Heads upgraded
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Grand HDF Member
Joined: Jun 2013
Posts: 4,998
Likes: 864
From: Iowa
Heads upgraded
So I installed an HPI 51mm bore throttle body with 4.9 gps injectors with some FM Level B ported heads with some other toys. Runs great after some tuning. The front end lifts on every gear change under hard acceleration. I wasn't expecting the bit more of valve train noise though. I saw that DJL mentioned the improved valve springs can cause some more valve train noise. Have others found this to be true?
Outstanding HDF Member
Joined: Mar 2015
Posts: 2,840
Likes: 900
From: Philly Suburbs
I have a very different engine than yours (88 up to 97, carbureted), but I've found the same thing. I'm running S&S 585s and have a lot of headwork, topped with stiff beehive springs (I have better specs somewhere in my notes). I've adjusted pushrods several times (I've tried preload from .125 to .145) and installed Rockout bushings. The top end is definitely noticeably louder than it was pre-build (although it wasn't stock then either).
Stellar HDF Member
Joined: Mar 2017
Posts: 3,312
Likes: 1,878
From: Conn.
After I had my heads done with high lift springs and bigger valves I did notice more valve train noise. The hammer is coming down harder! Loudest at 2500 rpm silent at 3000. Louder with synthetic oils. I hardly even notice it anymore. You will get used to it. Not crazy loud but noticeable.
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Joined: Jul 2015
Posts: 8,538
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From: SF Bay area
After I had my heads done with high lift springs and bigger valves I did notice more valve train noise. The hammer is coming down harder! Loudest at 2500 rpm silent at 3000. Louder with synthetic oils. I hardly even notice it anymore. You will get used to it. Not crazy loud but noticeable.
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For ROCKOUT information & purchasing please click HERE For all Twin Cams and Evo Big Twins & Sportsters
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NO, they DON'T all do that!
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Ordering & info http://www.rockout.biz On ebay! ... CLICK HERE
Also on amazon.com...
Imitated, never equaled... ROCKOUTS!
Tourer
Joined: Aug 2018
Posts: 337
Likes: 214
From: California
I just finished a 100 inch build. S&S cylinders, pistons, heads and the 585 cams. I also did the rocker lockers. Still have noise. Its different than the rocker arm shaft tap but it is there. Fades at 3k and up though.
Stellar HDF Member
Joined: Mar 2017
Posts: 3,312
Likes: 1,878
From: Conn.
That is THE classic symptom of rocker shaft tapping. There is help
__________________________________________________ ____
For ROCKOUT information & purchasing please click HERE For all Twin Cams and Evo Big Twins & Sportsters
__________________________________________________ ____
For ROCKOUT information & purchasing please click HERE For all Twin Cams and Evo Big Twins & Sportsters
Stellar HDF Member
Joined: Mar 2017
Posts: 3,312
Likes: 1,878
From: Conn.
I remember cavaria posted when he was ridding back roads he was counting on his valve train noise to scare and keep deer from crossing his path. I thought that was hilarious!
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Tourer
Joined: Apr 2007
Posts: 438
Likes: 57
I wish I had loud heads. Will have to live with the stock, quiet ones until more funds become available.
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Thread Starter
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Grand HDF Member
Joined: Jun 2013
Posts: 4,998
Likes: 864
From: Iowa
That is THE classic symptom of rocker shaft tapping. There is help
__________________________________________________ ____
For ROCKOUT information & purchasing please click HERE For all Twin Cams and Evo Big Twins & Sportsters
__________________________________________________ ____
For ROCKOUT information & purchasing please click HERE For all Twin Cams and Evo Big Twins & Sportsters