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Valve Timing


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Im doing a RB25/30 conversion. Wondering if anyone knows anything about Valve timing. Im using RB25DE camshafts. So what would be valve timing:

Inlet Opens.......????BTDC

Inlet Closes.......????ABDC

Exhaust Opens..????BBDC

Exhaust Closes..????ATDC

This will be a check after its all lined up

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i think daikin makes a belt for the RB30/25 conversion. Simply you should be able to line the dots up on the belt and the crank shaft gear and the dots on the cam gears. Looking at the cams the inlet lobe should be around 10 o'clock and the exhaust around 3 o'clock.

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Ive got the belt, there's no marks on the belt, and if there waz it would be for another car, the timings anit the same in all cars. I have to set the timing for a 3litre turbo. Obviouslly i cant find that out for my conversion, but if i can find the factory timing setings for a GTR or supra, or maybe the VG30DET, these will give me a good indication on what they have to be. Proberly be in a workshop maunal.

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The way I do it is to set the cams up with standard timing as per the crankshaft pulley and the camshaft marks. Then I change it on the dyno with the adj pulleys. I really couldn't give a rats what the timing starts off at. I simply mark the settings with a white paint pen or a pin punch. If I pull it apart for any reason, I just line the marks back up again.

Measuring the base camshaft timing with a degree wheel and a dial gauge is not something I enjoy, it takes me longer (I am very slow) than tuning it on the dyno. So I don't bother anymore, it's a waste of my time.

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With No.1 piston at TDC, the keyway in the crank will be at 12 o'clock. If you put the timing pulley on, it has a punch mark on it which will line up with the notch on the oil pump housing. Line up the cam pulleys with the marks on the rear cover, and put the belt on.

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