Bad pulley harmonics breaking timing chains??
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Bad pulley harmonics breaking timing chains?? I've heard a few stories of aftermarket timing chains breaking due to aftermarket pullies.....
I have an ASP pulley set and am wondering what risk I run of breaking a timing chain, and if there are any aftermarket timing chains out there that have had problems dealing with the different harmonics, and which timing chains seem to have no problems.
I have an ASP pulley set and am wondering what risk I run of breaking a timing chain, and if there are any aftermarket timing chains out there that have had problems dealing with the different harmonics, and which timing chains seem to have no problems.
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From: Leg Dist #31, WA
Re: Bad pulley harmonics breaking timing chains?? Well, I've broken 2 in 2 years. Had the Whisper pulley (no balancer), now have ATI.
Some fellers like to say it's bouncing offa the rev limiter that's causing me grief, but I think it's at least a combo...
Some fellers like to say it's bouncing offa the rev limiter that's causing me grief, but I think it's at least a combo...
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Re: Bad pulley harmonics breaking timing chains?? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by SSINFUL:
<strong>Well, I've broken 2 in 2 years. Had the Whisper pulley (no balancer), now have ATI.
Some fellers like to say it's bouncing offa the rev limiter that's causing me grief, but I think it's at least a combo...</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Just curiously, which timing chains were you running when they both broke???
Have you found one yet that has worked better for you?
<strong>Well, I've broken 2 in 2 years. Had the Whisper pulley (no balancer), now have ATI.
Some fellers like to say it's bouncing offa the rev limiter that's causing me grief, but I think it's at least a combo...</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Just curiously, which timing chains were you running when they both broke???
Have you found one yet that has worked better for you?
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Re: Bad pulley harmonics breaking timing chains?? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 99 Black Bird T/A:
<strong>Any new idea on this?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">LOL....I'm running ASP pullies and a JWIS timing chain....I'll keep you updated!
<strong>Any new idea on this?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">LOL....I'm running ASP pullies and a JWIS timing chain....I'll keep you updated!
Re: Bad pulley harmonics breaking timing chains?? My first ASP pulley I bought used, and it was out of balance. The pulley itself was damaged, and I didn't notice the slight wobble it has until after 2 yrs of running it <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> I had no chain breaks. Since then I have put a new ASP pulley on, and have no worries seeing that it's brand new and balanced.
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From: Phoenix, AZ
Re: Bad pulley harmonics breaking timing chains?? I remember talking to Strope about this last year when I did my H/C setup. They had a couple dynos on cars running the ASP pully. They all showed a hp/tq dip at ~5700rpm due to a harmonic imbalance. The only pully they recommended was the ATI because it was a true damping mechanism. Take a look at your dyno pulls from Xtreme and see if you see this dip. If you do, I'd recommend swapping that bad-boy out.
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Re: Bad pulley harmonics breaking timing chains?? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by FASST:
<strong>I remember talking to Strope about this last year when I did my H/C setup. They had a couple dynos on cars running the ASP pully. They all showed a hp/tq dip at ~5700rpm due to a harmonic imbalance. The only pully they recommended was the ATI because it was a true damping mechanism. Take a look at your dyno pulls from Xtreme and see if you see this dip. If you do, I'd recommend swapping that bad-boy out.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No dip at 5700rpms, however the line on the graph does become a little more jagged from 5700rpms on up.....the line seemed to be a bit more straight before that. Hmmm...maybe the ATI is something I should look into.
<strong>I remember talking to Strope about this last year when I did my H/C setup. They had a couple dynos on cars running the ASP pully. They all showed a hp/tq dip at ~5700rpm due to a harmonic imbalance. The only pully they recommended was the ATI because it was a true damping mechanism. Take a look at your dyno pulls from Xtreme and see if you see this dip. If you do, I'd recommend swapping that bad-boy out.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No dip at 5700rpms, however the line on the graph does become a little more jagged from 5700rpms on up.....the line seemed to be a bit more straight before that. Hmmm...maybe the ATI is something I should look into.
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From: Centrifugal City
Re: Bad pulley harmonics breaking timing chains?? Funny. I just ordered an Alum ATI Super Damper here. Was hoping it would dampen things better and put less wear on my crank bearings since I'm going with a V2-SQ Vortech.
It's 2.5 lbs lighter than stock for whatever that's worth. Might rev a bit faster?
It's 2.5 lbs lighter than stock for whatever that's worth. Might rev a bit faster?
