Re: Roller rocker spacing?
[Re: EvilScamp]
#1586725
03/01/14 11:34 PM
03/01/14 11:34 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I'd wanna get down to .015" now/with good side to side alignment on the shaft. Somebody has em
live every 24 hour block of time like it's your last day on earth
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Re: Roller rocker spacing?
[Re: Cab_Burge]
#1586729
03/02/14 01:56 AM
03/02/14 01:56 AM
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Joined: Jan 2003
Posts: 5,445 So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,445
So Cal
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As Cab said, getting the proper alignment of the roller tip to the valve stem is the challenge... To accomplish this we do the following: 1. Use a spare head for as a mockup sample 2. Use a Dremel tool/sanding drum to modify the valve shim for the proper clearance.. For example, if U need a shim of 0.012, take a 0.015 shim and sand it down slightly 3. After setting the rockers and shims up, mount the shaft on the mockup head. Torque down the shaft, now recheck the rocker clearances they can change slightly. This procedure allows one to optimize the rocker setup easily, and then transfers the total shaft/rockers/shims for final engine mounting. Just my $0.05...
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Re: Roller rocker spacing?
[Re: EvilScamp]
#1586733
03/03/14 06:07 PM
03/03/14 06:07 PM
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Joined: Jan 2003
Posts: 75,070 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,070
U.S.S.A.
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Quote:
I'm using .015 now, does anyone make any thinner shims? Neither Summit or Jeg's carry them.
Check Mancini and or Hughes for the shims . Springs are ok on ductile rockers ... well for some maybe ... I wouldn't use them on alum. body rockers if that's what you have. If you go with springs you'll want to put a shim between it and the rocker body and you still need to shim it to center the roller tip over the spring , you can't use a spring between the rocker and the stand .
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Re: Roller rocker spacing?
[Re: JohnRR]
#1586734
03/03/14 07:32 PM
03/03/14 07:32 PM
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Joined: Oct 2005
Posts: 8,884 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,884
Ontario, Canada
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Quote:
Springs are ok on ductile rockers ... well for some maybe ...
No problem on ANY ductile rocker. But you still want a shim an either side of the rocker to prevent wear from both the spring and the stand.
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I wouldn't use them on alum. body rockers if that's what you have.
Why not, aluminum or iron - makes no difference. Shim between the spring and rocker to prevent wear.
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If you go with springs you'll want to put a shim between it and the rocker body and you still need to shim it to center the roller tip over the spring
Absolutely.
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you can't use a spring between the rocker and the stand
Really, did this need to be stated ?!?!?!?
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Re: Roller rocker spacing?
[Re: Stanton]
#1586735
03/03/14 11:58 PM
03/03/14 11:58 PM
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Joined: Jan 2003
Posts: 75,070 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,070
U.S.S.A.
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Quote:
Really, did this need to be stated ?!?!?!?
Obviously it did because you found the need to completely dissect my post ...
the thick heavy springs cause friction side loading against the rockers and the light springs could allow the rockers to shift sideways when opening the valve.
The spring is a crutch for people too lazy to use spacers ...
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Re: Roller rocker spacing?
[Re: JohnRR]
#1586736
03/04/14 12:25 AM
03/04/14 12:25 AM
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Joined: Oct 2005
Posts: 8,884 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,884
Ontario, Canada
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Quote:
The spring is a crutch for people too lazy to use spacers ...
Hmmm, tell that to Tom Hoover !!!
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Re: Roller rocker spacing?
[Re: Sinitro]
#1586740
03/04/14 04:36 PM
03/04/14 04:36 PM
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Joined: Aug 2003
Posts: 43,237 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,237
Bend,OR USA
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Quote:
As Cab said, getting the proper alignment of the roller tip to the valve stem is the challenge... To accomplish this we do the following:
1. Use a spare head for as a mockup sample 2. Use a Dremel tool/sanding drum to modify the valve shim for the proper clearance.. For example, if U need a shim of 0.012, take a 0.015 shim and sand it down slightly 3. After setting the rockers and shims up, mount the shaft on the mockup head. Torque down the shaft, now recheck the rocker clearances they can change slightly.
This procedure allows one to optimize the rocker setup easily, and then transfers the total shaft/rockers/shims for final engine mounting.
Just my $0.05...
No disrespect intentded, I wouldn't swap rocker assemblys from side to side once their set up, let alone set them up on another head and then expect them to be correct for a head that may be a different brand or casting number OP, my message is to set up the rockers for the heads your going to run and mark the assembly in a way you know which rockers go on which head Setting them up can be very challenging, I start with the two inner cylinders and then do one outer at a time, not much fun anyway you do it but it does help make the motor more efficient and the parts will last longer when done properly I need to clarify once you get the roller tip so it is in full contact with the valve stem moving it so it is centered is not a gain in performance or longivity, it just looks better In other words if you can't get it centered on any or all of them don'tworry about it, as long as the roller tip is in full contact
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Roller rocker spacing?
[Re: Cab_Burge]
#1586742
03/04/14 09:56 PM
03/04/14 09:56 PM
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Joined: Jan 2003
Posts: 5,445 So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,445
So Cal
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Quote:
Quote:
As Cab said, getting the proper alignment of the roller tip to the valve stem is the challenge... To accomplish this we do the following:
1. Use a spare head for as a mockup sample 2. Use a Dremel tool/sanding drum to modify the valve shim for the proper clearance.. For example, if U need a shim of 0.012, take a 0.015 shim and sand it down slightly 3. After setting the rockers and shims up, mount the shaft on the mockup head. Torque down the shaft, now recheck the rocker clearances they can change slightly.
This procedure allows one to optimize the rocker setup easily, and then transfers the total shaft/rockers/shims for final engine mounting.
Just my $0.05...
No disrespect intentded, I wouldn't swap rocker assemblys from side to side once their set up, let alone set them up on another head and then expect them to be correct for a head that may be a different brand or casting number OP, my message is to set up the rockers for the heads your going to run and mark the assembly in a way you know which rockers go on which head Setting them up can be very challenging, I start with the two inner cylinders and then do one outer at a time, not much fun anyway you do it but it does help make the motor more efficient and the parts will last longer when done properly I need to clarify once you get the roller tip so it is in full contact with the valve stem moving it so it is centered is not a gain in performance or longivity, it just looks better In other words if you can't get it centered on any or all of them don'tworry about it, as long as the roller tip is in full contact
Cab.. The advantage of setting it up on a mockup head is to get in the ball park.. Since there are variable tolerances between heads, once the shaft/rockers are switched to the final head to be mounted and torqued down. A final tweek of a shim may be required to optimize centering the roller to the valve stem and/or to have adequate tolerance between rockers but 95% of the critical work is done..
If a tweek may be required, EZ to pull off the shaft/rockers and adjust as needed. A few times we have had some minor differences between the heads for clearances, after torqueing down the shaft..
Just my $0.05...
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