Michael,
AUD493 carbs (the R stands for rear) were standard on a 1972 MGB MkII (USA)
-- 1798 cc engine. The standard needle was CUD 1018, piston springs AUC
4387 and WZX 1454/55 jets.
Best regards,
Ed Hamilton
Michael Thomas wrote:
> Sounds like the concensous is that the carbs are HIF4's. The only
> labelling on them shows: "AUD493R" on the small tags bolted to the
> dashpot, "PDC 1" cast on one of the sides of the body, and "SU
> Carburretter Co., Birmingham" on the bottom. The bore size is 1-1/2"
> and they are currently mounted to a British Leyland manifold that is a
> perfect fit to the 1500 engine.
>
> Does anyone have any way of verifying the model numbers? Are they maybe
> off of an MG Midget (since they have the 1500 engine)?
>
> I will do my best in minimizing problems with the emissions plumbing. I
> don't know how soon emission testing is starting here in Ontario, so I
> hope that all this work will not make the car too dirty. The only thing
> I have heard about testing is that there is a 25 year old limit on when
> cars are above the law, so I hope that I can be safe for a few years...
>
> The engine is almost running: I haven't got the choke hooked up, but
> the engine caught with me holding the choke open manually, but the revs
> got up to high. Little bit of adjustment and making sure everything is
> hooked up properly and away I go! Of course, I have to try to get ahold
> of information on the proper tuning of the carbs to get it running
> perfectly...
>
> Thanks for everybody's help!
>
> Mike.
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