Valve Springs
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Valve Springs
I have a bag of AP1 valve springs that I got from a friend. They have been washed so that there’s no paint (yellow or blue). I have no idea how to tell which ones are intake or which ones are exhaust. I know they’re two different part numbers but could they be interchangable without problems? Or is there a way to tell them apart without the paint? Thanks.
Joined: Jul 2014
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From: Chesterfield VA
When new the exhaust valves have a slightly longer free length. May or now hold true once they're been in service under heat.
Source: S2000 Service Manual (2000 to 2008) Page 2-3:
The spring rates for the OE valves are not listed, just the free length of new springs:
AP1 (00-03) intake: 49.77mm
AP2 (04-08) intake: 49.76mm
All (00-08) exhaust: 50.39mm
The service manual is specific about placing each spring back on the exact same valve it same off of. Don't mix them up. Seems that's been done.
-- Chuck
Source: S2000 Service Manual (2000 to 2008) Page 2-3:
The spring rates for the OE valves are not listed, just the free length of new springs:
AP1 (00-03) intake: 49.77mm
AP2 (04-08) intake: 49.76mm
All (00-08) exhaust: 50.39mm
The service manual is specific about placing each spring back on the exact same valve it same off of. Don't mix them up. Seems that's been done.
-- Chuck
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