I have done some searches and have some questions (for the sake of discussion, limited to n/a engines in a street Chevelle):
I know that I can simply try all the springs in a given kit and find the one that works best. I would like to see if I can be a little less random about it with your help. Not only does this help me understand why a spring works, but helps me understand which way to change during future modifications like a cam swap, gear swap or whatever.
Left to Right
(lightest to heaviest springs):
White, Yellow, cut Yellow (upsidedown), Purple, plain, Brown, Black.
Based on the picture, do I have that right? The brown and black were hard for me to to tell which was which.
Despite the differences in spring free height, the wire diameter and coil pitch are more particularly what drives the spring rate as I understand it.
So the real questions here:
Is there a generic rule about where to start with spring selection (such as heavy cars start with black and work backward)? Or are there too many factors to make some generic rules?
Some guiding questions to help answer the above question:
I would assume cam selection makes a big difference for vacuum signal, right? Lower engine vacuum needs a lighter spring?
All else equal (manifold vacuum, gearing etc.), does engine displacement
affect the needed spring?
I understand that rear gearing can impact the needed pump shot on the secondaries of a double pumper. Does gearing impact vac secondaries?
Changing from a stock snorkel/paper filter to a open element K&N or equiv filter would impact the signal too I think, which way (confusing posts in the search on this)?
I am happy to hear your experience, particularily if you can tell me why something worked, so I understand better.
Thanks for your time,