I don't have the ability to move a single post, so here is 91parkave's reply.

I meant that it was an uncommon request, with the different lobe phasing and journals, in relation to a custom grind with normal phasing and journals. But, I suppose that's why they call it custom.



Thanks for keeping me on the straight and narrow. I got ahead of myself a bit, but I don't know how I mixed those up.



Ah. Thanks for the clarification.



Now thats cool. I saw a machine like that at a local parts store chain's machine shop (They do lots of machine work in house), but never got close enough to see how it worked.




I did not know this. Do you know why they do it this way? How is case hardening different from other forms of hardening?

Good thinking.

Found this one while I was figuring out what happened.


There may be an exception, but engine builders do not grind cams in house. Equipment is too expensive, and cams are too cheap.

That would include, ZZ Performance and Intense Racing.

Norm

Good catch.

Now that you have it, you can tell destineal that your reply to his unasked question, was worthless.


Only after you changed the subject.

Norm

Yes I do.


AKA surface hardening: A heat treat procedure that adds carbon to the iron at the surface of the material. In this case, it creates a hard surface from thirty to fifty thousandths deep. Makes the surface hard enough to resist wear, but retains the ductility of the iron.

Valve seats, for unleaded fuel, were done the same way. In both of these cases, the heat destroys the machined surface and a final grind is needed to make it serviceable.

Norm

his answer was given in the first reply, the author was looking for a performance oriented cam that is why he asked if there was a diffrence in the cams, i gave a resource, and then you added about that not being "economical" {FACT} Then the conversation shifted towards Which one is a lesser product and then you threw out local cam grinders , and this was the end result- Before blaming me for "off topic", "juvenile" and "smoke screen" comments you should examine your own doings first....

The game is called "find the quote, and post it". Here, I'll show you.

This is the meat of the previous conversation, in order.



















Notice how you are the one "directing" conversation. It is only because of your poor/off-topic posts that the rest of this crap ensues.

{FACT}- The reply was worthless, unless destineal had the desire to shell out twice the money required to get the cam he was looking for. You were told so in a professional manner. However, you just didn't get it.



{FACT}- You were the one that pushed the conversation there.
{FACT}- The only reason it was discussed is because you could not grasp the {FACT} that a cam doesn't have to be off the shelf to be available.



{FACT}- If I left in all the little childish insults that I edited from your posts when you posted them, we would all be laughing harder at this statement.

Those are a couple of hard posts to follow.

Following is how it looked before he edited it.


And the following is what he posted, after he edited it.


If his editing was not so obvious, it could have been an outstanding example of a sleazy smokescreen.

Instead, 91buickman shows us, again, the immature BS artist that he is.

There was a lot more, but the above two posts covered it far better than I did.

Norm

Thanks for the info Norm. I have studied some metallurgy, but not enough apparently. I assume the same is done for crankshafts?

I haven't.

Most of this stuff came from listening to Geezers (the above tidbit came from an old guy named Ed Iskenderian) while I was growing up. During my teens, I spent a lot of time talking to NHRA competitors at the local drag strips. I also learned a little when I worked in that little automotive machine shop.

Most importantly, I still listen to those Geezers, whenever they speak.


Not quite the same. Two similar methods are used on cranks, Tuftriding and Nitriding.

Both use chemicals, instead of carbon, and one uses more heat than the other. I leave the specifics to my crank grinder.

Cams must be hardened in all cases, but, depending on the power level, it's not necessarily needed with cranks.

I haven't reached that level yet.

Norm

Ed Iskenderian as in Isky cams? Thanks for sharing Norm- I would be listening to those Geezers too, if I had the luxury of having some around. There was one old guy that helped me with my first Olds, and he taught me a bunch. The little town I grew up in was nearly all Chebby/Ford when it came to "going fast", so most thought this old guy was nuts, but I listened to him, and it paid off.

I didn't realize you lived right in the thick of where a lot of the go-fast stuff came from, and I gotta say, I'm envious.




I read a book that was titled "metallurgy and welding" written in the 50's, when my first boss was teaching me how to torch weld. He said once I understood a bit about metal, that the welding would come easier. He was right. However, I don't recall anything about hardening other than quenching in water or oil.

Thanks for the crank info, but I have one more question. What do grinders use to polish the journals, after a crank has been cut?

Regards,
Andrew

The same.


Emery and/or crocus cloth on a hand held belt sander.



He's the same guy that does my crankshaft work.

Norm