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Before You Begin:

It?s no secret that Carbs sound the business and also increase power considerably too. They?re an old technology, but if it ain?t broke, don?t fix it as the old saying goes. Not only do they chuck enough fuel/air mixture into the engine to run Chernobyl, they sound awesome as well. The following article was pinched from REV?s magazine, so thanks to them. The article was based on the great blokes from Aldon Automotive in the West Midlands who are bloody experts in this conversion.

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Tool Up:

If you?re contemplating doing this conversion yourself, then get tooled up first. There?s nothing worse than getting halfway through a job only to realize that your missing something.

1)      Socket Set.

2)      Spanners.

3)      Stanley Knife.

4)      Screwdrivers.

5)      Drill.

6)      Nuts & Bolts.

7)      Extra Vacuum Hose.

8)      Cooling Fan.

Changing to twin carbs from fuel injection isn?t as hard as you may first think. Removing the standard fuel injection setup isn?t hard at all. Just be clear and remember where everything went, in other, don?t rush the job. Don?t expect to finish this in a single day. Even Aldon had this particular car for two days to finish the job properly. Let?s begin and good luck.

1. Work out what everything is and remove the whole mechanical fuel injection system. It?s all simple workshop-manual stuff, but be sure not to tear hoses when you take them off.

2. Strip all the other bits necessary to provide you with easy access ? including radiator, fan, top hose and scuttle panel. Keep in a safe place as you?ll need these again later.

3. Grab your new inlet manifold and gasket set, and then fit them to the cylinder head. On some cars it?ll be necessary to file the casting in places to ensure a perfect fit.

4. Lubricate your new ?O? ring with grease or WD40. This improves the seal and means they?ll stick and stretch when the engines running. Plop them on to the manifold.

5. Attach your ready-assembled carbs to the inlet manifold. Don?t bolt them up solid because you need a little movement on the ?O? rings to stop fuelling problems.

6. Replace your radiator hose. The standard one will fit but you may or may not need a longer one due to whatever car your doing this conversion on.

 

7. Because your original throttle cable may come in at the wrong side, you?ll need to re-route it. Start by drilling a new hole in the bulkhead and inserting a grommet to avoid chafing.

8. Chop the end of the cable and attach it to the Weber throttle linkage using the supplied solderless nipple. Get someone to press the accelerator to check it?s opening full throttle.

9. Drill a couple of mounting holes in the inner wing for the fuel pressure regulator. This drops pressure from 60 to 5psi and save replacing the fuel pump.

 

13. The vacuum hose will need extending. Use a flexible piece of pipe about ? inch in diameter. Connect it from the servo to the inlet manifold.

 

10. Bolt the regulator to the wing then connect the tanks fuel line to the inlet and the outlet to the carb with rubber fuel line.

 

14. Re-fit the radiator and get a new fan if your existing one catches on the filters. Go for a Kenlowe electric for ?80, otherwise use a slim one from another car.

11. Grab your trumpets (ohh err) and slide them onto the carbs. On some cars clearance will be tight, but try and use the longest possible trumpets. Tighten them down with the 8 mounting nuts.

 

15. Webers come ready-to-run from the box, but need setting up on a rolling road for best results. Fuel jets, air jets and idle jets all need matching to your engine spec.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Verdict:

Well, do they work. Yes. On a standard Mi16 motor you?ll be looking at between 8-12bhp increase with more torque and an engine that sounds like it?s going to bust through the bonnet. It should pull a lot stronger all the way through the rev range due to more fuel being pumped through the system. Get some head and Cam work done and you?ll be laughing. Don?t worry about fuel economy by the way. If you drive sensibly then you?ll get a nice return. Drive like a bad boy? I think we all know the answer there!!! Oh behavvvvveeeee!!!!!!!!!!!!!!!!