Watch vid pls.......normal?
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Road Captain
Joined: Feb 2012
Posts: 578
Likes: 22
From: Ontario, Canada
Watch vid pls.......normal?
I installed a set of Andrews 57H in my Glide and have a tapping from the breather. I know there can be some throttle body noise with certain cams. Is that what I'm hearing? I just want to know if that is "normal" or if I need to be concerned.
It's hard to hear thru a phone or laptop but noticeable when listening on a speakered desktop or earbuds...Thanks in advance for any insight
It's hard to hear thru a phone or laptop but noticeable when listening on a speakered desktop or earbuds...Thanks in advance for any insight
Road Master
Joined: Jul 2010
Posts: 1,042
Likes: 86
From: Centeral Coast, California
Sounds to me like reversion, which is completely normal once high performance cams are installed and with an open intake like you have.
Your bike sounds good to me. Let's see what some other say.
Looks good too!
Your bike sounds good to me. Let's see what some other say.
Looks good too!
Last edited by gipper; Feb 5, 2018 at 09:21 AM.
Road Master
Joined: Jul 2010
Posts: 1,042
Likes: 86
From: Centeral Coast, California
Same here....and in fact stopped hearing it as a result.
Road Master
Joined: Jul 2010
Posts: 1,042
Likes: 86
From: Centeral Coast, California
Although it sounds like tapping, it's actually sound reverberating within your throttle body that escapes out your intake. I don't really understand why it happens with a more extreme cam over stock, but I know that we all get it once we put higher performing cams in. Others can explain "the why" much better than I can.
Tourer
Joined: Mar 2010
Posts: 428
Likes: 35
From: Calgary Alberta Canada
Reversion. Caused by the higher overlap of the valve openings and closings due to cam profile. Same on mine with Woods. Don't even hear it anymore.
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Joined: Jul 2015
Posts: 8,538
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From: SF Bay area
I'd agree with reversion, the 57 is famous for it. When I had 57s in my Limited with an open backed Ness Big Sucker AC the noise was maddening. I ended up going back to a stock AC.
John @ Rockout
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John @ Rockout
__________________________________________________ ____
For ROCKOUT information & purchasing please click HERE For all Twin Cams and Evo Big Twins & Sporsters
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NO, they DON'T all do that!
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I’m sorry for the possibility of a dumb question, but, do the anti-reversion baffles in Rineharts help with this? Or is it an entirely different scenario? Everybody’s knowledge has to start somewhere.