Valve spring installed height
02-10-2001, 04:52 PM
#1
TGO Supporter
Thread Starter
Valve spring installed height
how close to hitting the installed height is good enough? i'm going to buy a couple of boxs of shims to keep on hand and the fewer differant sizes i buy the cheaper it is on me. i can always stack shims to get the thickness i want. i was thinking .010 and .020 would get me with in .010 or .005 and .010 would get me with in .005. so how close is close enough? i'm tired of trying to build heads and not having shims.
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ICON Motorsports
1st & 3rd
[This message has been edited by ede (edited February 10, 2001).]
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ICON Motorsports
1st & 3rd
[This message has been edited by ede (edited February 10, 2001).]
02-10-2001, 05:40 PM
#3
TGO Supporter
Thread Starter
max i was thinking if i was within .005 or .010 i'd be ok, but i could never find anything in my manuals that said for sure. sorry max i did get ahead of my self a little in the places and zeros ,i'll edit and fix it
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ICON Motorsports
1st & 3rd
[This message has been edited by ede (edited February 10, 2001).]
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ICON Motorsports
1st & 3rd
[This message has been edited by ede (edited February 10, 2001).]
02-10-2001, 09:10 PM
#5
Ede,
If you're concerned about the spring providing seat pressure, 80 pounds is generally enough on most intake valves under 2¼" diameter. Most aftermarket and performance springs start at over 100 pounds pressure at installed height.
If you have to settle for an installed height that is not exactly the OEM or design spec, install them a little taller than the specification if you can tolerate the extra rocker height. The extra lift before binding is preferable to the few extra pounds of seat pressure you might get at design height. If you've aleady machined the pockets to a given depth, try to get close to maintain valve train geometry, but don't worry about 5 thousandths - as Max says, the springs you're getting out of the box aren't 100% inspected and not that tight on tolerance.
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Later,
Vader
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"No matter how hard you try you can't stop us now..."
Adobe Acrobat Reader 4.0
If you're concerned about the spring providing seat pressure, 80 pounds is generally enough on most intake valves under 2¼" diameter. Most aftermarket and performance springs start at over 100 pounds pressure at installed height.
If you have to settle for an installed height that is not exactly the OEM or design spec, install them a little taller than the specification if you can tolerate the extra rocker height. The extra lift before binding is preferable to the few extra pounds of seat pressure you might get at design height. If you've aleady machined the pockets to a given depth, try to get close to maintain valve train geometry, but don't worry about 5 thousandths - as Max says, the springs you're getting out of the box aren't 100% inspected and not that tight on tolerance.
------------------
Later,
Vader
------------------
"No matter how hard you try you can't stop us now..."
Adobe Acrobat Reader 4.0
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