Update:
It was brought to my attention by a viewer that camshaft manufacturers give their timing events in terms of tappet lift where I did the measurements in terms of valve lift.
I think they do that because things like rocker arm ratio and valve train geometry will effect the angle reading at a given valve lift and because that is so often different from engine to engine it is better to specify in terms of tappet lift. When tappet lift specs are used it makes it easier to compare one camshaft to another.
The way I measured the events at the valve can be used to compare the two camshafts that I have for this engine but the values would not correlate well to a cam catalogue.
In this video we measure the baseline cam intake and exhaust duration along with valve lift and overlap to better understand the current performance figures.
This information will also put into perspective the dimensions of the cam that is going in next.
13 июн 2024
