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Scott68B
Scott Costanzo
Columbus, Ohio
(539 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
AC Cobra Replica
Posted by: Scott68B
Date: March 08, 2015 08:32PM

I ran across this video this afternoon and I really liked how genuinely excited this guy got about the car. I got to thinking how a few of the cars here probably have the type of acceleration this Cobra has. Jim Stabe's car comes to mind. Looks like a lot of fun. Hope you enjoy it.






BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5761 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

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Re: AC Cobra Replica
Posted by: BlownMGB-V8
Date: March 09, 2015 12:09AM

I'd say that was quite a trick building that car to a weight of "Just under a ton".

Jim


Jim Stabe
Jim Stabe
San Diego, Ca
(712 posts)

Registered:
02/28/2009 10:01AM

Main British Car:
1966 MGB Roadster 350 LT1 Chevy

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Re: AC Cobra Replica
Posted by: Jim Stabe
Date: March 09, 2015 01:51AM

I agree with Jim B, you are not going to get that car to even "just OVER a ton". A real 427 Cobra is around 2400 lbs and that is pretty bare bones. That said, with over 600 hp you don't need it that light to get really mind bending acceleration.


Scott68B
Scott Costanzo
Columbus, Ohio
(539 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: AC Cobra Replica
Posted by: Scott68B
Date: March 09, 2015 08:03AM

Quote:
I'd say that was quite a trick building that car to a weight of "Just under a ton".

I believe the gentleman was referring to a British ton which I believe it about 2240 lbs.


Jim Stabe
Jim Stabe
San Diego, Ca
(712 posts)

Registered:
02/28/2009 10:01AM

Main British Car:
1966 MGB Roadster 350 LT1 Chevy

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Re: AC Cobra Replica
Posted by: Jim Stabe
Date: March 09, 2015 09:57AM

That might be doable if it has a small block with a lot of aluminum parts and not much gas in it.


JWD
Jim Durham
Gig Harbor, Wa.
(103 posts)

Registered:
01/22/2013 11:43AM

Main British Car:
1980 MGB Ford 302 (398.9 HP, 383.2 TQ)

Re: AC Cobra Replica
Posted by: JWD
Date: March 09, 2015 10:13AM

Having built one and being active in the Cobra community for many years and can say that the vast majority of small block Cobras fall into the 2200-2400 pound range. Add 200 for the big block cars.


kstevusa
kelly stevenson
Southern Middle Tennessee
(909 posts)

Registered:
10/25/2007 09:37AM

Main British Car:
2003 Jaguar XK8 Coupe 4.2L DOHC/ VVT / 6sp. AT

authors avatar
Re: AC Cobra Replica
Posted by: kstevusa
Date: March 09, 2015 10:21AM

Jim is probably correct on the weight. My car was weighed at the Omaha Ne. gathering with 3/4 tank fuel, "junk in Trunk" and maybe a cooler. The F/G rear cover, hood and SBF Cast Iron Block and rest aluminum (276RWHP & 308 Ft #'s Tq), T-5Z & 8.8 R/E weighed at 2457#'s. Probably could have jetisoned 15-20 #'s. Wonder what the 427 CID put to the rear wheels? Also difficult to imagine the accleration and braking force of that auto. 0-100-0 in how many seconds? The original test figure was listing in Hot Rod at the time and another test was done many years later with a slightly improved 427 Cobra. We live through the "Golden Years" and still survive! :-) Happy Days are here again
SAFETY FASTER!



Edited 1 time(s). Last edit at 03/09/2015 04:14PM by kstevusa.


Jim Stabe
Jim Stabe
San Diego, Ca
(712 posts)

Registered:
02/28/2009 10:01AM

Main British Car:
1966 MGB Roadster 350 LT1 Chevy

authors avatar
Re: AC Cobra Replica
Posted by: Jim Stabe
Date: March 09, 2015 11:48AM

Weight adds up quickly in a car as you modify it. Without putting much thought into it I always assumed my car would be in the 2400 lb range. It actually is right at 2700 lbs full of fluids and I still don't have a roll bar or upholstery in it. After a little thought, it makes sense.

A stock MGB roadster weighs in the neighborhood of 2100 lbs give or take.

The Chevy LT1 is probably about 100 lbs heavier than the MGB four banger. The 6 speed trans at 135 lbs is a good 60 lbs heavier than the MG. Adding 11" to the width of the car adds about 75 lbs of metal. The blower and all the mounts and plumbing is ~ 35 lbs. The wheels and tires add another 75 lbs over the MGB ones and the brakes add at least 20 lbs more. The gas tank is heavier and it holds another 3 1/2 gallons of fuel for another 33 lbs. The water/methanol tank and 3 gallons of fluid add 27 lbs. The cooling system holds an additional 3 + gallons of coolant for an additional 28 lbs. There is about 125 lbs of structural tubing in the car and the exhaust weighs about 20 lbs more than a stock MGB exhaust.

Add it all up and it comes to 598 lbs and when added to 2100 you get 2698 lbs. Although disappointed at the weight, with 535 flywheel hp and 550 flywheel torque it will still snap your head back when you floor it.


JWD
Jim Durham
Gig Harbor, Wa.
(103 posts)

Registered:
01/22/2013 11:43AM

Main British Car:
1980 MGB Ford 302 (398.9 HP, 383.2 TQ)

Re: AC Cobra Replica
Posted by: JWD
Date: March 09, 2015 12:09PM

I'm sure your MG is a rocket. My Cobra was slightly under 2500 lbs. with 415 RWHP. The big issue was lack of traction, even with sticky 295/50/15 tires.
My MGB should weigh in about 200 lbs or so less than it's original weight but with a much more mild engine than the Cobra.


Scott68B
Scott Costanzo
Columbus, Ohio
(539 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: AC Cobra Replica
Posted by: Scott68B
Date: March 09, 2015 01:46PM

My car weighed 2019 lbs with my V6 and half a tank of gas the last time I weighed it at the V8 meet in Wisconsin in 2008. I expect it to weigh a bit less than 2150 with a full tank and the V8. Hope Pete brings his scales to Indy!


Jim Stabe
Jim Stabe
San Diego, Ca
(712 posts)

Registered:
02/28/2009 10:01AM

Main British Car:
1966 MGB Roadster 350 LT1 Chevy

authors avatar
Re: AC Cobra Replica
Posted by: Jim Stabe
Date: March 09, 2015 01:55PM

Traction is better than I expected but I have 315-35-17 sticky tires on the back and I don't do hard starts because I don't want to break the rear end. I can feel it getting a little loose when I punch it from a roll and after shifts. Before I put the milder cam in it it had 543 rwtq (625 flywheel) and traction was a little more of an issue but nothing you couldn't deal with.



Edited 1 time(s). Last edit at 03/09/2015 01:58PM by Jim Stabe.


MGBV8
Carl Floyd
Kingsport, TN
(3639 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: AC Cobra Replica
Posted by: MGBV8
Date: March 09, 2015 03:37PM

A friend of mine has built two Factory Five 302 Cobras. He told me they were right around 2200 lbs. Seems about right for the small block.

[www.ffcars.com]


Scott68B
Scott Costanzo
Columbus, Ohio
(539 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: AC Cobra Replica
Posted by: Scott68B
Date: March 09, 2015 07:46PM

I think the trick would be to figure out what was done to this Cobra to get it to hook-up as well as it seems to.


MGBV8
Carl Floyd
Kingsport, TN
(3639 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: AC Cobra Replica
Posted by: MGBV8
Date: March 09, 2015 09:07PM

Click on XCS 427

[www.walker-partnership.com]


burner1
Gary W

(212 posts)

Registered:
09/24/2011 09:59AM

Main British Car:


Re: AC Cobra Replica
Posted by: burner1
Date: March 10, 2015 01:11PM

I know specifially of a Superformance Cobra just under 2300lbs with a bored and stroked 460 to 605 dynoed just under 700hp which does the 1/4 in the 10's...(then has to leave the track for lack of roll cage).


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