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Re: Cam Button
[Re: barracudabob]
#1597050
03/23/14 02:24 AM
03/23/14 02:24 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I havent built a BB in years but I've only put a button on a roller cam.. the ramp angles on the lobes keep it rearward... I'm sure one of the BB guys will jump in and help you out 
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Re: Cam Button
[Re: MR_P_BODY]
#1597051
03/23/14 09:46 AM
03/23/14 09:46 AM
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Joined: Jan 2003
Posts: 21,073
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,073
Niles , Ohio
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No need for a button.Only time is with a roller or gear drive.Like Mike said the way the cam goes in keeps it in place.Rocky
Chrysler Firepower
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Re: Cam Button
[Re: Stanton]
#1597056
03/23/14 10:55 AM
03/23/14 10:55 AM
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Joined: Mar 2012
Posts: 220
Jerry Kathe
enthusiast
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enthusiast
Joined: Mar 2012
Posts: 220
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Quote:
Forget "cheap insurance", it TOTALLY UNNECESSARY unless its a roller cam! With 16 valvesprings putting pressure on the ramps of the cam it ain't gonna move forward.
And there's no such thing as a "drop in" cam button, nobody makes one that will go in and fit properly without some modification to either the button or the timing cover. And that raises another point - you need to modify the stock cover or use an aftermarket cover for the support necessary to prevent forward movement of the cam.
You don't need the button and you don't need the hassle.
But if you don't listen to our advice and insist on installing one, avoid the aluminum one's like the plague - they will gall up and little bits will fall off into the motor.
WOW....
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Re: Cam Button
[Re: Jerry Kathe]
#1597057
03/23/14 12:43 PM
03/23/14 12:43 PM
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Joined: Oct 2005
Posts: 8,874
Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,874
Ontario, Canada
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Quote:
In nearly every case the cam will jump forward and the adjacent lifters will contact the neighboring lobes.
Really?? In "nearly every case". Really ?? I think we need to take a poll here !!
There are hundreds of thousands of stock engines out there - wait, make that MILLIONS - with no cam buttons and the cam doesn't budge. This is with the same taper on the lobe and much lighter valvesprings than a performance cam would have.
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Re: Cam Button
[Re: barracudabob]
#1597059
03/23/14 01:05 PM
03/23/14 01:05 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I would say that 99.9% of the BB guys that run a solid flat tappet.. or hyd cam dont use a cam button... unless it was in there on a previous build that went from a roller to a flat tappet....no need for it.. but I'm a SB guy and we dont use them... at all
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Re: Cam Button
[Re: barracudabob]
#1597063
03/23/14 02:08 PM
03/23/14 02:08 PM
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Joined: Mar 2012
Posts: 220
Jerry Kathe
enthusiast
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enthusiast
Joined: Mar 2012
Posts: 220
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To the OP; The cam button suggested by your builder was most likely in the form of an inexpensive safety device. In “your” application the block face carries the thrust load. The button is simply used to control travel in the case of driven load changes that create cam walk. In the case of a broken chain at high RPM, the driven load change between the crank and cam is so rapid that it will literally try to pitch the cam OUT of the block. Even a plastic button in your case is sufficient; you can buy them for less than 15.00 SHIPPED! Your engine builder is looking out for your best interest…….OR………you could listen to keyboard builders and simply use the option to forgo the button. But food for thought – if your technical adviser uses an aluminum button and suffers “avoid the aluminum one's like the plague - they will gall up and little bits will fall off into the motor” – syndrome, then your may want to use a different resource - I don’t know, just a guess… 
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Re: Cam Button
[Re: AndyF]
#1597067
03/23/14 05:30 PM
03/23/14 05:30 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I designed a cam button assembly to work with the billet timing chain covers that I make. This setup is designed for roller cams but will work with flat tappet cams also. The center section can be removed for inspection and/or cam timing adjustment. Most folks don't need parts like this but they do make life easier if you're building serious race engines.
I like that set up Andy... the eccentric for changing
the cam timing is nice even with the little marks
on it... thats one time that I wouldnt mind being
a BB guy
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Re: Cam Button
[Re: barracudabob]
#1597068
03/23/14 07:23 PM
03/23/14 07:23 PM
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Joined: Dec 2004
Posts: 10,554
Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,554
Rittman Ohio
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I have wondered the same thing because when I removed my timing cover for the winter inspection I can see where the cam bolts were rubbing on the stock timing cover. I'm just going to use that plastic one that BG recommended because what could it hurt Gus 
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
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Re: Cam Button
[Re: B G Racing]
#1597070
03/23/14 11:46 PM
03/23/14 11:46 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
master
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master
Joined: Jul 2006
Posts: 4,179
California
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Quote:
Get the teflon Comp Cam button for use with stock style chains and gears and stock timing covers.They are easy to cut down and trim for fit.They eliminate the chance of metal against metal issues and the more elaborate multiple piece buttons that can fall apart and cause other issues.  
that's the one i used...
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Re: Cam Button
[Re: fourgearsavoy]
#1597072
03/24/14 03:07 PM
03/24/14 03:07 PM
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Joined: Oct 2005
Posts: 8,874
Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,874
Ontario, Canada
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Quote:
I can see where the cam bolts were rubbing on the stock timing cover.
The first thing I'd be looking at is the length/thickness of the bolt head as that could be the issue. I've had allen head capscrews that hit the cover on install and had to use bolts with a thinner head. Just a thought before you assume the cam is walking.
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Re: Cam Button
[Re: Stanton]
#1597073
03/24/14 04:18 PM
03/24/14 04:18 PM
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Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
Quote:
I can see where the cam bolts were rubbing on the stock timing cover.
The first thing I'd be looking at is the length/thickness of the bolt head as that could be the issue. I've had allen head capscrews that hit the cover on install and had to use bolts with a thinner head. Just a thought before you assume the cam is walking.
We recommend always checking the cam bolts for clearence at the cover even if you use a button.We almost always find most need the heads trimmed down.
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