Need s some advise on converting my Alfetta gtv 4 to a V6

darryl longley
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by darryl longley » Sun Feb 21, 2016 9:19 am

Giuliettaevo2 wrote:Neatly welding in engine mounts and chassis number is not easy. But makes more sense to me as neatly welding in a complete rear trunk floor...

Never seen or heard of a 2.0 with v6 tank and battery placement from the factory. But hey,they 're italians sorry anything is possible i guess. :wink:
after loads of research I have come to the same conclusion
maybe they had a surplus of v6 chassis and needed to fulfil an export order
in a way I'm glad as the only difference is the front mount
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by kevin » Sun Feb 21, 2016 3:19 pm

In late 1984 in South Africa there were quite a few GTV 2.0 that were actually made from excess GTV 6 shells . So battery was in boot and tank behind rear seats , the hubs were five bolt pattern however the torsion bars and callipers were same as 2.0 . Estimate about fifty of these cars were made . Also they had full recaro interior with long dashboard . The chassis numbers were never stamped into the chassis but rivetted onto plates in the inner wings .
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by darryl longley » Mon Feb 22, 2016 4:04 am

kevin wrote:In late 1984 in South Africa there were quite a few GTV 2.0 that were actually made from excess GTV 6 shells . So battery was in boot and tank behind rear seats , the hubs were five bolt pattern however the torsion bars and callipers were same as 2.0 . Estimate about fifty of these cars were made . Also they had full recaro interior with long dashboard . The chassis numbers were never stamped into the chassis but rivetted onto plates in the inner wings .
this is a late 84 and is as you described ive checked calipers and torsion bars which are tge same as the v6
wonder if some of these were exported to the Belgium market ill check the number on chassis
1 had a 147 2002 2.0 t spark which was a Belgium import
That had no external boot opening and no control buttons on the steering whell

but hey
That's Alfa
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by Alfaaa1 » Thu Feb 25, 2016 7:46 pm

My Update , Just finished making the Engine mount extensions.
Just need to weld them. :D
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darryl longley
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by darryl longley » Mon Feb 29, 2016 12:45 pm

good work there mate
next dilemma is the fuel injection wiring
Ive got the wiring with the ecu but how to splice it in is going to be a head scratcher
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by Alfaaa1 » Mon Feb 29, 2016 4:41 pm

Thanks Darryl,
I am going to use a Motec ECU Hopefully I done have too much of a issue.

I am having a bit of an issue with the flywheel bolts, i have fitted the flywheel with the 4 mm spacer and need 12Mx1.25 by 34mm long bolts. these bolts are very hard to get. Would you know any Alfa with these flywheel bolts sizes. :?:
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by Jim K » Tue Mar 01, 2016 1:57 am

You need the flywheel bolts from a 75 V6 Motronic engine with the 1.25mm pitch bolts. Early engines had 1.5mm pitch but somewhere along the line they were changed for 1.25mm. If you can't find them, you can look for the same size in Allen-head (hex) design, but they must be high grade 12-12.9.

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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by 75evo » Wed Mar 02, 2016 10:43 am

You should use Autronic. Beninca is in your area. I think the Autronic SM4 is about 1/2 the price of Motec M800.
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by Alfaaa1 » Thu Mar 03, 2016 7:15 pm

Hi Jim,
I had been to a bolt supplier for the flywheel bolts and he has recommended Allen-head grade 5 titanium bolts, They are just under grade 12-12.9 .
Has any one used these bolts for mounting their flywheel. :?:
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by Jim K » Fri Mar 04, 2016 6:02 am

Titanium bolts? :shock: I don't know how they compare to steel ones. This is something the mechanical guys can tackle, the 3M's -Maurizio, Mats, Micke? 8) As far as I know, Ti bolts are only used in corrosive environments but lack in tensile strength. Hardness and tensile strength are different things.

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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by Giuliettaevo2 » Fri Mar 04, 2016 10:25 am

http://www.fabory.com/nl/Bevestigingsar ... 7041120040

This is what you need. Unfortunately not available in 35mm length.

I can probably get them for you.shipping might be expensive however... The bolts themselves are not cheap either.
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by 75evo » Sat Mar 05, 2016 11:27 am

Why titanium bolts? I've never heard of any flywheel bolts failure before. Down there a badly lighteed flywheel or giubos are probably the first to go.
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by darryl longley » Sat Mar 12, 2016 10:04 am

hi all the engine is sat nicely in the car
Just a quick question
Ive heard because gtv rear bell housing mounting points on the transmission tunnel are slightly different to the gtv6 I need some spacers before I bolt them up
Does anyone know the thickness of these
Thanks
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by Maurizio » Tue Mar 15, 2016 12:56 am

Jim K wrote:Titanium bolts? :shock: I don't know how they compare to steel ones. This is something the mechanical guys can tackle, the 3M's -Maurizio, Mats, Micke? 8) As far as I know, Ti bolts are only used in corrosive environments but lack in tensile strength. Hardness and tensile strength are different things.

Jim K.
Ti bolts is nice stuff, a bit overdone for what you want here. As the price will shock you a little bit.
I'm not sure what grade the standard bolts are, my memory recalls a 10.9 grade.
*edit*
JimK states in the post below 12.9 grade, his memory is more often refreshed with this stuff :lol:
*edit*
The standard bolts will just do fine with the correct torque, secured with the correct locktite will do the job!


So for the sake of improving common knowledge:

A Ti gr5 bolt is strength wise (Rp0.2!) just below (90%) a 10.9 grade bolt.
Ultimate strength is just above a 10.9 bolt, but you don't want to use a bolt in that region :wink:

But the real advantage: low young's modules, so larger elastic deformation due to the pre-tension.
Which says something about the quality of a connection.
Simply explained, setting/relaxation behavior in the connecting parts has less impact on the end tension in the connection.
Ti has a low density, so low mass with regards to a steel bolt.
Last edited by Maurizio on Tue Mar 15, 2016 2:24 pm, edited 3 times in total.
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Re: Need s some advise on converting my Alfetta gtv 4 to a V

Post by Jim K » Tue Mar 15, 2016 3:49 am

Std Alfa flywheel bolts are grade 12.9 !!

Jim K.
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