Solid Roller Cam ??

[blykins]

Originally Posted by bobcowan

Thatis counter-intuitive. And exactly the opposite of what I was thinking. That makes the cam "smaller" as the engine warms up. Since that's the case, why not set lash near zero when cold, knowing that it will grow as the engine heats up?

Why not? I was cruising through the Lunati web site, and they have beehive springs specifically for the solid roller cams; 425# open pressure.

Everything I'v read about the beehives say that they're the next step in spring technology. But not many racers are willing to step up and give them a try. If they're all they say they are, seems like that would be some easy power.

That's right....the effective duration of the cam gets smaller as the engine heats up.

The reason you don't set it near zero is because it only grows so much. In the case of iron block/aluminum heads, you get around .006" growth. If you set cold lash to near zero, then you'd only have a little lash when hot. Due to the lobe design, camshafts are designed with lash in mind. That's why your cam card for your solid cam will give you hot lash specs. Most are in the .016-.022 range. Some a little more, some a little less.

I wouldn't trust a beehive in a solid roller application. You have a small single spring there, taking the brunt of everything. If that single spring fails, then you've dropped a valve.

There's been some OEM LS beehive spring issues in the past. No trust here.