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Old 08-28-2005, 14:38   #1 (permalink)
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valve spring different install height

my intake valve install height on my cj 4v head is 1.875
the exhaust is 1.820
has anyone experienced this before
the springs i have are set up for 1.875
and i have another set of springs set for 1.820
can you put different springs on intake and exhaust? the heavier one would go on the intakes
or would this throw balance of somehow?
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Old 08-28-2005, 16:11   #2 (permalink)
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Re: valve spring different install height

Quote:
Originally Posted by musclemustang8
my intake valve install height on my cj 4v head is 1.875
the exhaust is 1.820
has anyone experienced this before
the springs i have are set up for 1.875
and i have another set of springs set for 1.820
can you put different springs on intake and exhaust? the heavier one would go on the intakes
or would this throw balance of somehow?
I would dissregard what it came with and set it up correct, if you are changing to this bigger cam. Like i mentioned a while ago, the exhaust usually has larger lift than the intake, so i can't see why it would need that much extra spring pressure, especially being a lighter valve and all. I usually set up the intake and exhaust the same.
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Old 08-28-2005, 17:09   #3 (permalink)
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Re: valve spring different install height

well the problem being is that intake springs when installed have a height of 1.875 which is what my springs call for, so we are ok there
but when installed the exhaust springs measure out at 1.820 (no shims no obstruction same retainer) the seat is different.
which is going to be too much seat pressure using the same springs as on the intakes. also it will definetly have coil bind issues.
the other springs i have a suggested installed height of 1.820

spring #1 (intake)145lbs @ 1.875 spring #2 (possible exhaust)120lbs @1.820
410lbs @ 1.250 340lbs @ 1.200

so could i run spring #1 on the intakes and run spring #2 on the exhausts?
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Old 08-28-2005, 19:11   #4 (permalink)
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Re: valve spring different install height

Why not use offset collets?
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Old 08-29-2005, 15:58   #5 (permalink)
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Re: valve spring different install height

well i thought of that aswell but i just wanted to know if it would be ok to try. seems it would make sense to me to have a stronger spring on the intake since its larger and the duration and lift are matched on my camshaft. i just wanted to try it since i had it. i want to use the better springs but i cannot on the exhaust without different collets but i can use the other springs without problem except they are weaker. simple enough i just wante dto know if it was ok to try it
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Old 08-31-2005, 18:59   #6 (permalink)
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Re: valve spring different install height

Quote:
Originally Posted by musclemustang8
my intake valve install height on my cj 4v head is 1.875
the exhaust is 1.820
has anyone experienced this before
the springs i have are set up for 1.875
and i have another set of springs set for 1.820
can you put different springs on intake and exhaust? the heavier one would go on the intakes
or would this throw balance of somehow?
.
The reason the intake is higher is that it has factory offset retainers(.060"),so you can shim the intakes or fit a set of aftermarket retainers
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