Race Engine Forum UK

Hello!
Is there a do-it-yourself method for adjusting cam timing on Alfa Romeo 75 2L AR01612 twin-cam carburetted engine, to achieve more torque at the low end?
Carburettors is already fitted with 28mm venturis, and I still hope to improve things a little bit more by reducing overlap.

With out knowing the engine specifics this is one easy way to get more low end power and torque.
Advancing both cams 4 degrees will move the torque curve down in rpm by say 150 - 200 rpm.
Advancing the intake cam alone will enhance cylinder pressures but increase overlap. So moving both will serve the purpose.

The increase in cylinder pressures may increase the engines octane requirements so be mindful of detonation at the existing ignition timing settings

If you alter cam timing it is good practice to recheck valve to piston clearances, and in your case especially the intake as the cam advancing will move the intake valves closer to clashing.

Robert

Thank you for answer, Robert. There's much to think of.