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Discussion Starter #1
Alfa Romeo - Forged Factory Race Crankshaft - Used in the short stoke 1300 cc Autodelta race cars. Fully balanced with 8 counter weighted throws.

67.5 mm crank used in conjunction with the larger bore, bigger valves of the 1600cc Alfa race motors to make a big bore / short stoke / long rod > with better rod to crank throw ratio > high Rev SCREAMER.

Mains cut -.o10"
Rods Standard size journal
Within FACTORY SPECS.

Oil passages drilled / threaded / plugged.

FIA Homoligated - Legal upgrade for 1300cc Vintage Alfa Racing.

Used in a Sports Racer back in the mid 60's and been on the shelf since.....
Great shape - I'd just confirm dimensions yourself and just micro polish.

Ask questions direct through my phone of email.

I've got a bunch of 1300/1600/ and one similar Forged 8 counter weighted 1750 GTAm - cranks available.

Currently on eBay for more Pics- Alfa Romeo / AUTODELTA / GTA Jr. 1300 / Short Stroke - 67.5 mm Crankshaft | eBay

$1200 / Best Offer

Chris D
585 330 5456
[email protected]

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Chris, wasn’t the 67.5mm crank used with a 1750 bore and head (not 1600) to make the short stroke 1300? If I’m not mistaken, Alfa put these in the production Giulietta Nuova.
 

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The 8 counterweight 67.5 stroke crank is actually of 1300GTA origin. 68.5mm versions of the same crank were also used for shortstroke variations of 1600 GTA engines with varying bore sizes to give 1500 & 1600 capacities.
Later production Nouvo 1300 were 4 counterwieght used with 80mm bore & 1750/1.8 head.
regards, Vince.
 

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Discussion Starter #4
Per the old Alfa Performance Option Catalogue found in the the excellent CarDisc CD's from Leo A. the Jr's bore was 78 mm. If you do the math 1300cc comes out right for the 78mm bore X 67.5mm stroke. The Valve size is also listed as 45 intake/41 exhaust same as the 1600 GTA. I believe the original intent was to Homoligate a 1300 for the smallest Sedan Racing classes as simple as possible with just a crankshaft and rod change based on the developed 1600 engine. However as everything Alfa the Comp catalogue shows several head options with different valve angles and 2 and 4 valve options.

Neat stuff back then when the factories developed over the counter parts for both the racers, rallyists, performance street cars and even boats.

The 1300 have a special interest for me. One of the first race cars I ever helped work on when I was learning the ropes in the mid 70's in SCCA racing was a true Twin plug 1300 GTA Jr owned by Rochester based Roger Clouser. These parts came out of Jack Laurences shop in Jamestown NY who is know for of all things developing Saab Sonnets into National winning cars. I probably learned more from Jack than anyone else. In the early/mid 60's Jack build some of the prettiest D and C Alfa power Sports Racers.

Chris D
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