injection to carbs conversion - Alfa Romeo Forum
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(Post Link) post #1 of 19 Old 26-05-12 Thread Starter
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injection to carbs conversion

Hi lads, has anybody here converted a 2 litre TS from injection to carbs or does anybody know anybody who has done it? I would be very interested in any info you all might have on that.
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Give Alfaholics a call they should be able to help.

Last edited by 00Alfa Andy; 09-02-13 at 19:23.
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or bike carbs or throttle bodies
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im in Ireland and dont have the money to fork out on expensive conversions, Im planning to do as much if not all myself with the help offriends, Im hoping my only cost will be parts.
Can you tell me more about bike carbs? I have heard about that before.........
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Bike carbs can be a relatively cheap option especially as a good set of Webbers or Dellortos are now getting very expensive and service parts aren't cheap either.

As a lot of big bikes (1,000cc +) red line at anywhere between 11 and 13,000 rpm so don't worry too much about getting enough air through them - they flow well.
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but i would have thought bikes would be using electronic injection and not carbs?
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They do but plenty were still using carbs late 90s even early 00s.

See this link for a cheap set on ebay:-

http://www.ebay.co.uk/itm/Suzuki-120...item4ab809c9a3
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Find a bike with similar power and the carbs should cope with the air flow.

Here is a set off a ZX10 for sale in Ireland. The ZX10 made about 140bhp at 10,000rpm IIRC

http://www.ebay.co.uk/itm/KAWASAKI-Z...item19ca5dc7f2
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holy cow batman they are cheap. But is the manifold the same size or do I need some sort of modification?
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Don't know for the 155. Possibly lots of mods as bike engines tend to be very compact so the carb centres are smaller than equivalent car engines. Then you will need to figure how to feed them with cool filtered air. Mods to throttle cable and a choke linkage of some description. There's a novelty after injection a manual enrichment device = choke!

Yamaha FZR carbs

http://www.ebay.co.uk/itm/YAMAHA-FZR...item3cc6a1fb6e
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Bike carbs are relatively cheap because bikes with carbs are a thing of the past and fast bikes get crashed and trashed so there isn't a big market for them.

Maybe buy them all up and save them for 20 years and they will have real value!
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cheers for the input, its defo the cheaper option but would prob need more tweaking and alteration. Still though once the manifold fits then the rest would be fairly straight forward
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For bike carb manifolds, etc try these guys as they are well known for making these up.

Bogg Brothers fabrication

For the alfa 75 engine carb inlet manifold, Adie Hawkins made the originals and was doing it long before alfaholics got involved heavily in the twinspark conversion scene.

AH Motorsports

all sorts of nice stuff there
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spoke to a mechanic friend who is very experienced with 75s and gtv's. He says there is no performance gain to be had by converting to carbs unless you do engine mods while ur at it such as upgraded cams and pistons etc. so I'm gonna drop the idea of a carb conversion until such time as i decide to do those upgrades, all in I dont have the cash at the mo.
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A carb conversion would cost you a fortune in fuel too. Expect 20-25 mpg maximum, and you'd need a custom manifold and air box sorting out, and then change the fuel pump to reduce the system pressure from about 5 bar to 5 psi (about 0.3 bar).

I don't know if you have emissions tests as part of the NCT in Ireland, but over here you'd really struggle to pass the MOT requirements with a carb conversion.
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Quote:
Originally Posted by kandlbarrett View Post
FZR uses a downdraft carb setup, which would probably make them unsuitable to go onto a 75 TS head

All the best

Keith
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I have a GTV (1998 2.0 Twin Spark P1 Engine) did anyone ever get round to seeing if this was possible?

Ollie
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Yes - quite possible. Why do you want to do it? As above the carbs are still cheap but a lot of mods to do and MOT emissions may be difficult as the lamda sensor has nothing to feedback to and control.
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