Race Engine Forum UK

Ok, just looking for some comfirmation on cam timing full lift adjustment with variable cam gears. To advance the intake FL from 110degrees to say 104, rotate the cam(cam gear) clockwise and to adjust the exhaust FL from 110 to 106 rotate the cam anti-clockwise. Correct?

Thanks

Ted

Inlet:

The inlet valve is opening up. If FL is currently 110 deg and you want it at 104 ATDC you would indeed turn the camwheel clockwise to open the valve more, by (110-104)/2 deg = 3 cam deg

Exhaust:

The ex valve is closing. If FL is currently 110 deg BTDC and you want 106 you would turn the camwheel anti-clockwise by 2 cam deg, again to get the valve 'more open'.

Think of it in terms of the valve event at TDC. There the ex valve is closing and the inlet opening up. The closer to TDC the FL event is the more open they will be there.

GC

Thanks Guy, thats just what i was thinking.

Ted

Hello.

Could anyone is so kind and tell me what is advantages of advancing or retarding camshaft?

I am interestin in sohc camshafts.

thanks

Regards