MG T-ABC

Intrigued as to why the rocker cover breather is only connected to the front carb on a td/tf? Wont any oil that does find its way into said pipe affect carbs performance?

It was common practice on many cars of the era. On M.G.s it was used through early MGB. I think the amount of oil vapor getting into the air filter is pretty minimal.

As Steve says, it was quite common practice - e.g.Porsche 912 - but I have never understood it. Although the amount of oil should be small it is still blow-by - combustion products. It will surely reduce the amount of oxygen in the inlet air on that carburettor.

O.K. so this is my problem. According to local MG specialist when fitting the rear crank modification the 1250cc engine appears to have had a major overhaul from crank up. The bores viewed with my camera still have the bore marks indicating recent attention. Virtually no carbon deposit on the piston tops. The problem I`m having is that the "breather " referred to above is sending a good deal of oil into the front carb air filter. So much so that after a shortish journey (10 miles) it`s dripping from the bottom of the air filter cover. Carbs rebuilt and problem was noticed before doing so. Where would you start looking. I`m thinking a pressurized rocker cover but if so why? Any advice or help appreciated.

It may be a simple case of the rings not being seated yet. They will seal better once the car has been driven a bit. Also ensure the crankcase breather is unobstructed.

Seat rings with regular motor oil in the engine. Not synthetic.