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desiding on regrind or billet 

 

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 Post subject: desiding on regrind or billet
Posted: Wed May 11, 2011 10:36 pm 
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can anyone help me with this both regrind and billet would have the posi and negs could someone help me out?

 

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 Post subject: Re: desiding on regrind or billet
Posted: Wed May 11, 2011 10:58 pm 
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The negs to a billet is you can't get them at the moment.

The pos to a regrind is you can get them.

 

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 Post subject: Re: desiding on regrind or billet
Posted: Wed May 11, 2011 11:01 pm 
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lol?
how is that soo?

 

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 Post subject: Re: desiding on regrind or billet
Posted: Wed May 11, 2011 11:14 pm 
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performance wise? I would safely assume it will make s**t all difference. Billet is more expensive and currently unavailable as tickford_6 said. Regrind are cheap but need an extra set of shims in your rocker arms and are available.

 

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 Post subject: Re: desiding on regrind or billet
Posted: Thu May 12, 2011 12:10 am 
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I've heard some say billet will last longer cause regrinding effects the heat treatment of the camshaft but im suspect on how factual that is. Billet does make for an easy installation though :D
What cam you thinking of getting?
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 Post subject: Re: desiding on regrind or billet
Posted: Thu May 12, 2011 12:20 am 
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003106 wrote:
I've heard some say billet will last longer cause regrinding effects the heat treatment of the camshaft but im suspect on how factual that is. Billet does make for an easy installation though :D
What cam you thinking of getting?


...uhhh...not 100% sure here, but I am sure the lobes on the billets are grind/cut the same way as regrinding a stock cam...so not sure where this "heat treatment" thing is coming from.

 

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 Post subject: Re: desiding on regrind or billet
Posted: Thu May 12, 2011 7:56 am 
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People like Crow, Wade etc. simply wouldn't be doing it if there were issues.

I6 cams have huge lobes and the contact is thru rollers - quite massive ones at that - so I don't think there are any issues (quite apart from never having heard of any I6 cams "peeling").

 

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 Post subject: Re: desiding on regrind or billet
Posted: Thu May 12, 2011 8:52 am 
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IamSteve wrote:
lol?
how is that soo?



because we are not dealing with a small block chev with massive after market support.
We are dealing with a local one country engine with a small demand one billet cams, So it make no sence for manufacturers to make them.

Even when you could get them, most people bought cheap regrinds anyway. So demand was even less.

 

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 Post subject: Re: desiding on regrind or billet
Posted: Thu May 12, 2011 12:34 pm 
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A cam is case hardened.
I have personally seen the case hardening give away on a reground cam for a clevo.
Whether it was just a bad one , wasnt installed and run in correctly , or if they all let go I cannot say.
When ever I am getting a cam I just get a new one. But playing with V8's I have that luxury.

 

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 Post subject: Re: desiding on regrind or billet
Posted: Thu May 12, 2011 12:53 pm 
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I thought it sounded a bit suspect seeing as the new billet camshafts would be getting ground to shape anyway. Just thought I'd let you know what I was told.
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 Post subject: Re: desiding on regrind or billet
Posted: Thu May 12, 2011 12:55 pm 
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theres a billet crow cam on ebay rite now for a falcon, second hand,so crow cams must do billet, either that or the blokes not telling the truth

 

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 Post subject: Re: desiding on regrind or billet
Posted: Thu May 12, 2011 1:55 pm 
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bry40l wrote:
theres a billet crow cam on ebay rite now for a falcon, second hand,so crow cams must do billet, either that or the blokes not telling the truth


They used to, but from what I have read and been told, camshaft companies are finding it hard to find billet metal/cams to grind. Second hand could be genuine...

 

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 Post subject: Re: desiding on regrind or billet
Posted: Thu May 12, 2011 2:25 pm 
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crow cams are still selling billet cams, but they may have there own supply or a large amount of stock..
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 Post subject: Re: desiding on regrind or billet
Posted: Thu May 12, 2011 4:48 pm 
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Also price of brand new billet compared to regrind is a factor. I was quoted about $500 for a new crow unit as opposed to about $200 for a reground wade. Again, these prices are a guide, I would recommend calling up the respective companies to confirm prices.

 

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 Post subject: Re: desiding on regrind or billet
Posted: Sun May 15, 2011 9:31 am 
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Functionally I can confirm - after having a JMM regrind in my ED for 10 years - that regrinds work fine and won't cause issues unless there are other dramas like poor oil supply to the top end and/or sick lifters.

This JMM cam has run that whole time with 2x1.9mm factory shims + 1x1mm stainless washer in each lifter - ie. 2.9mm extra shimming on top of the original single factory shim.

The only drama I've has is that when I transferred the cam + whole rocker assembly into my EF, it tended to click a bit pretty much every time it was started cold and occasionally when it was warm too. It ran fine tho.

When I did the head gasket on the EF a few weeks ago I found the washers were wearing slightly (they were off the shelf stainless, not hardened). Remember. that's after being in the ED for 10 years and the EF for another 18 months or so...

So I cleaned out the lifters and put it all back together with proper hardened shims from Precision Shims Australia and it's sweet.

- V8 cams have much smaller lobes - ie. tighter shape - so straight up they're under more surface load - and unless running roller type lifters they're in direct sliding contact (oil lubricated of course) with the followers/lifters. Pretty much a very different deal than I6 cams.

 

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