Please help with my GTAm rep! - Alfa Romeo Bulletin Board & Forums
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post #1 of 25 (permalink) Old 03-11-2019, 02:05 AM Thread Starter
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Please help with my GTAm rep!

Good Morning,

I am trying to build my 1750 GTAm Rep in a big hurry and I have hit a snag with the rear Trunion arm which is a later type GTAm unit. It simply does not fit my shell (Mk2 1750 LHD Italian built).

It seems like the floors are too deep and intrude into the space where this bar is normally located. Has anyone run into this problem before and is there any way to solve it? Please see pics below. I would appreciate any feedback. thanks.
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post #2 of 25 (permalink) Old 03-11-2019, 04:43 AM
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that is correct. You have to use a hammer to modify the floor a bit to make the room. too bad this was not done before paint.
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post #3 of 25 (permalink) Old 03-11-2019, 04:55 AM Thread Starter
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Thanks Veep,

I had no idea it would not fit. It is a great pity.

How big a job is it actually? it is a lot of hitting or a small amount?

Thanks for the reply.
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post #4 of 25 (permalink) Old 03-11-2019, 08:57 AM
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I have had Three GTs with Sliding block installed and have not noticed that the floor was hammered to make the cross piece fit.

And do let us know your final solution.

Ciao

Ken

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1965 GTA, RHD, Stradale
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1964 Sprint GT, B-Sedan in 70's
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post #5 of 25 (permalink) Old 03-11-2019, 11:02 PM
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Hi

Ken, I, too, am surprised a 1750 floor needs modifying (or is it a trunnion problem?)... but Veep suggests normal!

Veloce75za, please post some after pics, thanks.

Richard
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post #6 of 25 (permalink) Old 03-12-2019, 04:42 AM
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It was needed with my car. Also with several others I have seen. Depends on which body-year it seems.
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post #7 of 25 (permalink) Old 03-12-2019, 05:03 AM
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Ok so the GTs I refer to were on 64 spring GT, a 65 GTA and a 69 GTV Canadian Spec. I guess the GTV is the most relevant to this discussion and it is long sold and I only see it occasionally at vintage races.

Ciao

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 #8 of 25 (permalink) Old 03-12-2019, 07:13 AM
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ken

yours may have more room than the late body shells. there are at least 3 different bulk heads in that area for 105 gtv shells i have notice. early 1 stepnose, 2 mid step nose, series 1 1750 and 3 the series 2 1750/2000.

they were updated progressively since over a sharp bump laden with heavy luggage in the trunk, can put a nasty kink in the rear fenders as i recall. a light tap in the rear will make your car look like the titanic heading for the sea floor on the early cars.
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post #9 of 25 (permalink) Old 03-12-2019, 07:18 AM
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Quote:
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ken

yours may have more room than the late body shells. there are at least 3 different bulk heads in that area for 105 gtv shells i have notice. early 1 stepnose, 2 mid step nose, series 1 1750 and 3 the series 2 1750/2000.

they were updated progressively since over a sharp bump laden with heavy luggage in the trunk, can put a nasty kink in the rear fenders as i recall. a light tap in the rear will make your car look like the titanic heading for the sea floor on the early cars.
as far as I know its the series 2 shell (1750 and further) that has this issue. My shell is a 1972 GTV2000.
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post #10 of 25 (permalink) Old 03-12-2019, 07:21 AM
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here you can see the area where the contact is. My bodyshop did weld a slight bump in there.
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post #11 of 25 (permalink) Old 03-12-2019, 07:28 AM
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and one from the inside.
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post #12 of 25 (permalink) Old 03-12-2019, 07:37 AM
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How much of the issue is accuracy of the repro vs. change in body?
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post #13 of 25 (permalink) Old 03-12-2019, 08:54 AM
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Quote:
Originally Posted by Alleggerita View Post
How much of the issue is accuracy of the repro vs. change in body?
how do you mean this? if its a racer that will drive under rules where the car has to comply with homologation papaers and the other rules in class one makes other choices than for a street car. I would not fit a SB on a street car (that would be a watts, if not simply the stock trunion or a alu version of it).
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post #14 of 25 (permalink) Old 03-12-2019, 11:19 AM
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We never had this problem??? Perhaps this peace of aluminium is a replica and is not correct in dimensions? But general the floors of chassis after 1970 is deeper following the rules of Fia after protests from Ford agains the homologation of GT / GTA as touring cars... the inner dimension has to be greater, specially the distance over the rear seats between seasts and inner roof , so Alfa did new , deeper rear seats and modified the floors....thus was the second protest of Ford...1968 Alfa just changed the inner roof ...the caset came to enlarge the ditance...

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post #15 of 25 (permalink) Old 03-12-2019, 06:00 PM
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I think you are misunderstanding ...

The question I raise is whether the reproduction trunnion/cross bar depicted has an identical shape to the original or whether it is the shape of the floor that is the issue here ....

Obviously, the OP uses a reproduction sliding block trunnion/cross bar with a diff modified for Watts.

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Originally Posted by Veep View Post
how do you mean this? if its a racer that will drive under rules where the car has to comply with homologation papaers and the other rules in class one makes other choices than for a street car. I would not fit a SB on a street car (that would be a watts, if not simply the stock trunion or a alu version of it).
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