it's not, and it's
gonna see the high side of 6500+, the ATI IS the only way to go!( or the
Fischer, which I always thought of as kinda the early model ati -in design
anyway) never really wanted to hang a dampner on w/ a big blower/drive
setup, too much stress on the snout, and I've never had any problems
with running just the hub,pulley,belt setup on a blown deal..so fire away!
 
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