Bee Hive Shaped Valve Springs

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Oh my don't ya know Ms Peel has window shopped JMS hi rpm hi lift radiused lifters lightened low harmonic longer lasting less power draining valve train with bee hive race springs. I wonder if there is any practical way to access the drag of factory vs JMS valve train friction - w/o confusing power curve from the extra cam performance installed.
 
marksterrtt said:
Jim, what kind of pressures are you running with the street bottom washers? Mark
Click to expand...

I answered that in more detail somewhere on another thread.

Street bottom washers give you the same pressure as stock springs that are shimmed approx .065" from coil bind.

Race bottom washers give you the same pressure as RD race springs that are shimmed approx .065" from coil bind.

The reduced mass and inertia of the lightweight parts (by nearly 1/2) reduces wear on the valve train & cam lobes and protects you from valve float.
 
Besides the benefits of the beehive shape, the springs also use a wire that is oval in cross section, not the usual round shape. The rationale is that this design handles the stress in the wire more efficiently, as well as helping the heat dissipation in the spring. I seem to recall seeing conventional valve springs that used the same design, but that was many years ago, and I don't recall the manufacturer. It would seem like the oval wire would benefit conventional springs in the same way it does the beehive. Anyone know of current manufacturers who use this design in their conventional valve springs?

Ken
 
Thanks Ken for those links and thanks Jim, I'm not sure what stock Commando seat pressures are but I'll look up your referenced prior post...Mark
 
lcrken said:
Besides the benefits of the beehive shape, the springs also use a wire that is oval in cross section, not the usual round shape. The rationale is that this design handles the stress in the wire more efficiently, as well as helping the heat dissipation in the spring. I seem to recall seeing conventional valve springs that used the same design, but that was many years ago, and I don't recall the manufacturer. It would seem like the oval wire would benefit conventional springs in the same way it does the beehive. Anyone know of current manufacturers who use this design in their conventional valve springs?

Ken
Click to expand...

I don't know of any to fit a Norton but there are quite a few who supply ovate wire springs for cars. Lunati is one. I recently got a spring kit for a MB and it had ovate wire springs also but I don't know who made them. Jim
 
Jim
some of the very best valve springs made are from manufacturers NHK in Japan. They use their own specially formulated steels, and can produce beehive, progressively wound springs using ovate wire. Many of their springs can be identified by having a gap at the tang end of the end coil(s) , left so that shot peening can be done within this critical area, whereas most other spring manufacturers coils are close wound.
 
P&M use beehive springs on their Trident engines, sourced from a Ford Galaxy, I believe

Charles
 
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