Camshaft
 

Should a the 50mm cam legal in stock. Jim Hanig

Re: Camshaft
 

I had a long talk with WL at Earlvile last year he wanted to check this at indy but was told no So until they start checking stockers it is a gray area. Yes there are a bunch of it out there. Tom

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I believe there's some very fast cars running them in stock. Bob

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Hi- I musta been gone or something but what is this 50mm deal about? I ran a stocker 10 years ago but am lost on this. Thanks in advance. Doug Schriener

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Al,
You said it all...

Re: Camshaft
 

The advantages of the 50mm cams are 1) larger base circle so the profile can have more detail, 2) cam companies have some body of experience/knowledge with these dimensions since Pro Stock and NASCAR have been doing this for decades, 3) roller bearings are readily available for this size. There are also some 65 mm cams running around in American auto racing arenas for very specialty applications.

Re: Camshaft
 

Save your Money!:cool: Spend it on Piston, Ring Combination!

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Damn it Woodro, stop handing out speed secrets. :eek:

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Hell, nobody believes me anyway!!!!!! lol:D

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I do, you just won't tell me enough.

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So are roller cam bearings legal.

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I doubt they look. They certainly are not worth what they cost to install and run.

A lot is made of the "big cams", a whole lot more than they are really worth, and there a lot of really fast cars that do not have one.

Yes, there probably is a little there, IF you have your valvetrain and your combination fully developed. But if you think it's even a tenth, you'll be terribly disappointed.

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This is way I ask these questions it sure saves a lot of money. I would like to know more about the the ring package though.

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I will tell you about the ring pack because i dont really care anymore.
The less you spend on the rings the faster you will go.
The key is the clearances and the surface prep, how about that.

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Wow, I can't think of but 2 instances that apply here -

1. You don't build any engines that compete in a competitive racing series.

or

2. You know someone who does, and they are lying to you.

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For a stocker or super stocer, yes. There are lots of places to spend money that has better returns.

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I personally say no. The 55mm (big block) cam is more expensive by a multiple of at least two, not to mention the machine work to able to run it. Then there is the question of strength in a production block (small bore bowtie blocks are hard to come by). The line has to be drawn somewhere, all other journals in the motor must be stock size, they should go ahead and mandate that the cam must be too. At least in stock.

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There's no spec for it, or the firing order, so do what you want.

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Well should the 50 mm be legal,or not, heard why they may help and what they cost is, but the real hitter,s arent going to worry about a 600 to 800 dollar cost stop them.A simple yes or no.??? Jim Hanig

Re: Camshaft
 

Jim, I think you want a poll, not an answer. If you want a poll, I think you can set one up on this forum to gather opinions.

If you want an answer, contact NHRA. I would suggest proper channels like your Div Tech person.

If Travis even started answering all of the questions in this snake pit NHRA would have a cow and Travis wouldn't get any sleep either.

It might take a considerable amount of time to get an answer from NHRA, but they are the ones that will give you one.

If you still have your superstocker, I think you can bore that out with no worries with rules.

P.S. I almost hate to say it, but as far as opinions go, I think Ed had the best one on this thread.

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The cost issue of going larger (50-55mm) is somewhat secondary to what the racer may be really after, and that is having a billet cam core. The reason racers go for a billet cam core is it is may be more compatible with the lifters he is running (Schubeck, tool steel or other non-OEM but allowable materials), and is less prone to flex or twist. This transition of course is a result of the extended RPM ranges you see in Stock.
So the thought is, if your going to run exotic lifters, might as well have a cam core that is more appropriate to the lifters. And if you run a larger core as Dwight Southerland stated, you receive the benefit of a better ramp. And if your going to do all of this, might as well straighten out the cam tunnel (which often frees up HP anyways), and then roller bearings as then you have less concern about wiping out babbitt bearings because you have a ton of spring pressure.
Is this for your average racer? No. But no doubt it's more common than you may think, especially in some of the faster and highly competitive ranks. Nobody said Stock was supposed to be a budget class. And if you are on a tight budget, there are still ways to be competitive and still enjoy racing.

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Ditto!

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What I was intrested in was the stock racer on the forms opinion. thats all. I aint worried if i can have one in my ss/stocker.
Jim Hanig

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Jim
I'm not shy, here's my opinion for what its worth.....
No the 50mm, 55, 65...what ever should NOT be legal in stock!!!
It would be nice to add competitors to our class, not drive them away, the added cost to me would far outway the performance gains....:cool:
Turkman