Re: Cam walk?
[Re: AndyF]
#1771349
03/04/15 07:57 PM
03/04/15 07:57 PM
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Joined: Aug 2009
Posts: 1,317 Ohio
jlatessa
pro stock
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pro stock
Joined: Aug 2009
Posts: 1,317
Ohio
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Hope this is not seen as too dumb a question, but why are solid rollers prone to walk vs flat tappet??
And where is the button installed, front or back?
Anyone have some pics?
Thanks, Joe
OK, I looked up in the history and I saw the two reasons people think it does it; lobe taper, or lack of it, and gear thrust from the oil pump drive.
I can see the lack of lobe taper, but gear thrust is the same on all cams, no?
Does the skinny lobe width add a more important factor for restricting walk?
How does the button get installed??
Thanks again............
Last edited by jlatessa; 03/04/15 08:14 PM.
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Re: Cam walk?
[Re: jlatessa]
#1771357
03/05/15 12:17 AM
03/05/15 12:17 AM
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Joined: Oct 2005
Posts: 8,872 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,872
Ontario, Canada
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Quote:
Do/should you weld a thrust plate to the cover for better wear and rigidity or is that not a factor with all the oil up front?
Your preference on nylon or roller buttons?
If you're using the stock cover you need something to reduce the deflection. A plate welded on will work but make sure it clears the water pump.
I prefer a roller and I managed to find a roller button that fit. But I'm using a cast cover and a thick gasket. It took a lot of farting around to get the right combination. Its really personal preference, if the roller hadn't fit I wouldn't hesitate to use a nylon one.
To get "in the ballpark", I laid a straight edge across the top sprocket in the block and measured to the cover gasket face. I also measured to the bottom of the center hole and to the face of the sprocket. I then laid the straight edge across the timing cover and measured the depth where the button would be. I then used all those measurements to get an idea of the length of button I'd need. As it so happened the button was too long with a stock gasket so I used the thicker Superformance gasket and then had to slightly shim out the button.
Right about now Andy F. should be jumping in to promote the virtues of his billet timing covers !!
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Re: Cam walk?
[Re: AndyF]
#1771359
03/05/15 03:23 AM
03/05/15 03:23 AM
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Joined: Aug 2009
Posts: 1,317 Ohio
jlatessa
pro stock
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pro stock
Joined: Aug 2009
Posts: 1,317
Ohio
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Nice cover Andy, but a little steep for right now as I already have new std. stuff.
Stanton, I was thinking of welding the wear plate inside the timing cover, using an appropriately sized piece made up of a durable enough material.
Think I can make this work with say a nylon button??
Thanks guys, Joe
Last edited by jlatessa; 03/05/15 03:25 AM.
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Re: Cam walk?
[Re: jlatessa]
#1771362
03/05/15 02:07 PM
03/05/15 02:07 PM
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Joined: Oct 2005
Posts: 8,872 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,872
Ontario, Canada
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Quote:
Well I can tell you what happens when the rear cam plug is not installed all the way in.... The cam walks until the cam lobe wears,
Well that's really strange because the timing sprocket usually stops the cam from moving back!!
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Re: Cam walk?
[Re: Stanton]
#1771363
03/05/15 02:12 PM
03/05/15 02:12 PM
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Joined: Oct 2005
Posts: 8,872 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,872
Ontario, Canada
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Quote:
I was thinking of welding the wear plate inside the timing cover, using an appropriately sized piece made up of a durable enough material.
I'd weld it on the outside. I don't think there's enough room on the inside. The timing sprocket bolts will likely hit the plate.
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Re: Cam walk?
[Re: Stanton]
#1771365
03/05/15 10:43 PM
03/05/15 10:43 PM
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Joined: Feb 2005
Posts: 4,313 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,313
Prospect, PA
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Quote:
Quote:
Well I can tell you what happens when the rear cam plug is not installed all the way in.... The cam walks until the cam lobe wears,
Well that's really strange because the timing sprocket usually stops the cam from moving back!!
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