Let me help you out. I realize you are nothing but a troll but it’s all you can do.
My first post in this thread asked what’s better about the beehive spring. The correct answer is nothing. Except they are cheaper to produce and cost is a big deal to the OE’s. That’s exactly why they use them.
Then you come along and say they they can use LESS pressure (only if you love broken parts).
Your next claim is they have less surge than a conventional spring. Maybe. And that’s a weak maybe. Surge is caused by many things and the shape of the wire has a minimal impact on it. As an example, if you are fighting a surge issue the biggest chance is you aren’t close enough to coil bind. Shim the spring closer to coil bind and it stops it.
Next up you claim they don’t need a damper, yet now they make a dual conical spring. The inner spring does add some pressure, but it’s there mostly to control harmonics. I’ve seen serious damage done buy buying a triple spring (an actual triple, not two coil springs and a thin damper) and then pulling the inner out to save 20-30 pounds of installed pressure. You could see the valve train go in and out of control on the dyno. You could see the lobes taking a beating. The valve stems got the snot beat out of them. Even the retainers were showing signs of stress. We put the inners back in and it all cleaned up.
Once again, the question is what does the beehive do that a conventional spring won’t do? Answer: nothing. They won’t extend the rpm range. They won’t control the valve train with less pressure. They may (if you have some other issue) clean up some harmonics problems, but that can be attributed to the different resonance frequency of the beehive over the conventional spring. In that case, a change to ANY spring may have helped. Or a change in retainer weight.
The blanket statement that beehives are better is just nonsense. Did I not insult your highness with this post? You invite insults. You get exactly what you deserve.
Better harmonics from what I've read. I'm not against using the dual I was wondering if the beehive would be better that's all. Just want to make sure. I would think if trick flow offers a cam with the heads package it would be ok
All things have a resonante frequency. Building oilfield compressors, occassionally they would have a contractor come and check the piping and vessel.resonant frequencies to make sure they were not multiples of the running RPM. The two together can excite one another, and cause vibration in the piping leading to eventual failure. This was on piping of 2" to 24" diameters.
Valve springs have a resonant frequency. If you are running the engine at a multiple of that frequency, the spring can start to surge. You could use a plexiglass valve cover and a timing light with the retart dial to watch the valve spring. When it starts to surge, there is like a wave that travels up and down the spring between the individual coils. There are youtube videos available to watch.
Beehive springs have and advantage there in that the different diameters hae different resonant frequencies, which resists the surge. Pretty much all the factories are using all the means available to reduce vehicle weight and materials used. The new Mopar Hemi valve stems are 5/16, which is only a few thousandths smaller than the Chevy LS at 8mm. Ford and import multivalve are even smaller. This also reduces valve weight for higher RPM. The smaller and lighter retainers and keepers also aid this.
I am putting LS 5.3 valves, I 1.9", E 1.55" in my Ford 289 heads to aid airflow. The HFT cam was on the way out and the knurled guides getting loose. Bronze 5/6 guides will be installed and honed to fit the 8mm valve stems. New exhaust seats for unleaded to fit the +0.100 valves. Add in a bit of bowl and port work for snappy street performance. I relate this Ford info just for an idea for you guys. Just check valve lengths.
My one problem was finding the valve springs. 1966 to 68 289 heads had spring installed height of 1.64". Too short for the LS springs 1.8". TFS sells a PAC beehive with the required spring rates and 1.6" installed height.
There is another spring option that is reportedly better, but of course more expensive. These are conical. The beehive springs diameter changes slowly at first but the last couple of coils change rapidly at the top. Conical springs vary from the bottom to the top, evenly.A straight edge held against the side will touch every coil.
Very aggressive cams require springs that may be beyond what a beehive or conical.can deliver. When you make a spring stiffer, the wire diameter needs to increase, which can lead to failure. This is where double and triple springs come into play. Each spring can be a bit less stiff, but the total is much stiffer. They are also wound in opposite directions to combat surge. Now these springs are heavier, so require a bit more spring rate to offset their own inertia.
