Roller cam button questions

[440beep]

I'm installing a roller cam in my motor and do I simply need a cam thrust button to hold the cam in place? what holds the button in place? Don't I also need a retaining plate for the button? Generally what I'm seeing is only the thrust buttons, but Mancini has a Cam Thrust Plate. What's the difference here? This Cam Thrust Plate seems like an obscure item since I can't find any RB ones on Jegs, Summit, Hughes, etc. Unless its called something else.

TIA!

 

[bigmanjbmopar]

Like this?

This is my roller cam button it snaps in place and is up against the timing cover. got mine at 440source.com

 

[67 coronet]

even if it dosnt snap in place,the cover holds it there.takes up the space between the cam and the cover so no walking is allowed.

 

[440beep]

Thanks. We were shying away from the roller bearing ones (fear of having pieces end up in oil pan) and looking for solid buttons. Going to try the Comp Cam one and if need be, we will machine our own aluminum one, as the Mopar engine book mentions.

 

[lewtot184]

i prefer the solid nylon ones. they don't wear out, easy to size, and besides; have you ever heard those metal torrington bearing buttons beating on a timing cover?

 

[440beep]

I've heard that issue also. But yea, we shall see how the Comp Cam nylon button sizes up.

i prefer the solid nylon ones. they don't wear out, easy to size, and besides; have you ever heard those metal torrington bearing buttons beating on a timing cover?

 

[khryslerkid]

I was wondering if someone could clarify why you use a "button". I've known about these for years and understand they prevent cam walk. Why dosent the factory use them or is it just more critical to use one on roller cam applications? TIA

 

[67 coronet]

most stock aplications will never see 4500 plus rpms for any period of time.therefore the chain works fine for holding the cam in place.in roller aplications the lifters are much more sensative to any cam movement and roller setups will pull power to much higher rpms.cam walk is much more prevalent at higher rpms.

 

[lewtot184]

I was wondering if someone could clarify why you use a "button". I've known about these for years and understand they prevent cam walk. Why dosent the factory use them or is it just more critical to use one on roller cam applications? TIA

a flat tappet cam has tapered lobes that hold it in place. rollers have flat lobes and the cam can wander in the block. the button controls foreward and aft movement that can damage the lobes and lifters and takes the side thrust off the chain.

 

[khryslerkid]

a flat tappet cam has tapered lobes that hold it in place. rollers have flat lobes and the cam can wander in the block. the button controls foreward and aft movement that can damage the lobes and lifters and takes the side thrust off the chain.

That makes perfect sense! I've noticed that wear pattern on used lifters.

Thanks guys, I never get tired of learning!

 

[snakeoil24]

Roller buttons or Bearings are used on Rollers only for one reason. Roller cams do not cut the lobes on a slant to help lifter rotation. Roller cams do not do this. The lobe plane is cut straight across, thus nothing to keep cam from walking forward.

 

[HEMI-ITIS]

I've heard that issue also. But yea, we shall see how the Comp Cam nylon button sizes up.

I like the white nylon one as well.Had a friend have that roller button come apart and wreak havic:black_eye:


Here is a nice timing cover if your going to buy one:blob1: http://arengineering.com/products/timing-chain-cover/

 

[440beep]

And you simply use the nylon button with the stock timing chain cover? And that holds it in place? The simplicity just doesn't make sense to me.

I like the white nylon one as well.Had a friend have that roller button come apart and wreak havic:black_eye:


Here is a nice timing cover if your going to buy one:blob1: http://arengineering.com/products/timing-chain-cover/

 

[lewtot184]

you have to use a 3 bolt cam gear and the button fits in the recess at the center of the cam gear. the nylon, alum, or roller type need to be fitted and the end play set, preferably with a dial indicator. the nylon button can be shortened at the small end to give the desired clearance between the cover and button. a little work but there forever.

 

[snakeoil24]

I like the sound of the nylon button better I think I will try this. Who do you guys get this from?

 

[440beep]

This is the one I just got.

http://www.summitracing.com/parts/cca-206/overview/make/dodge

I like the sound of the nylon button better I think I will try this. Who do you guys get this from?

And yes, my cam is a three bolt one. We will mess with it and get it fitted.

 

[HEMI-ITIS]

And you simply use the nylon button with the stock timing chain cover? And that holds it in place? The simplicity just doesn't make sense to me.

Not a stock cover,they will flex enough to cause problems.You need a reinforced cover like the one I posted.He makes them for other resellers like Mancini & Hughs.
I use the comp cams nylon button with the Milodon gear drive:blob1:

 

[440beep]

What about the reinforced Milodon covers with the 0.90 (or maybe its 0.090) metal plate inside the cover?

Not a stock cover,they will flex enough to cause problems.You need a reinforced cover like the one I posted.He makes them for other resellers like Mancini & Hughs.
I use the comp cams nylon button with the Milodon gear drive:blob1:

 

[HEMI-ITIS]

Sure,any reinforced cover.I just like the ones made here in the USA!:dink:

 

[440beep]

Thanks for the tip on needing the reinforced cover. I guess spending $350 on the proper cover is small insurance for a $5,000+- "built" motor.