scooter3

So after researching several cam choices I am still wondering why some cams require new springs and others don't. It seems that most, but not all Stage 2 cams require you to replace the stock springs, but most Stage 1 cams do not. I have even looked over cam specs and really can't see what would require the spring change, not that I know what I am looking at. So if someone could school me on why this is and what the specs represent would be great!

nickmckinney

Lift, RPM, and boost level (if any)

Anything over 550 lift and/or 6500RPM needs a new spring with the PI 2V head.

The higher the boost the higher the spring seat pressure needed combined with the above.

rammjett

this MIGHT help you understand camshafts --

---- http://books.google.com/books?id=JV_...page&q&f=false -----

Cam design and manufacture, Volume 1

mrtstang

What are you looking to accomplish op?

scooter3

A reliable, street able car that will give me good power throughout the power band with a noticeable idle. I am not looking at building a race car, just something fun to drive on the street. I really don't want to change the springs if I don't have to. That is why I was confused as to the difference in the stage 1 and stage 2 cams. Some say you HAVE to change the springs others say you don't depending on what stage you go with.

WannaBeGearHead

Modular Head Shops Stage 2 cams would be perfect for you then. Don't need to change the springs, it will have a noticeable idle, no power loss down low and more power in the midrange and top end. mrtstang will you tell he is running them now and loves them.