The Ford Barn - View Single Post - Boring a 125ci AF motor to a 200ci A motor

johnbuckley · 07-03-2013, 03:10 PM

According to one of "our" manuals : bore 3.0552 ,capacity 2043cc=124.6ci. stroke same at 4.25". ring gaps corresponding slightly tighter. Other differences with the 2043cc engine were in the smaller jets and venturi size, and a slightly smaller bore of inlet manifold. As far as I know there were no changes to valvesor cam shaft. To compensate for the lack of grunt the back axle was 4.55:1 . Also the cylinder head was different to give a smaller volume. Have no performance specs, but when in convoy the 2043cc cars keep up OK until it comes to hills . Limeys rarely souped them up at that time; they has Austin 7s to play with. All this research has got me scabbling through old books - Rowdy- I'm wondering if the authorities I've beeen consulting are wrong and that some 3.3 litre engines destined for RHD vehicles were in fact designated AF after all!!

07-03-2013, 03:10 PM	#24
johnbuckley Senior Member Join Date: Jul 2010 Location: United Kingdom Posts: 1,556	Re: Boring a 125ci AF motor to a 200ci A motor According to one of "our" manuals : bore 3.0552 ,capacity 2043cc=124.6ci. stroke same at 4.25". ring gaps corresponding slightly tighter. Other differences with the 2043cc engine were in the smaller jets and venturi size, and a slightly smaller bore of inlet manifold. As far as I know there were no changes to valvesor cam shaft. To compensate for the lack of grunt the back axle was 4.55:1 . Also the cylinder head was different to give a smaller volume. Have no performance specs, but when in convoy the 2043cc cars keep up OK until it comes to hills . Limeys rarely souped them up at that time; they has Austin 7s to play with. All this research has got me scabbling through old books - Rowdy- I'm wondering if the authorities I've beeen consulting are wrong and that some 3.3 litre engines destined for RHD vehicles were in fact designated AF after all!!