Sir:

Toyota's 2T and 2T-G engines were a family of 4-cylinder, in-line, 1600 cc, over-square (bore larger than stroke) engines available as standard (as the 2T) and semi-race (as the 2T-G) form.

They featured deeply hemispherical combustion chambers with very large valves - inclined to near 90 degrees of included angle, near to centrally-located spark plugs and domed pistons with large valve reliefs cut into them.

They had relatively high compression ratios for their time (8.5 to 9 : 1) and 5 main-bearing engine blocks, the standard forged crankshafts had 4 counterweights on them and the racing ones 8.

The 2T had a single downdraft carburetor and actuated it's valves via a camshaft mounted high in the block driving the valves through a set of very short and inclined push rods - a unique solution reflecting the designer's inexperience with overhead camshaft designs.

The later 2T-G design was a dual overhead camshaft design, but with only 8 valves - 4 intake and 4 exhaust in an aluminum cylinder head, (called the Yamaha head).

This reflected Toyota Racing Developments' dependence on the Yamaha motorcycle division for racing technology at the time.

It had a pair of twin side draft carburetors, (usually Mikuni Solex).

Neither of these engines was really designed for fuel economy of good drive ability, they were intended for use in Toyota's sport and racing cars of the era.

Hope this helps,

Best Regards,

Dusky Lim