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****Warning for 2006-2009 owners (DBW cars)****

S2000 Under The Hood S2000 Technical and Mechanical discussions.

****Warning for 2006-2009 owners (DBW cars)****

Old 10-03-2018, 05:00 PM
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Originally Posted by rpg51 View Post
JasonMG - those are your exhaust specs? Tight!
What year is your engine?
Do you have good compression?
Yeah, those were exhaust, in inches. Car is a 2006 and was running fine before, is running fine after.

Haven't tested compression yet; will do that this weekend, maybe. Any suggestion on a good tool for it from Amazon?
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Old 10-04-2018, 06:10 AM
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If the valves are properly adjusted (exhaust to 0.012") and the car is running fine why do you want to check the compression? Nothing you can do about it anyway without tearing the engine down.

Nominal: 228 psi
Minimum: 135 psi
Max variation (between cylinders): 28 psi.

You need to reset the ECU after running a compression test as there will be an "all injector off" error in it.

See Page 6-7 of the 2000-2008 Service Manual <-- that's a link. Link to it and download it.

-- Chuck

Last edited by Chuck S; 10-04-2018 at 06:23 AM.
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Old 10-07-2018, 07:55 AM
Join Date: Apr 2006
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I just performed a valve adjustment on my 2005 S2000, and almost all the exhaust valves were off, some VERY tight. I know this thread is for the 06+ but I just wanted to share for those who read. My car has 150k miles on it, and I doubt the valves had ever been adjusted. Here were my findings from front to back:

Cylinder #1
tighter than .005" (my smallest feeler gauge is .005")

Cylinder #2

Cylinder #3
tighter than .005"

Cylinder #4

Went ahead and set them all to .011"
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Old 10-07-2018, 08:00 AM
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Is your engine running well?
What were your intakes at?
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Old 10-07-2018, 08:06 AM
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Yes the car seems to run just fine. The whole reason I checked the valves was because of my compression test results that were all over the place. I made a thread about it if you want to check it out. All the intake valves were in spec between .009-.010", but I set them all to .009" so they're all the same.
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Old 10-07-2018, 09:06 AM
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A buddy's '02 had excessively tight intake and exhaust valves when we adjusted his and mine a couple of summers ago. 0.012" for the exhaust was our settings based on posts here.

-- Chuck
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Old 10-28-2018, 04:02 PM
Join Date: Sep 2009
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i just finished up with my valve adjustment and some fresh spark plugs, spark plug seals, valve cover nut and cover seals. the valve cover seal and spark plug seals were no longer pliable and were in need of a change despite the low mileage. i don't believe the valve cover has ever been taken off since being built by factory 12 years ago.

2006 model, 38k miles.

all intake valves were tight 0.008. was actually impressed and i didn't have to adjust anything.

all exhaust valves were tight, some more excessively than others but all out of spec. i loosened them all up to moderate 0.011, light drag. gives me a lot of peace of mind now!

thanks to all who have contributed to the thread. i would highly suggest everyone to check those exhaust valve specs if you haven't done so even if you have low mileage.
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Old 11-06-2018, 05:44 AM
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Man its been so long i dont remember clearly anymore. Maybe it was in regards to the fuel pump hangar where there was a difference. Just double check. Id hate to sell you the wrong part.
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Old 03-26-2019, 02:53 PM
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Just completed a valve adjustment on my 08 with 14K Miles and I wanted the share my results.

Measurements before adjusting:
#1 Exhaust: .013 Intake: .009
#2 Exhaust: .012 Intake: .009
#3 Exhaust: .013 Intake: .010
#4 Exhaust: .012 Intake: .010

I adjusted the valves that were out of spec to .012 for exhaust and .009 for intake.
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Old 03-26-2019, 03:53 PM
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^ Octane fuel are you running ?
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