AC Owners Club Forum

AC Owners Club Forum => Cobra (Thames Ditton) Forum => Topic started by: MkIV Lux on February 12, 2018, 12:58:24

Title: Seen at Retromobile Paris 10.2.2018
Post by: MkIV Lux on February 12, 2018, 12:58:24
CSX2433
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: MkIV Lux on February 12, 2018, 13:16:52
more info
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: MkIV Lux on February 12, 2018, 13:20:52
CSX2075
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: MkIV Lux on February 12, 2018, 13:21:51
CSX????
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: TTM on February 15, 2018, 18:41:35
That blue Cobra looked pretty good. If perhaps not original I really liked the rear wing treatment.

I also spotted in a corner a dark red Ace Bristol apparently fitted a 289 V8 engine, BEX 235.

If you go next year then drop me a pm, we could meet for a beer.
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: MkIV Lux on February 16, 2018, 07:24:50
That blue Cobra looked pretty good. If perhaps not original I really liked the rear wing treatment.

I also spotted in a corner a dark red Ace Bristol apparently fitted a 289 V8 engine, BEX 235.

If you go next year then drop me a pm, we could meet for a beer.

I'll  take you up for the beer, TTM  ;)

what about these rear wheels on CSX2075? Are they period? Cannot understand what the nuts do there? 2 eared spinner indicates splined hub.
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: rr64 on February 16, 2018, 15:47:19
what about these rear wheels on CSX2075? Are they period? Cannot understand what the nuts do there? 2 eared spinner indicates splined hub.

Shelby American Inc. offered “spline drive” magnesium wheels made by American Racing as street and racing options. There were two design types, the original with ‘hidden lugs’ and the revised with ‘exposed lugs’. Both wheel assembly designs incorporated steel adapters bolted in from the rear of the wheel and steel sleeves on the outboard side to be hard wear surfaces for standard AC logo center lock “knock off” nuts. All wheels were for 15” diameter tires.

Cobra wise buyers could get widths between 6.0 and 8.5 inches with the 6.0 models being unique to Shelby American and Cobras. American Racing added 6.5 through 8.5 inches wide models to their aftermarket catalogs.

6.0 inches wide wheels generally work without coachwork modifications on all four corners. A popular combination was 6.0 inches wide front and 7.0 inches wide in rear. 7.0 inches wide wheels in rear and or extra large tires could require modification of wings depending on the particular chassis as some coachwork width variation was normal.

An additional strengthening revision was made at some point but I don’t know when, a rib was added inside each wheel spoke. See the last image below.

Street and road racing wise the first ‘hidden lug’ design assembly proved generally satisfactory durability wise. The first design was not good on the rear for drag racing as the lug bolts tended to wallow out the magnesium they were threaded into. The solution was the ‘exposed lug’ revision whereby acorn type ‘lug nuts’ and the bolts captured the hub of the magnesium wheel between them. The second Shelby works “Dragonsnake” used the new design exposed lug wheels.

Neither design wheel assembly is light weight as compared to any version of 'pin drive' magnesium wheel Shelby American used.

Regarding CSX2075, I have been seeing pictures taken of the car between the 1960s and its marketing photos for sale last year with drag race exposed lug wheels.


This wheel is 8.50 wide and was used for many years on the rear of a Cobra but it illustrates the ‘hidden lug' bolts threaded directly into the magnesium.

(http://www.clubcobra.com/photopost/data/500/15x8_5-1.jpg) (http://www.clubcobra.com/photopost/showphoto.php/photo/65325)

This is a new old stock 6.0 wide made specifically for Cobras ‘exposed lug’ wheel I once owned shown front and reverse side.

(http://www.clubcobra.com/photopost/data/500/15X6-Front.jpg) (http://www.clubcobra.com/photopost/showphoto.php/photo/65320)

(http://www.clubcobra.com/photopost/data/500/15X6-Rear.jpg) (http://www.clubcobra.com/photopost/showphoto.php/photo/65321)

Dan
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: Mark IV on February 16, 2018, 15:48:55
The nuts are on wheel studs like a standard car but hold the steel splined insert to the wheel. Sort of like knock-off adaptors but rather than adapting a bolt-on setup to spinner, this allows the spline drive hub to work with an alloy wheel which would wallow out the spline in the wheel if not for the steel insert.
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: MkIV Lux on February 16, 2018, 16:28:31
thanks to both for the comprehensive explanation; all clear now  :) :)
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: SunDude on February 17, 2018, 17:33:42
Any info on this particular Cobra? Chassis number? Owner's name?

The booth was Équipe Europe if that helps ID the car.

(https://www.acownersclub.co.uk/forum/index.php?action=dlattach;topic=4374.0;attach=6324;image)
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: MkIV Lux on February 17, 2018, 19:04:46
No clue, the stand was unmanned when I passed, so could not question anybody :(
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: rsk289 on February 18, 2018, 23:13:35
The nuts are on wheel studs like a standard car but hold the steel splined insert to the wheel. Sort of like knock-off adaptors but rather than adapting a bolt-on setup to spinner, this allows the spline drive hub to work with an alloy wheel which would wallow out the spline in the wheel if not for the steel insert.

Just out of interest, this was commonly seen on British sportscars with alloy wheels and splined centres - Austin Healeys, TRs, Jags etc. used the steel bolt-in insert.  They're still made like this on the bigger Minilite-style wheels.
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: MkIV Lux on February 19, 2018, 14:09:38
thanks RSK289 :)

does anybody know what the two devices here are about?
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: rr64 on February 19, 2018, 15:32:31
thanks RSK289 :)

does anybody know what the two devices here are about?

Line lock switch and reverse gear block out I believe. The car was a very serious drag race car for a long time from new.
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: MkIV Lux on February 20, 2018, 07:03:46
her is a photo from another angle?
on what does the line lock switch act?

Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: silty on February 20, 2018, 08:44:11
A common piece of kit for drag racing which locks hydraulic pressure in the front brakes and allows the rear wheels to spin for burnouts. This link shows the components comprising the line lock:

http://www.hurst-shifters.com/products/1745000-launch-control-roll-control-with-stainless-valve/

Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: AC Ace Bristol on February 20, 2018, 08:53:01
.
Constant


Line lock is used to lock the front wheels and hold the car on line whilst the rear (drive)  wheels rotate as engine revs increase prior to releasing the line lock
and launching the vehicle off the line.
Main feature / accessory in drag racing. :-\

Keith
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: MkIV Lux on February 20, 2018, 10:07:42
many thanks, Silty and Keith,

Guess this is not street legal  :-\ or is it fool proof ?

My modern Mercedes C has electrical "handbrake", acting on rear wheels. I did not yet dare to test its functionality at 60 mph.
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: A-Snake on February 20, 2018, 15:47:10
Any info on this particular Cobra? Chassis number? Owner's name?


Just a WAG, COX6015 ?
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: SunDude on February 21, 2018, 00:44:56
Any info on this particular Cobra? Chassis number? Owner's name?


Just a WAG, COX6015 ?

COX6003, perhaps...? Assuming the following forum post is accurate, the side view mirror and interior details look the same.

See www.forum-auto.com/les-clubs/AC-Cobra/sujet50-35315.htm#t45769
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: A-Snake on February 21, 2018, 15:55:20


Quote
COX6003, perhaps...? Assuming the following forum post is accurate, the side view mirror and interior details look the same.

See www.forum-auto.com/les-clubs/AC-Cobra/sujet50-35315.htm#t45769

Agree, if the post is accurate, COX6003 would fit.
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: westcott on February 26, 2018, 15:59:06
Same car but without line lock and reverse gear block ? Took the pictures during ECM 2014 close to St. Tropez.
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: MkIV Lux on February 26, 2018, 16:21:13
Same car but without line lock and reverse gear block ? Took the pictures during ECM 2014 close to St. Tropez.

I'm afraid you mix up cars here, Uwe; You've seen COX6003 whereas the line lock and reverse gear block is on CSX2075;

Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: SunDude on March 11, 2018, 13:42:18
I'd say the red 289 Cobra from Retromobile 2018 is confirmed as COX6003: www.historiccars.fr/1964-ac-cobra-mkii-289.html
Title: Re: Seen at Retromobile Paris 10.2.2018
Post by: TTM on February 06, 2019, 21:04:17
I'll  take you up for the beer, TTM  ;)

Just thought I'd resurrect this post to see if anyone on here will be in Rétromobile this year?
Went tonight to have a first quick look and will return on Friday afternoon until late.