Head Button
- Thread starter Kim J
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Marty Davis
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I have made MANY head buttons and I firmly believe that 7075 is by far the best.
Marty Davis
Jack ODonnell
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4032 It will not out grow the sleeve.
Marty Davis
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Considering who made this post, I will sure try 4032. Found it at McMaster.com
Jack:
Interested in hearing what you know about this alloy for head buttons.
I had a lot of detonation with other alloys until I used 7075. How is 4032 for detonation. Also, how much clearance do you prefer between button and sleeve for a .21? I like a snap fit - no press at all, but tight snap.
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Jack ODonnell
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Marty; Check out the expansion rate for the different alum.and compare to 360 or 464 brass and you will see the difference. Snap fit is ok,no problem with detonation. J.ODonnell
Marty Davis
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EXPANSION!!! Now there is something to look at. 
If a head button expanded enough could we loose p/l fit? AND I am assuming the button will "bounce back" to its original state...but will the sleeve-p/l fit contract also. There is not much we can do about the sleeve material without a major project involving a lot of machining, but we can look at button material. Very interesting revelation.
Norm Doerr
If a head button expanded enough could we loose p/l fit? AND I am assuming the button will "bounce back" to its original state...but will the sleeve-p/l fit contract also. There is not much we can do about the sleeve material without a major project involving a lot of machining, but we can look at button material. Very interesting revelation.Norm Doerr
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Mark;
I agree with you on that. There are a bunch of things involved. Piston, sleeve, head button etc. Obviously we need those to all work together I can tell you from personal experience the the water jacket is a big deal Or lack of a water jacket in some cases. I have seen a LOT of engines that are "overcooled" .
I agree with you on that. There are a bunch of things involved. Piston, sleeve, head button etc. Obviously we need those to all work together I can tell you from personal experience the the water jacket is a big deal
Or lack of a water jacket in some cases. I have seen a LOT of engines that are "overcooled" .
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Jack ODonnell
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What does plug depth and bowl shape have to do with head material ??Norm and Others,
I think you want the whole assembly to expand aprox. at the same rate.
There are a few other things to consider such as: depth of glow
plug in the combustion chamber and bowl shape. There are some new
depths and bowl shapes that work better than what some are using
currently. The pipe design really helps this new combination.
Custom pipes are the way to go. Also, water jacket design is
critical for the correct heat in the motor. The button material is
only part of the combustion equation.
Have Fun Testing Everybody,
Mark Sholund
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I was thinking the same thing...lol.. good one Jack!
Grim
Grim
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