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Thread: Carbs on Fiat engine

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  1. #1 Carbs on Fiat engine 
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    For those who have enquired here are some pics of my setup. Should add that the carbs. are DelOrto DHLA 45's
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    Last edited by h_m_cumming; 04-10-2017 at 08:35 PM. Reason: addition
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  2. #2 Re: Carbs on Fiat engine 
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    Looking great. You back on the road now Hugh?
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  3. #3 Re: Carbs on Fiat engine 
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    I wish. Took a 5thou skim off the head, valves all ground in and assembled, sorting out gaskets. Got to hone the bores and then start fitting pistons.
    I think the reason the piston broke up was because the second ring gap closed up and distorted the ring which broke the lands, despite the fact that I made the gaps larger than recommended, so this time I'm makeing them wider still, I think 22thou. top and 25 second, which are more like a racing engine gaps. Time will tell.
    And then there's all the housework on top!!!!!
    Last edited by h_m_cumming; 04-10-2017 at 09:21 PM. Reason: addition
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  4. #4 Re: Carbs on Fiat engine 
    frequent forum contributor Club Member andyf's Avatar
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    That is the setup I had on the Fiat engine that I had in my rally car. A great engine, not a huge amount of power but very drivable. I loved the sound it used to make at full chat… I did consider swapping the engine into the roadster when I broke up the rally car but decided that it would be too much work…

    Mk2 SWB Marina Roadster with a 2.0L Pinto built in 1986
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  5. #5 Re: Carbs on Fiat engine 
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    I did a fair amount of work on mine and eventually got just short of 150 horses, so happy with that.
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  6. #6 Re: Carbs on Fiat engine 
    frequent forum contributor Club Member element's Avatar
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    Many thanks to Hugh for posting these set up pics above. I too have the Fiat engine in my roadster and I would like to upgrade it to twin carbs. Its a winter/spring project and having dug into the detail I see a stumbling block straightaway. The current single carb fitted is the original one from the original donor '83 Argenta. While it works and the engine runs and it is quick - at higher load it does become starving for air. I tested this theory by comparing driving with the bonnet down and with the bonnet propped open (and tied in place!). When the bonnet is down it gets sucked down against the air filter top.. Originally, I was going to live with it but modify the air filter itself to recieve a cold air feed via a cone filter elsewhere. However, I've decided if I am going to do anything - its better if I do it properly from the start.
    So, the current carb fitted is downdraft & if I put twin Webers on it I'd have to modify the bonnet which I am very reluctant to do. Hugh got around the problem by using a sidedraft inlet manifold and fitting the carbs that way - I think that is the best way to go forward.
    Problem number 1: sourcing a compatible side draft inlet manifold for a 2.0 twin cam... When I google it - I can only find one reference to one that was for sale in Australia in 2016! However, I have found a suggestion on a blog that a company called Mangoletski might make them to order... I found their site and indeed it looks like they can:
    http://www.mangoletsimanifolds.com/manifolds/fiat.html
    However, I'll need to know the precise geometry and bore dimensions to be sure it will fit my engine and I'll also need a twin carb kit that will be compatible and then once I've done as much as I can in the assembly myself, I'll take it to a local tuning specialist with a rolling road set up for them to finish it off for me. I am just about touching the 'intermediate' diy mechanics level and some things I know are beyong my ability.

    However - there is a nagging feeling at the back of my head... A while ago, I think I read somewhere that the Marina rear differential is ok up to about 130hp. Perhaps I also read that the Marina van diff was more capable - but those will be extremely hard to come by these days.. If I am going to upgrade to twin webers with a good air feed my engine will certainly rise up from its standard 112hp... Might I be heading for a fall? Are any of your Roadsters with a Marina diff' coupled to more than 130hp ?

    Thanks for your input!
    Tony
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  7. #7 Re: Carbs on Fiat engine 
    frequent forum contributor Club Member jon_cox's Avatar
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    Hi Tony
    Just a quick reply for now. I too have a fiat twin cam 1800. I have lots of experience and knowledge of the carb situation, both good and bad. Just to say I did have twin downdrafts that fitted nicely under the bonnet with no mods. I don't anymore as they were a pig to keep tuned.
    Have you seen these on eBay. Came off a twinky so are probably set up for your engine. He has the inlet manifold for sale separately as well. http://r.ebay.com/mFRDV9
    Jon
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  8. #8 Re: Carbs on Fiat engine 
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    That's what you want, and the right manifold although I'd use misabs. From experiance the std. marina diff is OK, it's torque not hp., within reason, that it doesn't like. If your upping the power I would regap your rings as I've found to my cost.
    Last edited by h_m_cumming; 11-10-2017 at 03:23 PM. Reason: addition
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  9. #9 Re: Carbs on Fiat engine 
    frequent forum contributor Club Member element's Avatar
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    Aha! Now that's what you call a community! No less than an hour after my post - both Jon & Hugh are there to support the upgrade!
    Thank you Jon for the link and the heads up - I am eyeing the two sales very closely - only snag looks like the dellorto's are manual choke?
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  10. #10 Re: Carbs on Fiat engine 
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    I only use the choke to start when cold but shut it off within 10/15 secs.
    Just looked at the Mangoletsi one, it wont suit your setup as it is not offset for the dist.
    Last edited by h_m_cumming; 11-10-2017 at 06:04 PM.
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