2QYK4U

One of my co-workers said something about hydraulic lifters not needing adjustment. So, my questions to you all is:

1. Is this statement correct?
2. Does the S2000 have hydraulic or solid (not sure if this is the correct terminology) lifters?
3. Do I need to be concerned with valve adjustments on my MY06 S2000?

Thanks for your help!

xviper

There is no valve adjustment with hydraulic lifters, BUT, the rockers have to be installed and set correctly to begin with.

The S2000 has "solid" lifters.

At some point, you will have to concern yourself with doing a valve adjustment on any S2000. Not all are adjusted correctly from the factory, so whether or not your '06 will need one in its first year is unknown. The service manual recommends a valve adjustment when the valvetrain makes excessive noise. But then ........... what's "excessive" noise?

I've never done a valve adjustment on my '00 and it's approaching 45K miles. Some guys have indicated theirs needed one after a few thousand miles.

ottokrat

I have an '06 with 4500 miles on it. I just had a valve (lash) adjustment performed. I did it not because I thought it needed it, but because I have found that an attention to detail often yields results.

Prior to adjustment, 6 of 8 exhaust valves were already on a tight 0.010. 1 was close but needed some adjustment. And the last one was at the loose end of spec. So in total 2 of 8 were adjusted to the tight 0.010.

Prior to adjustment, none of the intake valves were at the tight 0.008. 6 of 8 were at the loose end of spec, and the other 2 were in the middle of the range. So all 8 were adjusted to the tight 0.008.

I paid $100 to have this done. I'd do it again in a heartbeat. Most of the improvments go to what I would describe as drivability rather than raw horsepower.

Here are specific observations from the [subjective] butt-dyno, from immediately before to immediately after, no other mods done. (Note, my mechanic did not take out the spark plugs, so they remain in the same exact positions.)

Idle/steady speed
• Idle seems just a hair quieter
• Vibration less at freeway speed (4k rpm)

Part throttle/mild acceleration
• Part throttle flat/rough spot around 2750rpm is gone
• Throttle response is crisper/quicker above 2k rpm
• Accel feels smoother, more willing 2k-4k rpm
• Power is down under 2k rpm (increasingly noticable in higher gears)

Full power (butt dyno says, take with a grain of salt):
• Non-VTEC seems a bit stronger 4-6k, in particular around 5.5k rpm
• In VTEC seems stronger at around 7.2k rpm

Eluded

if the valves are too tight, valves might make contact. as honda notes you can hear this, sounds like a very lite tapping....

2QYK4U

As usual...thanks for the great info!

Do you have any idea as to whether a K20A2 has hydraulic or solid lifters?

Ek9

Solid. They need vave adjustments too. Page 6-11 in the manual.

mxt_77

Not familiar w/ hydraulic lifters. Isn't that what is used in Formula One cars? Do any street cars use them?

xviper

[QUOTE=mxt_77,Sep 2 2006, 06:05 PM] Not familiar w/ hydraulic lifters.

Ek9

Yeah lots of cars use them. They're virtualy maintainance free and ensure a quiet valve train that doesn't need adjustment.

Slows2k

Most honda's use solid cams, without hydraulic lifters. The 87-90 Legend and 95-97 Accord V6 are the exceptions.

K, B, F, D motors all use a "solid" cam with no hydraulic lifters.

I've got a 340 chrysler in the garage with some collapsed hydraulic lifters. So much for being trouble free

Formula 1 cars use pnuematic valvetrains, with no valvesprings to operate at the extreme RPM ranges of F1.