Twin Carb’s

Started by lhodgo, February 25, 2018, 05:32:42 PM

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lhodgo

Any preference on fibre over paper gaskets and plastic over copper filters? I have both as a backup, wondering which to fit straight up? Thanks.

carlo rossi

all good I prefer fibre and copper
old school
current cars
red 83 gtv 2.0


previous cars
Red 76 1.2/1.5 alfasud ti
white 79 alfetta 2000
alfetta 74 1.8
escort Lotus twin cam
bikes
ducati 900 ss 1979
moto morini 3 1/2 sport 1975/6
Moto morini 3 1/2 valentini speciale 77 oh and a deltek rockhopper

lhodgo

Well I've got both, might go old school and keep the others as spares!

lhodgo

So I've got some aluminium mounts to upgrade from the original rubber ones and some 50mm extensions to increase the inlet and get some better performance (I hope). Question is, where does the rubber o ring seal? Against the carb (top one in image) against the extension (bottom one in image) or should I flip the entire layout and have the mount and o ring against the manifold?

Thanks

carlo rossi

between the carb and the ext tube is where the o ring goes
current cars
red 83 gtv 2.0


previous cars
Red 76 1.2/1.5 alfasud ti
white 79 alfetta 2000
alfetta 74 1.8
escort Lotus twin cam
bikes
ducati 900 ss 1979
moto morini 3 1/2 sport 1975/6
Moto morini 3 1/2 valentini speciale 77 oh and a deltek rockhopper

lhodgo

Hang on the top outlet or the bottom outlet in my photo? See how I've got two options in the image?

carlo rossi

generally its right between the carby and the manifold or the adapter
thats if i understand the question
current cars
red 83 gtv 2.0


previous cars
Red 76 1.2/1.5 alfasud ti
white 79 alfetta 2000
alfetta 74 1.8
escort Lotus twin cam
bikes
ducati 900 ss 1979
moto morini 3 1/2 sport 1975/6
Moto morini 3 1/2 valentini speciale 77 oh and a deltek rockhopper

lhodgo

My carbi mounts have a rubber 'o' ring on ONE side only. I'm trying to work out if the rubber 'o' ring pushes up against the carbi or against the 50mm extensions I've also added. Or are you saying I should have the 50mm extensions against the carbi, then the 'o' ring side of the aluminium mount facing the manifold?

If you look at the photo,  the top outlet has the o ring facing the carbi with the lower outlet facing the 50mm extensions.

Trying to work out which is the correct option in that photo.

Thanks.

lhodgo

I've circled the o rings in red

LaStregaNera

Standard practice is to have the o-ring against the carb.
66 GT Veloce
Bimota SB6

Craig_m67

There's a lot of discussion on the AlfaBB (US) about the correct way to install aluminium carb mounts (vs rubber), and any issues that people then solved etc..

I've not installed them on either of my 105 Nords so have no experience to offer.

I only chime in as I remember it being very topical at one stage and I was considering it - in the end i did nothing, just drive  :)
(perhaps when the original [Pirelli?] rubber mounts were unobtanium)
'66 Duetto (lacework of doom)
'73 1600 GT Junior (ensconced)
'03 156 1.9JTD Sportwagon (daily driver)

bonno

Straight from the horses mouth regarding o-ring position relative to carby and manifold (eliminate vibration between engine and carburettor/s). Find attached link to the weber website on soft mount kit.
https://www.weberperformance.com.au/index.php?cPath=115_101

carlo rossi

the top circle
immediatley after the carby either will do
but both the same is ideal
current cars
red 83 gtv 2.0


previous cars
Red 76 1.2/1.5 alfasud ti
white 79 alfetta 2000
alfetta 74 1.8
escort Lotus twin cam
bikes
ducati 900 ss 1979
moto morini 3 1/2 sport 1975/6
Moto morini 3 1/2 valentini speciale 77 oh and a deltek rockhopper

lhodgo

Awesome guys, thanks heaps!!!