Originally Posted by Andreas
I am running stock valves intake and exhaust. But I did a few things I have learned from some Nissan development papers I was reading. Which they gained big power by increasing the throat and keeping the valves stock.
Keeping stock valves will actually make them flow great as the valves will be deshrowded from the cylinder walls since we have gone from 86-90mm. If you go to large with the valves you can actually bring the flow down as as the walls will hurt the aior flow.
This was the concept that Nissan did with the N! head where they went with bigger cams but used smaller valves to increas flow. They found that the same size valves as the standard SR16 actually lost HP in the 86 mm bore motor.
I am running stock valves intake and exhaust. But I did a few things I have learned from some Nissan development papers I was reading. Which they gained big power by increasing the throat and keeping the valves stock.
Keeping stock valves will actually make them flow great as the valves will be deshrowded from the cylinder walls since we have gone from 86-90mm. If you go to large with the valves you can actually bring the flow down as as the walls will hurt the aior flow.
This was the concept that Nissan did with the N! head where they went with bigger cams but used smaller valves to increas flow. They found that the same size valves as the standard SR16 actually lost HP in the 86 mm bore motor.
Right ,see Im no pro but he said not to get bigger than +1mm.I never knew that ill read up somemore abut that.