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

 

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!

 

Ditto. Reversion. Only way to stop hearing it is to put an OEM cover which will block the sound. After awhile, I stopped worrying about it.

 

Same here....and in fact stopped hearing it as a result.

 

Ok...Thanks Guys.

 

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.

 

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.

 

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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Yeah that ticky ticky is kind of aggravating isn't it?