heat cycling new springs
07-11-2005, 06:45 PM
#1
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heat cycling new springs some people say its a waste of time and others say to do it 3 or 4 times. any problems anyoen have after not doing it?
07-11-2005, 06:50 PM
#2
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i did hear of a guy that redlined his car right after a new cam install and i think crane sprinds? and broke a spring right away....
me, i did about 6 heat cycles, each times letting the car get to normal operating temp and then raise my rpm by around 750rpm each time out.....
after 5-6 times i was hitting the rev limiter......
but it's up to you....
me, i did about 6 heat cycles, each times letting the car get to normal operating temp and then raise my rpm by around 750rpm each time out.....
after 5-6 times i was hitting the rev limiter......
but it's up to you....
07-11-2005, 10:00 PM
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Thirty years ago with Vasco Jet springs (also known as H-11 tool steel), enginebuilders would heat the springs to approx 300F in an oven to remove the initial stress imparted by the coiling and heat set operation. This caused the seat pressures to reduce by about 15%. If it wasn't done, the first 6-10 drag passes were inconsistent as seat pressures decreased. The stress removal was to provide consistent performance from the first pass on and had nothing to do with ultimate reliability. H-11 tool steel is not nearly as consistent or reliable as modern "super-clean" extra high tensile, chrome-silicon valve spring wire that is used by everyone in the LS1 market. H-11 springs also had a tendency to break as they aged but this did not have anything to do with the heat cycling. It was a direct result of the chemistry of the steel.
This current idea of heat cycling modern springs made of the extra high tensile chrome silicon wire is the most ridiculous practice I have heard of. No it won't hurt anything but it is a waste of time and perpetuates thirty year old practices that don't accomplish diddly with today's high quality wire. XHT chrome-sil doesn't experience a high initial load loss and it isn't prone to breakage as it ages. It just looses tension and at that point the engine won't rev as high. I know of one prominent spring designer at one of the top spring companies that laughs at this practice every time he reads about it!!!
This current idea of heat cycling modern springs made of the extra high tensile chrome silicon wire is the most ridiculous practice I have heard of. No it won't hurt anything but it is a waste of time and perpetuates thirty year old practices that don't accomplish diddly with today's high quality wire. XHT chrome-sil doesn't experience a high initial load loss and it isn't prone to breakage as it ages. It just looses tension and at that point the engine won't rev as high. I know of one prominent spring designer at one of the top spring companies that laughs at this practice every time he reads about it!!!
07-12-2005, 08:20 AM
#6
I agree with QT. One of Associated Springs guys is a good friend of mine and he also chuckles about this. The key is oil temp. You don't throttle a car to WFO when it has cold oil. Springs like the Patriot, PRC, TEA, AFR, ISKY, COMP, Crane that are made from the "Super Clean" material are ready to run. . .just run them when you have oil temp.
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07-12-2005, 09:17 AM
#9
Originally Posted by Cstraub
Side Step,
Where do you live in the Tri -Cities?
Where do you live in the Tri -Cities?
You ever do any dynoing over at RideRevolution???
07-12-2005, 10:30 AM
#11
Interesting info QuietTahoe......I need a new set of springs soon for my solid roller BBC. It has H-11 springs in it now and I want to replace them with something more 'up to date' if there's better materials available. How do I know if a company like Comp, Manley, PSI, etc are using 'super clean chrome silicon' for the spring I need? The springs I'm using now are 1.625" O.D. duals, 250# seat, 825# open, .825" max. lift.
07-12-2005, 04:37 PM
#12
1Fast,
Most of the New higher dollar springs are made from Super Clean. PSI's founder was instrumental in developing this material so it is my ASSUMPTION that all of their springs are Super Clean. Any company you use should be able to tell you what material it is.
Chris
Most of the New higher dollar springs are made from Super Clean. PSI's founder was instrumental in developing this material so it is my ASSUMPTION that all of their springs are Super Clean. Any company you use should be able to tell you what material it is.
Chris
07-12-2005, 05:34 PM
#13
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Originally Posted by Cstraub
I agree with QT. One of Associated Springs guys is a good friend of mine and he also chuckles about this. The key is oil temp. You don't throttle a car to WFO when it has cold oil. Springs like the Patriot, PRC, TEA, AFR, ISKY, COMP, Crane that are made from the "Super Clean" material are ready to run. . .just run them when you have oil temp.
Ed
07-12-2005, 07:47 PM
#14
. . .. and what springs FTI sells and ET Performance. I will add the addition of Meta-Lax stress relieving will greatly increase spring life for minimal cost. These machines can be found in high end automotive machine shops and companies that due alot of bending and welding.
Chris
Chris
