126 Tuning
Messages 1 to 20 of 62.
I thought that we could do with a thread on 'warming up' 126s, both air and water cooled. The air cooled is easy as there are still loads of 'sport' parts available from the specialists and the Stage One mod of bigger carb and sport exhaust is still the best way to start. The water cooled has a lot of potential and it would be nice if everyone shared their mods or even just ideas (see Oildonkey's post in "still oil in sump" re trick exhaust for Bis). Dodo
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we can grab 3rd gear now up a local hill where before it howled in second!.........total cost? £zero :-) these little engines are great,the only reason im going for a swap is that mine is in quite poor condition........and i want to blow my brother into the weeds!!!!
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Interesting, your comment on re-routing the crankcase breather pipe. Have had a bit of bother with condensation milk shake in the filler cap, the gases are then routed from the filler into the air intake and thru the carb, as I had a problem with muck AND water in the carbI also thought I would disconnect that crank breather, now, NO probs, and she is now running as sweet as a nut! Cheers,
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This is my third try to post this message, the computer keeps losing it. Last try the "server was too busy". Third time lucky ? I really like the sound of your brother's 126. Have you thought of changing the carb to get away from those strangling small standard venturis ? I have been told that the Panda 30 version of the Bis 30 DGF has larger venturis and coupled with the Panda camshaft should give more than 30bhp in the Bis engine - if the standard exhaust doesn't strangle it. I am not having any luck with finding a 500Station Wagon Abarth exhaust, so I will try making a free flow exhaust from a couple of 'Cherry Bombs' (see the 126 tuning page on the Blitz Racing site). Another carb to try is the Weber 30 DIC as used on the Fiat 850 Sport Saloon/Coupe/Spyder. The later versions have 23mm venturis in both barrels the same size as the venturis in the standard 652 motor ! As the Bis head has twin inlet ports (like the 30bhp heads), I am going to try twin carbs on a new inlet manifold. Contenders are twin 28 IMBs from the 652, twin Solex 30 PIB4s from the Fiat 850, or as favourite, twin Dellorto 30/24 (or32/28) carbs. I have found one of these Dellortos so far but might never find a second. I have a Nardi cam that I bought more than thirty years ago for my 500 and if it fits the Bis I could fit a 32DCOF twinchoke side draught from a Fiat 124. What air filter is your brother using now ? I was thinking of fitting a K&N universal clamp on rubber neck unit. Have you tried this ? Dodo
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as for carbs etc,we are very limited over here for spare parts,all our old cars get crushed on the day they go to the one dump that we have,i cant find any doner cars for my project,as far as we know,there are 4 bis 126's and one tuned aircooled on the island,all the others are gone :-(
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I've always done this sort of thing on the cheap (...read free) and ingenuity is the order of the day. Are you using the carb inlet cover, or have you just put mesh over the carb body ? When we were starting out on standard 500s, we would leave the angled pipe/carb inlet cover (same as on the A.C. 126s) and stretch a stocking (one leg of a pair of tights now ! lol) from this pipe to the furthest part of the fan housing we could find. This forms a cone of filter mesh that is less restrictive than the small disc of metal mesh. There is not as much room for this under the Bis lid, but it can be done. Have you ever thought of how useful a metal kitchen flower seive can be ? If you hacksaw off the handle, it can be soldered to a flat piece of tin (lid or bottom of an Xmas sweet tin) that has had a hole cut in it to fit the carb inlet. This gives much greater area of filter mesh which can be covered over with 'tights material' for better filtration. Dodo.
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Not what you can call cheap, but when I find something more reasonable I'll post it. Dodo
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Tiffer
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Twin carbs are a (sometimes) cheaper alternative to a synchronised twin barrel carb such as the Weber DCOE. The idea of both systems (in their most efficient form) is to have each cylinder fed from a separate carb barrel. If you look at the 'Nanni Ricambi - Bologna' site at http://www.fiat500sport.com/ then click on the 'Fuel-feed....' title which is third one down in the left hand column, it shows various carb/manifold set-ups, including the DCOE for (very highly tuned) 500s ! Now, if you imagine two separate carbs side by side instead of the single, twin barrel, DCOE, you have 'Twin Carbs'. Unfortunately, the best carbs to use for this are the Dellorto FZD semi-downdraught unit, but you can also see from the Nanni Ricambi site that these are VERY EXPENSIVE. As the 500 head had a single inlet port head, however, the whole point of one carb/barrel per cylinder is lost. That is why people fit the twin inlet port head of the Panda 30 to air cooled engines and why the twin inlet port head of the Bis has the same power potential as the Cinque 700 (also 30BHP). Hope this has made things clearer. Dodo
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Thanks, Kind regards
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Tiffer
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http://www.fiat500sport.com/def.asp?l=ENG&a......;sku=D823766306 Tiffer
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If you want to see a Panda 30 head and read the difficulties in fitting one, go to http://pages.zoom.co.uk/blitz racing/tuning.htm If it fits a 126aircooled, it should fit a 500. Dodo
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SORRY, the last post about the Panda 30 head should have been to you. On the continent they do better than imagining racing 500s. Have a look at http://www.abarth-racing.nl/ and http://www.rossicorse.com/ for racing 500s and 126s. Dodo
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I'm putting these posts out a bit at a time because I'm fed up with writing loads of information and then having it all lost by Preloved telling me they are too busy. A single Dellorto FZD 30/24 (plus a 32/28) is shown on the Nanni Ricambi site on a manifold specifically designed for the STANDARD 500 head. This together with a 'Record Monza' exhaust would be a good 'Stage One' mod for a 500 (although a warmer camshaft would let you get the best out of these bits). They could all be usefully transferred to a 500motor enlarged to 700cc (or more) OR a 126 aircooled unit (652cc or enlarged). Middle Barton Garage have one 30/24 unit left, but I don't know if it comes with a manifold. The FZD 30/24 would probably work OK on the Bis, but it is unlikely to be an improvement over the standard 30DGF twin barrel unit. Dodo
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The head for the 500 with the inlet manifold cast in looks good value doesn't it. A much better bet than the Panda 30 head unless someone you knew was selling one. These heads are, I believe, designed for the Weber 40 DCOE carb and are really for racing (see the abarth-racing.nl site). The DCOEs are now out of production and as they are still sought after they are a bit pricey anyway. The Weber concessioaires (http://www.webcon.co.uk/) have even resorted to making their own version of the DCOE to meet demand. The Dutch cars that use DCOEs for racing look to be producing 40bhp from 700cc and 51bhp from 710cc. Depends how much you want to spend ! That head for the DCOE looks really cool though doesn't it. Dodo
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The Nanni Ricambi site is very nice to drool over, but for something nearer home try http://www.italcorsa.co.uk I found it best to phone them rather than email and they told me that they are going to Italy in June for more stock. It is mostly bought to order too, so start saving up ! lol Dodo
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Only just seen your post. When disconnecting the breather pipe from the air filter case, it is recommended to run the pipe to a 'catch tank' to avoid oil being spread on the road. generally this can be anything from a half litre screw top can (Halfords cellulose thinner tin) to an old windscreen washer bottle (rigid, not the silly bags that the 126 has). I prefer the can as you can solder an inlet pipe and breather pipe onto the top. Specialist air filter suppliers such as K & N also supply filters for the breather side. This might be a good idea with the Bis being a hatch back having the engine 'inside' with the driver ! As the breather connection to the carb is on the carb side of the filter, it will need to be blocked otherwise the carb is being fed with unfiltered air through this hole. I always use a cork and have found that the red rubber ones (beer making ???) are best. Dodo
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Thanks mate....
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Messages 1 to 20 of 62.
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