Please help with my GTAm rep! - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 25 (permalink) Old 03-13-2019, 01:04 AM
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ok clear. As far as I know the repro bars are the same in dimension. Mine is a reprobar too btw. maybe maybe there is a problem?
Other solution may be grinding off the bar..
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post #17 of 25 (permalink) Old 03-13-2019, 02:33 AM
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Veloce75za states his trunnion is late type 1750 GTAm....I can find no reference to any differences with earlier type.

Just a quick search in Don Black's magical Competition Reference Handbook states "CRBB System - sliding block rear axle to you and me - Developed for GTA's but useable on all 105 chassis and 101's with modification...."

Alleggerita by Adriaensens/Dasse shows two versions of the trunnion bar; to my eye they are identical in shape but have different end mounting castings -function and type identical and part number appears unchanged! No trunnion fotos in the 1750 GTAm section. However, the same foto is used for homologation documentation purposes for both GTA 1300j and GTAm.

I am leaning towards faulty repro manufacture....

Richard
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post #18 of 25 (permalink) Old 03-13-2019, 04:33 AM Thread Starter
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Mine is a repro for sure. It has come off my race super where it fits absolutely fine and I have been racing with it for a number of seasons. The floor is just too deep on the drivers side (LHD).

I'll check it against the original one and report but I am almost certain the problem is in the body shell. I have no idea how Auto Delta solved this on series 2 cars.
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post #19 of 25 (permalink) Old 03-13-2019, 10:34 AM
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Autodelta: 5 seconds with a hammer. It's the road car for homologation purposes that needed the interior dimensions.

Sometimes we over think things 🙂
Pete

'71 1750 Series 2 GTV:
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post #20 of 25 (permalink) Old 03-13-2019, 01:09 PM
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Some trunnion Measurements

So I got out my 2 types of original Autodelta sliding block trunnions for Measurement.

But first let me say that the thin ended one came bolted onto my GTA Corsa and I have no reason to think it had not been there since 1966. The thick ended one came on my 64 Sprint GT Bulova racer and will have been installed sometime in the early 1970s. A same type also came on my other Bulova Car, a 69 GTV and also would have been installed in the early 1970s. These last 2 would have been sourced most likely at BOBCOR in Buffalo, 1-1/2 hours from Toronto. These observations leads me to think that the thin ended one is the early version. Alleggerita second edition, IDs that type as the late version. Also note that the thick ended version shown has been broken and weld repaired.

So you can see from the pictures how I took my measurement. Both measure about 16 mm from the straight edge to the top of the trunnion.

So if Veloce75za, the thread starter, can make comparable measurements we might learn something or not.

Regards

Ken

PS: for those interested in such things, the thin ended trunnion weighs 3.345 kg with bolt and the thick ended trunnion weighs 4.635 kg with bolt, reinforcement plate and weld fillet.
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Ken Geiger, Toronto
1965 GTA, RHD, Stradale
ex- 1965 GTA, RHD, Corsa, Trans/Am 66-72
1964 Sprint GT, B-Sedan in 70's
1970 Giulia Super (CDN Spec)
1976 1600 GTj (Italian Spec)
1966 Harley Sprint (Aermacchi) 250
2000 Catalina 320, Hull #765 Northern Dream
2001 BMW Z3 3.0i

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post #21 of 25 (permalink) Old 03-18-2019, 06:51 AM Thread Starter
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Thank you all for the effort, in a desperate attempt to get the car rolling I used a hammer. It needed a few well placed swings and it may need a touch up but the bar now fits. It actually needs massaging (hefty blow) to both sides of the floor. For interest sake the problem is more the height clearance so the floor needs to be beated up rather than in if you get my drift.

Happy to report all is well and everything now fits, just.

Thank you all again

Trevor
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post #22 of 25 (permalink) Old 03-18-2019, 11:57 AM
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Quote:
Originally Posted by Veloce75za View Post
Thank you all for the effort, in a desperate attempt to get the car rolling I used a hammer. It needed a few well placed swings and it may need a touch up but the bar now fits. It actually needs massaging (hefty blow) to both sides of the floor. For interest sake the problem is more the height clearance so the floor needs to be beated up rather than in if you get my drift.

Happy to report all is well and everything now fits, just.

Thank you all again

Trevor
If you still can please take a minute to take a measure to compare to mine and say who the repro came from.

Thanks

Ken

Ken Geiger, Toronto
1965 GTA, RHD, Stradale
ex- 1965 GTA, RHD, Corsa, Trans/Am 66-72
1964 Sprint GT, B-Sedan in 70's
1970 Giulia Super (CDN Spec)
1976 1600 GTj (Italian Spec)
1966 Harley Sprint (Aermacchi) 250
2000 Catalina 320, Hull #765 Northern Dream
2001 BMW Z3 3.0i
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post #23 of 25 (permalink) Old 03-18-2019, 12:53 PM
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While I understand you are creating a replica and therefore want to follow a traditional GTAm build, it surprises me that Autodelta and others since, don't just weld a location point for that single trailing arm to the floor with it's location reinforced by roll cage members. I guess there must not be much load on that suspension arm, and that alloy beam does not weigh much, but a couple of plates surely would be lighter and more rigid ... ?
Pete

'71 1750 Series 2 GTV:
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post #24 of 25 (permalink) Old 03-19-2019, 05:33 AM
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lets not discuss the decisions the Italian engineers made back in those days....... (many times form not function predicted their choices. )...
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post #25 of 25 (permalink) Old 03-28-2019, 08:57 PM
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Well played Trevor, will we see you at Simola with your new toy ??

Aye
Greig

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Some 105's
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