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Cam degree

Cómo graduar una leva

Módulo correspondiente: Fundamentos del árbol de levas > ¿Qué es la gradación de un árbol de levas?

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Hi my name is Carlos i have a built b16a3 it has je 9.0.1 pistons eagle rods and I have 176-T kelford cams the cylinder head and deck of block has been milled i am using a 40thou cometichead gasket.so from what I learned on the video is that the milling has retarded my timing.i used a degree wheel with piston stopper to find true tdc and it came out perfect true tdc spot on.I set my valve lash to 0.3mm and i start doing my cam degree at 1.00mm in order to achieve my ivo 19 degree BTDC and 55 degree ivc ABDC i had to retard my intake cam by 6 1/2 lines that is a 1 degree at cam 2 at crankshaft so that gave me 13 1/2 degree retard at crankshaft is that normal please help me i dont wanna destroy my engine. The engine spins with no problem its not binding no valve to valve contact no valve to piston contact.i just think that the cams are to retarded but that was the only way to achieve ivo and ivc.i also did math to find my duration using the 180 degree method that gave me my 108 center line is dont know if that is the right way to do it if im using 1.00mm dial indicator

The 0 indicators on the cam gears are in a perfect world a 0 deg mark. Block deck height, Cyinder head height, Headasket thickness, Tolerance in the timing belt, tolerance in the cams and tolerance in the cam gears all play a factor in the physical camshaft position. Realistically, the timing marks on the cam pulley only indicate 0 on the gear and offer no indication of the cams' actual positions.

The point of degreeing the cams is to confirm and correct the physical locations of the camshafts relative to the crankshaft/engine cycle. Once degreeing is complete, the indications on the cam gears should be referenced as the correct zero locations.

Regarding your specific engine, I would double- and triple-check that everything is correct. If possible, confirm TDC using two methods. Confirm intake and exhaust centerlines. Adjust the cam gears to match your cam card specs. Write down the actual numbers for the specific locations on a piece of paper. Take pictures of the actual marks.

This is a very mechanical process and values should not change from what they were adjusted to. If they do change, it indicates an error in your process or measuring methods. For example, if you advance a cam 2deg on the gear, this should only equate to 4 degrees on the crank. If 2deg on the cam results in 6 degrees on the crank, this should raise red flags.

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