I was checking the max lift vs coil bind specs for a variety of dual springs (PAC, Manley, Isky) and quite a few of the dual w/ damper springs had max lift ratings that were .100"+ from coil bind. However, some of the dual w/ damper springs were spec'd down in the .050-.060" clearance range, and all of the duals w/o dampers were as I recall.
It gave me the impression that having a damper -- although it has its drawbacks -- makes the distance to coil bind less critical. True? Or is my observation more likely to be applicable to certain springs & applications?
Thx - Brad
Are valve springs w/ dampers less senstive to clearance from coil bind at max lift?
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Re: Are valve springs w/ dampers less senstive to clearance from coil bind at max lift?
Noticed something along these lines as well. Interested in the responses.
Re: Are valve springs w/ dampers less senstive to clearance from coil bind at max lift?
Brad....... just pull out the stops and go for the dual conicals.
Somewhat handy with a die grinder.
Re: Are valve springs w/ dampers less senstive to clearance from coil bind at max lift?
I thought about that seriously... right before the killer deal came up on the Isky/PSI dual w/damper spring sets.
Got into multiple sets of Isky's and the rest of the hardware to run 'em for less than the dual conical springs < drool > alone.
IIWII... now I just want to know what makes sense for setting up the installed height after I verify the net loaded lift.
Re: Are valve springs w/ dampers less senstive to clearance from coil bind at max lift?
Bump 'cuz I'm still hoping to get some feedback on this. I got a set of heads to assemble this weekend...
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Re: Are valve springs w/ dampers less senstive to clearance from coil bind at max lift?
Personally I refer a taller spring to get decent clearance between the coils.
Springs do funny things when the rpm is in the upper ranges like over 5500 to 8500 and I have seen evidence of a wave action in the coils where they would rub at tighter clearance causing breakage making a good day go bad fast.
I have used Isky springs for over 30 yrs and never broke any to date but have seen other brands break using the same
theory.
I talked to PAC about an issue I had a while back and while they told me to run the spring tighter to solve the issue
with using their spring and run it closer @.050 from coil bind .
Cam profiles can play a big part in valve spring life and when doing a R+D project that can be very informative as you
learn what works and what breaks stuff, just part of the fun
Springs do funny things when the rpm is in the upper ranges like over 5500 to 8500 and I have seen evidence of a wave action in the coils where they would rub at tighter clearance causing breakage making a good day go bad fast.
I have used Isky springs for over 30 yrs and never broke any to date but have seen other brands break using the same
theory.
I talked to PAC about an issue I had a while back and while they told me to run the spring tighter to solve the issue
with using their spring and run it closer @.050 from coil bind .
Cam profiles can play a big part in valve spring life and when doing a R+D project that can be very informative as you
learn what works and what breaks stuff, just part of the fun
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