valve springs
10-14-2019, 05:08 AM
#1
TECH Enthusiast
Thread Starter
valve springs guys i wanted to know when running a cam in the 600-630 lift range is this good for a daily driver and how many miles are you getting on the vale springs before your having to change them
10-15-2019, 11:49 AM
#3
TECH Senior Member
Which rocker arms? If stock, that lift is the ragged edge of the upper limit on those.
10-15-2019, 12:23 PM
#4
Get with a cam grinder like TSP or Cam motion and let them know it will be a daily driver and they can use a lobe that will be a little softer on the spring.
I don't have a specific answer to your question and I have looked for answers on that before. Problem is it will range depending on how it's built and driven.
It's a bit counter intuitive but high lift lobes are a bit softer on springs than low lift. The arch is a bit smoother with the higher lift. I've been in automotive and performance for over 20 years and was just enlightened on that a couple of weeks ago.. However I would still probably look for lift between 600-6.10, 6.30 is a bit much for a non roller tip. But that's me assuming you're using stock. Which brings rockers into the conversation, those have an effect on springs too, if they are heavier over the nose that also adds work to the springs.
I don't have a specific answer to your question and I have looked for answers on that before. Problem is it will range depending on how it's built and driven.
It's a bit counter intuitive but high lift lobes are a bit softer on springs than low lift. The arch is a bit smoother with the higher lift. I've been in automotive and performance for over 20 years and was just enlightened on that a couple of weeks ago.. However I would still probably look for lift between 600-6.10, 6.30 is a bit much for a non roller tip. But that's me assuming you're using stock. Which brings rockers into the conversation, those have an effect on springs too, if they are heavier over the nose that also adds work to the springs.
10-15-2019, 02:46 PM
#5
ModSquad
iTrader: (6)
Lots of variables involved here to give an answer...
single springs vs. duals, camshaft lobe family, camshaft duration, driving style, among other things will make a difference.
I honestly don’t put enough miles on my built stuff to give you an answer, but I’m sure lots of guys here have thrown a .600+ lift camshaft in an engine with matched springs and drove it for thousands and thousands of miles without issue. Hopefully someone with personal experience will chime in here.
single springs vs. duals, camshaft lobe family, camshaft duration, driving style, among other things will make a difference.
I honestly don’t put enough miles on my built stuff to give you an answer, but I’m sure lots of guys here have thrown a .600+ lift camshaft in an engine with matched springs and drove it for thousands and thousands of miles without issue. Hopefully someone with personal experience will chime in here.
10-16-2019, 06:34 AM
#6
TECH Enthusiast
Thread Starter
Stock rocker arm with trunion kit for cath port head.havent decided on springs but i guess whatever cam calls for.its a few cams thats in the 5.50 lift range that i can run with the z06 springs but i wanted a little more lift to work the heads better.
10-16-2019, 06:43 AM
#7
ModSquad
iTrader: (6)
Talk to your camshaft supplier when you make the purchase about valve spring life expectancy. They would know from testing, better than most here. It’s a good idea to purchase cam and springs as a matched set from same supplier.
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10-16-2019, 07:00 AM
#8
Most stock heads, in stock condition, don't flow much more at super high lifts; at some point, the valve opening becomes so large, that it's no longer "The Restriction". Of course the valves spend only a very small part of the time at that "peak" lift, anyway; most of the time they're at MUCH lower lift, even if the cam has GIANT peak #s.
For a daily driver that's not an all-out effort, there's no usually a whole lot of difference between .550" and .600" of lift. Now if other things are optimized - CNC head porting, other intakes, etc. - that changes. But if you get up anywhere near .600" peak lift you've pretty much maxed out stock heads and there's little point in going much farther.
For a daily driver that's not an all-out effort, there's no usually a whole lot of difference between .550" and .600" of lift. Now if other things are optimized - CNC head porting, other intakes, etc. - that changes. But if you get up anywhere near .600" peak lift you've pretty much maxed out stock heads and there's little point in going much farther.
