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Lifters [Tappets] and MSX Head
- Thread starter iceben
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D
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[ QUOTE ]
even an ounce or two
[/ QUOTE ]
The V term gets squared here...
But we can't do anything about that one.
(In fact the whole point is to make it worse)
Ever heard of the getting killed by a box of kleenex sitting on the back shelf, urban legend?
even an ounce or two
[/ QUOTE ]
The V term gets squared here...
But we can't do anything about that one.
(In fact the whole point is to make it worse)
Ever heard of the getting killed by a box of kleenex sitting on the back shelf, urban legend?
D
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Never understood that one.....
How do you reach the box from up front?
And......It's like saying......
"I've got sick people riding w/ me.......So STAY BACK"
iceben.......You have probably seen this MSX modification place right? https://www.flowspeed.com/rates.htm
How do you reach the box from up front?
And......It's like saying......
"I've got sick people riding w/ me.......So STAY BACK"
iceben.......You have probably seen this MSX modification place right? https://www.flowspeed.com/rates.htm
Nunyas
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[ QUOTE ]
I have heard that the lightest roller rockers are within 5 grams of standard ones.
The biggest difference then becomes where the weight is distributed.
Rollers have a much higher moment of inertia on account of having most of their mass toward the outer edge.
While all rockers describe an arc......The arc is so small that a properly faced one probably has little effect on ratio. IMNSHO
So far as side load goes.........Is this really significant?.....I'm thinking not.
The question then becomes.... How or where can I have my rockers "blueprinted"
So far as tappets having to move further on "bumpier" cams argument goes.
(Where someone claims it requires more force to move them further)
F=MV Squared would seem to suggest that the opposite is true
[/ QUOTE ]
F=MV^2 ... but V=Distance / Time with direction... So distance does matter and is part of the equation, unless V in the equation is not "Velocity". But given the distance we're moving tappets, rods, and rocker arms the force used to do this is relatively negligible when compared to the force needed to over come the force of the valve springs in use.
you *almost* have me wanting to figure out the amount of energy wasted in an engine due to internal friction and opposing forces... **almost** /ubbthreads/images/graemlins/smirk.gif
I have heard that the lightest roller rockers are within 5 grams of standard ones.
The biggest difference then becomes where the weight is distributed.
Rollers have a much higher moment of inertia on account of having most of their mass toward the outer edge.
While all rockers describe an arc......The arc is so small that a properly faced one probably has little effect on ratio. IMNSHO
So far as side load goes.........Is this really significant?.....I'm thinking not.
The question then becomes.... How or where can I have my rockers "blueprinted"
So far as tappets having to move further on "bumpier" cams argument goes.
(Where someone claims it requires more force to move them further)
F=MV Squared would seem to suggest that the opposite is true
[/ QUOTE ]
F=MV^2 ... but V=Distance / Time with direction... So distance does matter and is part of the equation, unless V in the equation is not "Velocity". But given the distance we're moving tappets, rods, and rocker arms the force used to do this is relatively negligible when compared to the force needed to over come the force of the valve springs in use.
you *almost* have me wanting to figure out the amount of energy wasted in an engine due to internal friction and opposing forces... **almost** /ubbthreads/images/graemlins/smirk.gif
D
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[ QUOTE ]
So distance does matter and is part of the equation,
[/ QUOTE ]
So what do you think?....
Smaller lift cam & higher ratio rockers or high lift cam and standard rockers.
/ubbthreads/images/graemlins/devilgrin.gif
(ready for another "quick carb fix"?) /ubbthreads/images/graemlins/grin.gif
So distance does matter and is part of the equation,
[/ QUOTE ]
So what do you think?....
Smaller lift cam & higher ratio rockers or high lift cam and standard rockers.
/ubbthreads/images/graemlins/devilgrin.gif
(ready for another "quick carb fix"?) /ubbthreads/images/graemlins/grin.gif
Hap Waldrop
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Tony, this weight thing is making you lose your mind, that's not what you buy roller rockers for /ubbthreads/images/graemlins/smile.gif Here's my advice on roller rockers, first off forget Harland Sharp, in anything but 1.5 with the stock pedestals and even then I like to see a custom bushing made that locates the shaft pivot point in the proper location for the ratio, any higher ratios and you need to look at custom made pedestals. Keep in mind what you get for the money with Harland Sharp roller rockers for the price is 8 bare roller rockers, thats it, you need new adjusting nuts (HS does not supply adjusting nuts) proper pedestals, a hardened shaft and solid spacers. When you add it all up what you have is a very minor savings over a set of Titans which comes with everything except the solid spacers, so in my opinon, unless you can design pedestals and make them, money and time wise, just get the Titans and be done with it. We made custom A-series pedestals for the HS 1.5 rollers a few years back, they were $150.00 a set, you can see it doesn't take long before the Titans become justified at the higher price, because you getting alot more for your money.
Nunyas
Yoda
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[ QUOTE ]
[ QUOTE ]
So distance does matter and is part of the equation,
[/ QUOTE ]
So what do you think?....
Smaller lift cam & higher ratio rockers or high lift cam and standard rockers.
/ubbthreads/images/graemlins/devilgrin.gif
(ready for another "quick carb fix"?) /ubbthreads/images/graemlins/grin.gif
[/ QUOTE ]
high lift cam w/ standard rockers. the lower ratio rockers would exert less opposing force during lift for any given spring. /ubbthreads/images/graemlins/smirk.gif
Then again, I'm far from being a expert in this area of engine technology, or on engines period for that matter. heh
On my car, I've considered changing cams, but using "high ratio" rockers are appealing in their own right. The biggest advantage I can see for using "high ratio" rockers is that rockers appear to be easier to change out than the cam on the 'B engine. Remove the valve cover and replace the rocker assy. Changing the cam seems a bit more involved just to get to a point where you can easily access the cam with the engine still in the car.
[ QUOTE ]
So distance does matter and is part of the equation,
[/ QUOTE ]
So what do you think?....
Smaller lift cam & higher ratio rockers or high lift cam and standard rockers.
/ubbthreads/images/graemlins/devilgrin.gif
(ready for another "quick carb fix"?) /ubbthreads/images/graemlins/grin.gif
[/ QUOTE ]
high lift cam w/ standard rockers. the lower ratio rockers would exert less opposing force during lift for any given spring. /ubbthreads/images/graemlins/smirk.gif
Then again, I'm far from being a expert in this area of engine technology, or on engines period for that matter. heh
On my car, I've considered changing cams, but using "high ratio" rockers are appealing in their own right. The biggest advantage I can see for using "high ratio" rockers is that rockers appear to be easier to change out than the cam on the 'B engine. Remove the valve cover and replace the rocker assy. Changing the cam seems a bit more involved just to get to a point where you can easily access the cam with the engine still in the car.
Hap Waldrop
Yoda
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I corrected my above post, to say Titan roller rocker arm assemblies come with everything except solid spacers.