[alfajohn]

In a 2lit engine with spica fi i was considering converting it to web. Carbs. My questions is it better to use the rubber
block attachments from the manifold to the carbs or use the metal rigid connectors the rubber flex wit the engine movement but they can develop cracks and mess up the tuning and need replacement. What are your thoughts on
advantages and disadvantages over one or the other which way would you go many thanks on your input john

 

[gprocket]

There are some good and recent discussions regarding hard mounts. Do a search and you'll find them.

Personally I prefer hard mounts but I would also replace the spica intake with a euro unit as well as the peddle linkage.

 

[Lokki]

Here is Alfaholics' take on the subject:

Alfaholics aluminium carburettor mounts

Over time, the original rubber mounts crack and leak air causing the mixture to weaken and consequently the engine to run roughly. Even the replacement reproduction rubber mounts have been known to crack prematurely and this has led us to manufacture these superb billet aluminium items for use as a direct replacement. They use premium quality rubber ‘O’ rings to form a perfect seal between the mount and the carburettor. These rubber ‘O’ rings, together with thackery washers (included in the kit), provide each carburettor with the necessary damping from engine vibrations. This ‘O’ ring set up is used widely for racing as it is considered to be the most effective and reliable method of carburettor mounting. The kit is supplied complete with studs pre-fitted in the mounts, ‘O’ rings, thackery washers and nyloc nuts. These are available in both 40mm and 45mm versions.*

NOTE: Alfaholics is selling these beautiful CNC mounts and therefore all superlatives should be discounted according, but the basic argument remains valid

Having said that, on my car I use the siamesed center rubber mount with the support rod. This ties the two carbs together and helps with both supporting them and keeping them from vibrating. Of course two single throat mounts are also needed. I've had no problems but mine are only a few years old and car really sees only fairly light use.

Double Carburettor Mount - 40mm

Carburettor rubber mounts - 40mm

i'll also that I agree with gpsprocket - don't even bother with the SPICA-manifold-to-Weber conversion kit. My car came with one and it never ran right until I dumped it for a full-Euro set-up.

Finally, if you already have a SPICA unit, it's not going to save money to properly convert to Webers. You can get a Wes Ingram SPICA rebuilt for less than the cost of properly converting.

 

[alfaparticle]

I have recently switched from rubber to aluminum mounts. They both work well but there are suggestions that the currently available rubber mounts are not as good as the older Pirelli's. I think that my Webers are getting hotter with the aluminum mounts.

 

[GTA R]

Changed to AL2 mounts on my last 105, also fitted them to latest Lightweight car. No problems whatsoever on either car. Fit properly and forget.
No competition for me, metal every time.

Steve