Marelli electricals for twin carb

[Paolobuchberger]

Hello All,

Now that my twin carb conversion for my Sprint is running, I wondered if anyone has a working set of coil/distributor for a twin carb or know where I can get them. I'm running the Bosch electricals from my single carb motor with a eletronic ignition kit in the distributor (put in many years ago).

I know their are pro's and cons on Marelli v Bosch but I'm told the Marelli would give it a bit better performance.

regards

Paolo

[AllthingsZagato]

I have never found any difference between Marelli & Bosch, other than reliability...........

[lenus]

How did you do the single carb to twin carb conversion ?

Did you just bolt the twin carbs to the single carb heads, or did you change the heads too?

I'd be doing other things before I started looking at ignition for more power in the case of the former, I've used both and I've really noticed no difference at all, except the Marelli seemed to devour leads quicker.

Electronic Ignition is all the same stuff really I thought, when it comes to performance at least and without going to coil packs and management.

lenus.

[87Sprint]

i cant tell you from experience that you have the best setup - bosch from the sud converted to electronic is the best - thats what my mechanic recomended and once i had done it my sprint it ran much better than with the marrelli....

just leave it imho

[Paolobuchberger]

OK good advice. I'll leave it be. I'm told the dustributor can be checked and overhauled if necessary. Its running pretty well for a brand new rebuild only done about 200 k's and hasn't had a proper full tune yet. It does seem to miss slightly over 4000 k's, but we'll iron that out.

I shouldn't have said "conversion". I put a whole twin carb engine in. As far as I know you can't just bolt the twins to single carb heads.

Paolo

[AllthingsZagato]

Correct, the ports are different along with all the manifolding. You can though fit twin carb head assemblies to a single carb cylinder block.

[Spooty22]

I prefer the Bosch, though for a twin carb they are much harder to come by.

If you have a 78kw twin carb 1.5, try and get a distributor from the same model as they had different timing curves than the single carb and 70kw motors. (More aggressive)