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Old 11-06-2021, 02:09 PM   #1
Rallye Sport
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Default Cortina GT500 Info, Sightings and Rumour

We recently lost the Mk1 Cortina forum and fordcortina.com.au sites and with them alot of info and chat on the Mk1 Cortina GT500.

I thought I'd start this thread to gather back some of this info and shed some light on this model.
Firstly I'm no expert on the subject and welcome corrections, contributions and chat on this model.

The Cortina GT500



After the success of the Cortina GT's in the 1963/64 Armstrong 500 Harry Firth was commissioned to build a new homologation variant to take on the threat of the Mini's.
With a few exceptions of cars bought in for motorsport Australian Cortina GT's were typically 4 door sedans. The GT500 was based on the 2 door shell.
Under the rules of the time imported cars required 250 items whereas locally built cars required a number of 100.
Reported numbers of the GT500's built vary from 100 to 120.
The GT500 placed first and second in the 1965 race in the hands of Bo Seton/ Midge Bosworth and Bruce McPhee/ Barry Mulholland. This was mainly due to having to take less stops with the fitment of an extra 8 3/4 gallon fuel tank taking capacity up to 17 gallons in total.

Identification

GT500's were assigned the model code 27134.
Externally they received a '500' badge on the rear quarter in front the GT badge.



There was twin fillers for the auxiliary tank behind the rear windows and the original rear filler was crudely blanked off.





There was also aluminium brake ducts on the front of the car.





To allow the car to run the race without an air filter one was supplied, but in a brown paper bag in the boot upon purchase.

Amongst other modifications the 1500GT engine had a higher compression ratio, ported head, revised camshaft and copper/ asbestos head gasket.

Specs taken from here https://www.uniquecarsandparts.com.a...specifications

Capacity: 1498cc
Type: Conventional, watercooled four stroke, reciprocating piston type, 4 cylinders, OHV Cross-Flow Bowl-In-Piston featuring 5 main bearing cast-iron crank-shaft, with integral weights dynamically balanced

Configuration: Front mounted, longitudinal, inline

Head: Pushrod and rocker actuated ohv with integral guides cast into fully machined cast iron ported and polished cylinder head, with special copper asbestos head gasket.

Other modifications: Dynamically balanced 5 bearing cast iron crankshaft with integral weights running in new type steel back copper lead bearing liners. Lightened and balanced flywheel and clutch assembly together with a special crankshaft pulley of machined steel. Connecting rods and H-section forging with steel backed new type copper lead bearing liners. Special conrod bolts with enlarged bolt-head and and lock tabs. Camshaft ground to revised specification. Cast aluminium alloy inlet manifold and dual barrel down draught carburettor with revised chokes and jetting. 3-point rubber suspension of engine and gearbox.

Fuel System: Single dual barrel down-draught Weber with differential throttle opening. Modified choke, emulsion and jet sizes

Bore and Stroke: 3.187 x 2.86 inches

Power: 95.0bhp at 6000rpm

Torque: 101.5lb-ft (Nm) at 3600rpm

Compression Ratio: 9.5:1
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Old 12-06-2021, 10:09 AM   #2
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Default Re: Cortina GT500 Info, Sightings and Rumour

On too a few rumours, maybe someone can shed some light on these.

Apparently the first batch of 20 cars were supplied without sound deadener. These cars were to be the racers with the others being built just to make up numbers. Not as much attention was lavished on the road going cars.

I've also heard over the years that the racers were only given a light coat of primer and paint to help save more weight.

The camshafts seem to be a point of debate aswell with the racers possibly receiving a hotter cam than the run of the mill versions


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Escort RS2000 Restored factory a/c and alloys.
TD Cortina Unrestored 35 000km 6cyl manual.
Mk1 GT Cortina Project.
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Old 13-06-2021, 02:54 AM   #3
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Default Re: Cortina GT500 Info, Sightings and Rumour

Sorry to hear the old forum has gone. Try this and see what you can salvage:

https://web.archive.org/web/20200324...p?action=forum
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Old 13-06-2021, 10:35 AM   #4
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Default Re: Cortina GT500 Info, Sightings and Rumour

was it lost due to inactivity because of facebook or other sites?
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Old 13-06-2021, 03:58 PM   #5
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Default Re: Cortina GT500 Info, Sightings and Rumour

Pretty sure it was inactivity combined with lacking the time and enthusiasm to keep it going. The lady who ran it unfortunately passed away and her partner was devastated, naturally. He didn't have the will to keep it up.
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Old 13-06-2021, 06:26 PM   #6
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Default Re: Cortina GT500 Info, Sightings and Rumour

[QUOTE=Rallye Sport;6588720]
Externally they received a '500' badge on the rear quarter in front the GT badge.

I always thought that 500 badge may have been pre production prototype for the Falcons that arrived a few years later with the 500 badge, but the ones in the photo definitely wipe out my thoughts on that, looks like a different font.
I have seen GT 500 at a local car show around here in Central Qld, a year or so ago.
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Old 14-06-2021, 12:20 AM   #7
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Default Re: Cortina GT500 Info, Sightings and Rumour

Jamie Cornwall has just finished his 500.
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Old 14-06-2021, 12:40 PM   #8
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Default Re: Cortina GT500 Info, Sightings and Rumour

Quote:
Originally Posted by xb74_black View Post
Sorry to hear the old forum has gone. Try this and see what you can salvage:

https://web.archive.org/web/20200324...p?action=forum
Awesome, thanks for that I'll do some digging on there.
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Escort RS2000 Restored factory a/c and alloys.
TD Cortina Unrestored 35 000km 6cyl manual.
Mk1 GT Cortina Project.
FG XR50 Daily.
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