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02-28-2006, 05:24 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
How will it sound?
Since I changed from a flat tappet cam to a solid roller, I'm curious as to how my engine will sound with the new cam....
It's a custom grind solid roller from KC. 248/254 duration, .675/.682 lift with a 110 LSA.
I'm dying to start on this build, but my block is still being machined. So now I just have to sit and use my imagination. 
Just curious as to what this thing will sound like when it's idling....thumpy? Rough? |
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02-28-2006, 08:12 AM
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CC Member
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Join Date: Nov 2004
Location: Grand Rapids,
Mi
Cobra Make, Engine: Hurricane 427S/C, KC/Pond aluminum 427/482 SO, TKO 600
Posts: 597
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Not Ranked
I've been sitting with my imagination for over a year since receiving my KC FE motor. I went with a hydro roller set up for the maintenance factor, so I'm not expecting as much of a lump as what I think you're going to end up with, with the 110 LSA and solid rollers.
Maybe this will help;
http://www.classicchambered.com/soun...ar_Idle_PS.mp3 |
02-28-2006, 08:27 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
Burgs,
Any idea on what cam's in that engine?
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02-28-2006, 08:34 AM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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Not Ranked
Brent,
I am running a 607 lift solid lifter cam w/ similar duration but my seperation is only 108. Idle is rough and I usually have my idle set at about 1000 RPM's and at idle I am running pretty rich but the fuel mix is just about right for wot.
Good luck with your run in.
Clois
__________________
Sunshine, Asphalt and no stop signs...Perfect
"Let's roll"
"Be part of Something Good
......Leave Something Good Behind!"
from CD "Long Road Out of Eden"
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02-28-2006, 08:39 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
Clois, I ditched the flat tappet cam and went with a solid roller.
With the same durations, I think a solid roller would be a little milder compared to a solid flat tappet cam....
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02-28-2006, 11:11 AM
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CC Member
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Join Date: Nov 2004
Location: Grand Rapids,
Mi
Cobra Make, Engine: Hurricane 427S/C, KC/Pond aluminum 427/482 SO, TKO 600
Posts: 597
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Not Ranked
Brent,
I just pulled that off the website that had a "Cobra Kit" sound file. As far as I know, it could be anything, so it's not really an answer to your question. I just thought it might keep you entertained until you fire yours up.  http://www.classicchambered.com
I think the Cobra belongs to these folks;
Kinetic Racing Engines, 38664 Webb Dr., Westland, MI. 48185.
(734) 595-7593. Contact: Chris Gesek.
Engine builders, Cobra Kit Car builders, distributor.
Brad
Last edited by Burgs; 02-28-2006 at 11:15 AM..
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02-28-2006, 11:49 AM
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CC Member
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Join Date: Jan 2002
Location: Northridge,
CA
Cobra Make, Engine: Arntz Cobra
Posts: 1,838
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Not Ranked
Bykins,
Unless you changed the compression ratio, there should be little difference in the sound. With a longer duration cam, the car may rock a little more while sitting at a traffic light, though! That's a good thing, NOBODY wants to race you.
Paul
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"It doesn't have anything on it that doesn't make it go faster."
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02-28-2006, 12:22 PM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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Not Ranked
This is going to be rich.  |
02-28-2006, 12:26 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
RS,
New build. I don't have anything to compare the new cam to.
I was just hoping someone with a big block and roller cam with around the same specs would speak up and let me know what to expect.
Will it be a lopey idle? Will it have a thump? Will it be radical?
Wasn't intended to be a hard question....
Help me out here Tru.
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02-28-2006, 12:56 PM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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Not Ranked
Dear Lord, Please allow me to hear this engine just once to know that there is someone just as nuts as I am.
Very radical. I think you may be able to idle in the 1000 to 1200 RPM range...as the car rocks with each loaping surge. I thought mine was high at .550, but .675? That's radical.
Yes, it will loap heavy and when you get just above the idle circuit, it will sound like cooking eggs ( a term we used to use a while ago ).
Send me all of the relative information so I can take an insurance policy out on your butt when you launch this thing for the first time.  |
02-28-2006, 02:03 PM
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CC Member
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Join Date: Apr 2004
Location: Scotts Valley,
CA
Cobra Make, Engine: ERA 289 FIA #2108
Posts: 1,882
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Not Ranked
http://www.classicchambered.com
I think I just figured out my exhaust.
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Dangerous Doug
"You're kidding, right?"
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02-28-2006, 03:07 PM
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CC Member
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Join Date: Nov 2004
Location: Grand Rapids,
Mi
Cobra Make, Engine: Hurricane 427S/C, KC/Pond aluminum 427/482 SO, TKO 600
Posts: 597
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Not Ranked
They make some nice sidepipe inserts. I've had the chambered exhaust on a new LS1 Camaro with long tube headers, and was very pleased.
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02-28-2006, 03:30 PM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,391
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Not Ranked
"How will it sound?"...
Like ROLLING-THUNDER!! 
Larry |
03-03-2006, 10:15 AM
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Senior Club Cobra Member
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Join Date: Aug 2005
Location: Toronto, Canada,
Ont
Cobra Make, Engine: Shelby CSX 4995, Keith Craft built 427 SO
Posts: 1,168
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Not Ranked
See "A Good Read" in All Cobra Talk, I think he describes it just about right!
__________________
"The 427 Cobra is easily the highest performance car ever sold for street use. A decent 427 - not the worst, not the best, will go from zero to 100 mph and back down again to zero in less than 14 seconds. All thing considered, you can put together a pretty good argument that the 427 Cobra is the ultimate performance car, judged on any basis you want to name." Taken from; Corvette, The Sensuous American
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03-03-2006, 10:17 AM
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Senior Club Cobra Member
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Join Date: Aug 2005
Location: Toronto, Canada,
Ont
Cobra Make, Engine: Shelby CSX 4995, Keith Craft built 427 SO
Posts: 1,168
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Not Ranked
See "A Good Read" in the All Cobra Talk, I think he tells it just about right!
__________________
"The 427 Cobra is easily the highest performance car ever sold for street use. A decent 427 - not the worst, not the best, will go from zero to 100 mph and back down again to zero in less than 14 seconds. All thing considered, you can put together a pretty good argument that the 427 Cobra is the ultimate performance car, judged on any basis you want to name." Taken from; Corvette, The Sensuous American
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03-08-2006, 06:21 PM
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CC Member
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Join Date: May 2004
Location: Sparta,
NJ
Cobra Make, Engine: West Coast Cobra, 427SO 2x4's, 630HP/600TQ
Posts: 242
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Not Ranked
Idle Description: "serious Authority"
Quote:
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Originally Posted by blykins
Since I changed from a flat tappet cam to a solid roller, I'm curious as to how my engine will sound with the new cam....
It's a custom grind solid roller from KC. 248/254 duration, .675/.682 lift with a 110 LSA.
Just curious as to what this thing will sound like when it's idling....thumpy? Rough?
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Blynk:
Mine is a KC build. Custom Solid Roller: 262/268 duration @ .050; .651/.670 lift with 110.0 separation which is relatively close to what you are going to be experiencing. Let me put it to you this way; in order to "talk" within 10 feet of the vehicle, you will have to stand in front, or in back of the car. Standing anywhere on the sides of the car requires a Marine Corps D.I. presentation. I am not being facitious one iota. It idles at 1200 in neutral and drops to 800 under load in gear (Race Prepped AOD). If you have a radio in the car; it just became useless. Passenger discussions are no longer in the equation. With a stick; you can idle at 800. The lope is more of a smooth, authoritative "rumble", not that stalling kind of lope and the sound is serious deep. On the downside: throttle response to 7000 is instantaneous coupled with a ton of torque and you can smokem through the first 3 gears. The first time the car breaks loose in 2nd or 3rd gear, you may wet your pants and "fear" will now be an integral part of your driving experience. (BTW: mines a porker at 3200lbs.) That fear had better give you a new found respect for your machine. Remember the word "fear"; it may save your life.
__________________
"Shut up and take the pain".
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03-27-2006, 04:19 AM
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CC Member
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Join Date: Jul 2001
Location: Senoia,
Ga.
Cobra Make, Engine: 427SO with big twin autolite inlines on custom intake, jag rear, top loader, wembeldon white, guardsmen blue stripes
Posts: 3,155
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Not Ranked
A solid roller sounds inviting but, longevity issues concern me...........
__________________
Perry
Remember!, there's a huge difference between a 'parts' changer, and a mechanic.
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03-27-2006, 05:24 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
Perry, with upgrades in technology, roller lifters are lasting a lot longer than they used to. Comp makes some pressure fed solid roller lifters now....that are living upwards around 20000 miles I believe.
It's gonna take me a lifetime to put 20000 miles on my Cobra....so the extra power I'll get from a solid roller is well worth it.
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