Join Date: Jul 2006
Location: Northfield, Illinois
If you have never broken a series 2 GTA main shaft, or had an original magnesium front cover crack at the distributor mount base / front cover interface, count yourself LUCKY. It ruins your race day. Most of these incidents happened in the Trans Am series here in the USA, but it was not limited to only Ausca prepared GTA's. The earliest shafts would absorb more abuse and twist than the less springy later shafts. When those broke, we made "shaft-links" out of them, if enough was left, allowing us to use a race prepared (double steel helical geared) 1600 Veloce pump with the broken off and now modified series 2 shaft top to drive the GTA distributor. See pictures below.
The cracked or sometimes shattered magnesium front covers were replaced with aluminum front covers also as seen below. We also broke quite a few of the early magnesium bellhousings, the second Autodelta version was better, the third Autodelta Mg housing the best. Early on as replacements, we used 1300 Alfa truck bellhousings made for column shift trucks in Europe, as they were physically heavier and thicker castings than the passenger car versions. I sold my last old column shift truck housing to a racer last year.
Most race-stress-testing was with the earliest cars, and both Alfa and Autodelta provided upgraded components over time.
Today I still build quite a few GTA oil pumps for racers and most have better components than we had in '65 with better metallurgy and more precise machining and hardening techniques.
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Illinois SNO Alfa Chapter Director
Illinois SNO Ferrari Chapter Director
and sometimes, CONFUSED AND INCORRECT, but Larry helps me out.
Illinois Chapter Director AND Charter Member of THE CONFUSED AND INCORRECT
Last edited by Gordon Raymond; 02-01-2019 at 04:06 PM.
Reason: add photos