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Old 28 Apr 2005, 17:35 (Ref:1289545)   #1
Kevin Whittle
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Cosworth SCA, SCB, SCC engines

How many Cosworth SCA engines were built?
Does any one know the split between carb and injection numbers built?

What was the bore stroke of the 1499cc SCB. It was claimed to deliver 175bhp. Was just one SCB engine built? and where is it now?

When the SCC was introduced, (to comply with USA class) was it a gear drive ohc, or was it chain drive
Or perhaps a mixture of gear drive to jackshaft then chain to sohc.

How many engines survive, I know that Cosworth has 2 engines, the one on display at 2004 Stoneleigh show was on carbs.
Why did they choose DCM over IDA Webers ?

So over to you experts please

Kevin Whittle
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Old 28 Apr 2005, 23:32 (Ref:1289746)   #2
Bryan Miller
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Kevin ,

The one only SCB is in Australia , came here in a BT21B Brabham built at the works by one of the employees , and came over at the end of , I think 1968.
Employee and builder was/is Neil Rear .

Car and engine are still together in Canberra .

Bryan.
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Old 28 Apr 2005, 23:34 (Ref:1289747)   #3
Bryan Miller
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Correction Neil Rear 2nd owner .
The man that was at Brabhams was / is Bob Illich of Western Australia.

Sorry about that Bryan.
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Old 29 Apr 2005, 09:08 (Ref:1289917)   #4
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A pal of mine has an injected one.According to a very well known engine builder they only built a handfull of these as well.
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Old 29 Apr 2005, 15:56 (Ref:1290170)   #5
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zefarelly should be qualifying in the top 5 on the gridzefarelly should be qualifying in the top 5 on the gridzefarelly should be qualifying in the top 5 on the grid
the SCA was a bore of 80.96 (std Ford) . . .I have a set of genuine Cosworth pistons sitting in their tube on the shelf at home . . .beautiful things, but I can't quite bring myself to put them in a cortina engine !!!
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Old 30 Apr 2005, 18:43 (Ref:1290671)   #6
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Hi Zefarelly,
what is the bore of your pistons, 80.96 ??

The SCA was 80.96 x 48.4mm = 997cc
The SCC was, I believe 85 x 48.4, ie same as 1098 FJ pushrod motor

But was the Only SCB 80.96 or 85 or ?? what bore x what stroke and was it injected.

It would seem to me that at 175bhp for a sohc 1498cc, it was getting close to the dohc FVA of 1600cc at I think around 210bhp ?

Bryan is the SCB now injected or on carbs ?

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Old 30 Apr 2005, 20:29 (Ref:1290701)   #7
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zefarelly should be qualifying in the top 5 on the gridzefarelly should be qualifying in the top 5 on the gridzefarelly should be qualifying in the top 5 on the grid
SCA 1964 997cc 115-140 Bhp. Formula 2, first Cosworth designed head, aluminum, 116E block, 5 main bearings,
SCB 1964 1498cc 175 Bhp. Experimental only
SCC 1965 1098cc 135 Bhp. Bored out SCA for North American Sports Car racing, Many SCAs conveted to SCCs, chain drive cam

all of these would be 80.96, as are the set I have its the standard Ford bore they just changed the stroke and block height/rod length

in a similar way I've got a 1600 crossflow block, bored overbore with flat top pistons and the block skimmed so I run a 1700 precrossflow in my road MK1 Cortina . . .bit more oomph :-)
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Old 3 May 2005, 21:28 (Ref:1292314)   #8
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SCA Markings

I have most of an SCA, and am wondering if anyone knows the Cosworth numbering system
My front covers/backplate is stamped
743

19645

GP

BB48

S15


??? any one know
Re numbers produced in Jan 1964 Cosworth were reported in Autosport as planning to build 25-30 SCA that year.

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Old 4 May 2005, 10:34 (Ref:1292680)   #9
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PeterMorley should be qualifying in the top 5 on the gridPeterMorley should be qualifying in the top 5 on the grid
When I had a Cosworth built twin-cam, Cosworth gave me the build details (e.g. type, spec. and first owner).

That had a 5 digit number that split as follows
type = 2 digits (e.g. 13 for the twin-cam)
number = 1 digit (e.g. 6 for the twin-cam, 6th one made - presumably this will go up to 2 digits as necessary)
year = 2 digits (e.g. 63 for the twin-cam)

The nearest number you have to that is 19645 which would suggest type 19, 6th one made but built in 1945 is unlikely. 5th one made in 1964 is a possibility?

I'm sure Cosworth should be able to help you, they still have the records.
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Old 4 May 2005, 11:26 (Ref:1292711)   #10
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Kevin,

The engine here is on down draft Webers , always has been.
As Peter advises , call Cosworth , very helpfull people.

Bryan.
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Old 6 May 2005, 15:53 (Ref:1294439)   #11
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I have been calling Cosworth all this week not to much avail, but am keeping on at them.
It seems early pistons had a central dish and two very deep depressions for the valves, later pistons only had a central depression. The later heads had a angled inlet port to promote swirl, as well as smaller exhaust ports.
Re the dates, I assumed 19645 was a late 1964 engine?
It has a cam box with provision at the rear to drive the injection pump, as per Cosworth photos of the engine fitted into a Brabham and raced by Costin in the 1965 Senior Service 200 Race.
Talking to Mike Costin in Nov last year he said that the engine needed too much ign advance to be efficient.
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Old 4 Mar 2010, 06:39 (Ref:2644604)   #12
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If anyone is still interested, I have just purchased 4 SCA and SCC engines that have been apart since the 60's. I don't know a lot about this engine, but it seemed like a good hobby project for me to put them together and get them running over the next couple of years. I need one for my Lola T-60, as it is currently running a Twincam and the SCA was the original engine. Since here in the states I will still have to run with the Twincam powered cars with the SCA, I figure I will build up the first one as an SCB 1500 so I can be a little more competitive. Rules here are such that the SCB will still be legal.
Judging from my engines, the SCC had a bore of 83.5mm so it should have had a stroke of 51mm or so vs. 48.4 for the SCA. I will measure the stroke on these cranks and see what I get. Also, though I have read that the SCC was chain drive, all of my engines are gear drive.

Regards,

Rob
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Old 19 Apr 2010, 06:25 (Ref:2675540)   #13
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So it turns out I have some cranks that are 48.4mm stroke and some that are 50.2mm stroke. The shorter stroke works out to 1000cc when paired with an 81mm bore, so I am guessing those are the SCA cranks. The 50.2mm cranks when paired with an 83.5mm bore gives 1100cc, so those must be the SCC cranks. The rod lengths are the same for both motors (5.434") and the pistons have different compression heights so that they both end up level with the top deck of the block. I am also in the process of making some new timing gears for cam drive to replace those that failed Magnaflux testing. New pistons and new cams are on order so this should get interesting pretty soon. I am also having new cam covers cast up as I do not have enough for all four engines and have not been able to find used ones.
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Old 20 Apr 2010, 12:36 (Ref:2676483)   #14
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Hi Rob

What size inlet and exhaust valves do the SCA and SCC have? Just to satisfy my interest....
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Old 20 Apr 2010, 17:30 (Ref:2676696)   #15
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Phoenix,

The SCA had 1.45" intake and 1.25" exhaust valves as standard. It appears that the SCB and SCC had the same, but I have seen a listing for an SCD engine, which was a 1500cc SCB engine with larger valves. The sizes listed are 1.55" intake and 1.30" exhaust. A couple of my cylinder heads have modified ports and larger valves but I am thinking this was done by the customer and not by Cosworth.

Regards,

Rob
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