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 13Likes
07-01-2014, 11:46 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Quote:
Originally Posted by philminotti
Good grief, Brent. My cam is 248/252, .633 lift and I have little vacuum and a VERY lopey idle. That cam redefines radical street cam, IMO.
phil
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Phil, for a 482, 248 at .050" is a pretty mild cam. I use similar grinds in my 482 stuff and they have a nice lope but also have good vacuum.
The cam for this one is a hoss-cat, but it needs to be to put the hp peak where we want it. |
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07-01-2014, 12:00 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,591
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Not Ranked
Quote:
Originally Posted by blykins
Phil, for a 482, 248 at .050" is a pretty mild cam. I use similar grinds in my 482 stuff and they have a nice lope but also have good vacuum.
The cam for this one is a hoss-cat, but it needs to be to put the hp peak where we want it.
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My cam is very much like Phil's (245/252, .631/.650 lift), popular middle of the road cam for a 482. I've always maintained that it's just about perfect for me, but I've always thought maybe just a touch more would have been even better.
The cam chosen for this 496 project should be nearing the radical side of the scale with almost .800 lift. What is the intended use of this engine and Cobra? |
07-01-2014, 12:07 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Quote:
Originally Posted by RodKnock
My cam is very much like Phil's (245/252, .631/.650 lift), popular middle of the road cam for a 482. I've always maintained that it's just about perfect for me, but I've always thought maybe just a touch more would have been even better.
The cam chosen for this 496 project should be nearing the radical side of the scale with almost .800 lift. What is the intended use of this engine and Cobra?
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Heads help a lot, Rod. A higher flowing head makes it easier for the cam to work. So if you have an existing setup, then add head flow (better flow/velocity), the engine will generally peak a little higher. May be an option for you down the road.
Your cam and Phil's cams are pretty moderate, I use those specs quite a bit for hydraulic roller 482's with CNC'd Edelbrock heads, and they generally give a 5500-6000 rpm hp peak. Should be very streetable. I did a 487 with basically stock performing Edelbrocks, used a 244/248 @ .050" cam with .620-ish lift on a 112 LSA, and the customer was very happy....had more than enough vacuum to run power brakes, etc.
The cam for this engine is .775" gross lift. You lose about .020" of that to lash, so you end up at about .750" net lift, which will work well with the cylinder heads.
The engine is going in a Cobra designed for weekend fun. Customer is very well acquainted with higher revving, higher horsepower engines, and he wanted to up the ante over his existing mill.
Last edited by blykins; 07-01-2014 at 01:09 PM..
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07-17-2014, 05:01 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Keith has almost finished up the heads. I don't have a dog in the cylinder head fight, so I get to use anything and everything...LOL
Keith has done a good job with taking a set of Stage 2 Edelbrocks and upgrading them to Stage 3. I shipped him a set of custom Ferrea 5/16" valves and he changed the guides, did the valve job, and did the port work.
Check these numbers out, especially mid lift numbers:
Intake:
.300 - 225
.400 - 281
.500 - 331
.600 - 352
.700 - 361
On the exhaust side, he's getting 264 @ .700".
This was on a 4.250" fixture, on his SF 1020 bench.
These heads flow 30 more cfm at .400" lift than an out of the box Edelbrock flows at .600-.650". 
He's getting me numbers for .750-.800 lift and I will pass that on when I get it. |
07-18-2014, 05:09 AM
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CC Member
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Join Date: Apr 2006
Location: Charlottesville,
va
Cobra Make, Engine: Coombe, Shelby Block 496
Posts: 1,187
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Not Ranked
Pictures, Pictures please, this one should sound sweet!
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07-21-2014, 06:05 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Diamond pistons came today....
Only 518g, very light for a 4.310" bore.
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07-21-2014, 08:00 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Do they come with DFL on the skirts or did you send out?
__________________
Chas.
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07-22-2014, 03:46 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
It's an option that diamond provides.
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07-22-2014, 05:13 AM
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CC Member
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Join Date: Apr 2006
Location: Charlottesville,
va
Cobra Make, Engine: Coombe, Shelby Block 496
Posts: 1,187
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Not Ranked
Nice, I need a set of those for my Shelby block.
What's the guess on HP with this one?
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07-22-2014, 05:15 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Up towards 700...
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07-22-2014, 12:27 PM
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CC Member
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Join Date: Apr 2008
Location: Melbourne,
Vic
Cobra Make, Engine: Some polish thing... With some old engine
Posts: 2,286
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Not Ranked
Quote:
Originally Posted by blykins
Up towards 700...
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You can't foresee a problem with that?
Identity crisis perhaps? |
07-22-2014, 12:28 PM
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CC Member
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Join Date: Apr 2006
Location: Charlottesville,
va
Cobra Make, Engine: Coombe, Shelby Block 496
Posts: 1,187
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Not Ranked
Wow, that's just crazy!
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07-22-2014, 12:29 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
I just build 'em.  |
07-22-2014, 04:33 PM
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Senior Club Cobra Member
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Join Date: Feb 2005
Posts: 651
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Not Ranked
Quote:
Originally Posted by Dimis
You can't foresee a problem with that?
Identity crisis perhaps? |
Did someone hand off the psychological profiler baton to you? |
07-22-2014, 05:05 PM
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Full Blown Member
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Join Date: Sep 2008
Cobra Make, Engine: KMP 427 S/C, Twin Paxton 511 FE
Posts: 2,594
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Neutral
601HP,
Your build? I noticed in your profile it says, 'No engine for a while'.
That's gonna be a sweet motor.
__________________
rodneym
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07-22-2014, 05:20 PM
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Senior Club Cobra Member
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Join Date: Feb 2005
Posts: 651
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Not Ranked
Quote:
Originally Posted by rodneym
601HP,
Your build? I noticed in your profile it says, 'No engine for a while'.
That's gonna be a sweet motor.
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I do have a horse in this race, as many as Brent can fabricate.
David |
07-22-2014, 05:26 PM
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Full Blown Member
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Join Date: Sep 2008
Cobra Make, Engine: KMP 427 S/C, Twin Paxton 511 FE
Posts: 2,594
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Not Ranked
Nice!
Shame we never got the mags going, huh?
Would've looked great with your paint scheme.
__________________
rodneym
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07-22-2014, 05:44 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
I knew you couldn't stay anonymous for long....
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07-22-2014, 05:56 PM
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Senior Club Cobra Member
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Join Date: Feb 2005
Posts: 651
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Not Ranked
Quote:
Originally Posted by blykins
I knew you couldn't stay anonymous for long....
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Well...... I planned for it to be your prime-time show during the build of the engine. After the build, it would become my show. However, I allowed a flippant left-field comment from Oz-land to irritate me.
So Brent, it's still your show! Go make some horsepower. 
David |
07-22-2014, 05:59 PM
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Senior Club Cobra Member
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Join Date: Feb 2005
Posts: 651
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Quote:
Originally Posted by rodneym
Nice!
Shame we never got the mags going, huh?
Would've looked great with your paint scheme.
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Rodney,
I'm half there with the wheels. I copped a pair of still in the box NOS Halibrands, circa 1980's casting, a few months ago. They're fronts. I'm still trolling for rears.
David |
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