Fiat Twin Cam on Bike Carbs
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  1. #1
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    Rockabilly Boy is offline

    Fiat Twin Cam on Bike Carbs

    Started this as a new thread - following my issues with ignition and then finding a carb issue I'm looking at outing the twin 45's and replacing with a set of bike carbs. I think I much prefer a set of bike carbs as I've played with these a lot more, having run my 1800 Zetec lump on a set of GSXR600 carbs for years. Never went off the boil or needed fiddling with! So Has anybody any experience of Bike Carbs on a 2ltr Twincam -if so what carb set did you use and roughly what size main and pilots did you run? (Just gives me a starting point) Not sure if anyone supplies an inlet manifold as standard for one, if so that will dictate choice of carbs. Any tips gratefully received!!

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    Look forward to hearing what results you get as I've got a Fiat TC in a minor that could do with better carburation than stock. As stock, there always seems to be flatspots and off idle hesitation with these engines, and I thought a pair of dellortos may solve it, but as engine is out the car just now, will be a longer term project. Best carburation on a Fiat was the twin downdrafts fitted to the 1600's, but these will be like hen's teeth. I'm sure Bogg brothers will do an intake though.

    Pete

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    4potHemi is online now
    The twin downdraught Solexes did give plenty of oomph on my 1608cc 124 Sport, but with an attendant 16mpg! If you should find a pair of these carbs and manifold be careful as Fiat in their wisdom made the later engine with a totally different block and head and the bits aren't interchangeable even though they look superficially the same. The chap to talk to is Guy Croft (Googlable) who's spent a lifetime tuning these engines.

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  6. #4
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    Update 1 Bogg bros will do a manifold for the Fiat TC cost £243 inc VAT, just let them know what carbs you're using. Looking for a set of either 38mm or 40mm carbs at the moment. Have got the Webers sorted a couple of O rings had perished got them replaced and things are better, although just waiting for them to go out of tune again!. Guy Croft very knowledgable but seems to want £35 just to join his forum, his book on tuning these motors is over £100.
    Got a local guy who has said he'll be able to fabricate a manifold as well so see what he will charge. Will update once I have the carbs etc, should be pretty straightforward. Not expecting any big gains in the horses as already on Webers. Just it shouldbe a lot more stable.

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    That's not a bad price. I also thought of a pair of SU's as i've got a pair of 1 3/4's from a tuned MGB engine I used years ago. i presume Bogg brothers would do an intake for them too.

    Pete

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    stonefree is offline
    I used 40 Dellortos on a 2ltr twin cam in a Sunbeam on Mangoletsi inlet, worked far better than the DCOEs

    Might I suggest that you change the 45s to 40s as It could be overcarbed
    I got the carbs from Robin Chan at Contact Developments in Reading I don't know if the firm is still there.
    There was another firm in London ..........FSE (Fuel System Enterprises)

    Middle Barton Garage do Abath type stuff
    Probably that's all useless information

  9. #7
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    An update on the bike carbs - had an issue with the local guy fabricating the manifold, but company called pepper performance are making me a kit should be with me next week (sub £100!). I've now got a set of ZX6R carbs and jetted them up to roughly where I had the Zetec on the same size carbs. 155 mains and 20 pilots. Reason I went with these carbs are there are 3 bikes that although have different setups the spacing is identical so if I need to replace then I have a choice of 3. Carbs are 38mm Further update once we have the manifold on and the carbs on

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