Honda tick tick ticka
01-11-2003, 06:45 PM
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Honda tick tick ticka
I have a tick coming from the engine (b16)...its more than the average honda valve tick. It is a valve tick, and it stops when I go into vtec. So what would need adjustment or replacement when the valves tick not in vtec...and not tick when in vtec?
under 5200=tick
vtec=no tick
[Modified by FitCRX, 3:47 AM 1/12/2003]
under 5200=tick
vtec=no tick
[Modified by FitCRX, 3:47 AM 1/12/2003]
01-11-2003, 06:53 PM
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Re: Honda tick tick ticka (FitCRX)
adjust your lash. i suppose the intake valves on low speed profile have too much clearance.
stan
stan
01-11-2003, 08:14 PM
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Re: Honda tick tick ticka (battlecat187)
I don't know what the lash is...never heard of it. Can you give me an idea of how to adjust it and where it is? I noiced the change in tick Im guessing immediately, would that make a difference...weither its broke..or just needs adjustment? With the information below...doesn't tell me specs for b16a1, and how to adjust. Thanks
What Is "Valve Lash"?
[RB] Valve lash is the mechanical clearance between the cam lobe and valve stem or transfer rocker when the valve is fully closed. It's usually checked with a feeler gauge and is some non-zero value on with "mechanical" non-self adjusting valve lifter mechanisms.
Differential expansion characteristics cause the cold clearance to be different than the running clearance and margin is built in to make sure their is always some clearance, especially on exhaust valves. An exhaust valve that doesn't close completely doesn't transfer enough heat back to the head and can "burn".
Cam lobes have entry and exit profiles (called ramps) which are designed to limit the opening and closing acceleration of the valve to limit mechanical stress and also noise. Still, the tighter you set the valve lash (less clearance) the more open valve duration you get which tends to boost top end performance slightly. The looser you set the valve lash the more bottom end is boosted and the more valve train noise you get.
If you have all the valves adjusted too tight idle quality and low end performance may suffer slightly with an attendant small gain in top end horsepower. Looser valve lash does the opposite and results in a noisier valve train.
If you have some tight and some loose that might also effect smoothness since different cyclinders will have different power contributions at different RPMs. Some of the above is a little simplified but you get the drift.
Why Does Valve Lash Need Adjusting?
[LE - 99/12/28] Too much lash can accelerate wear on the rocker arms, cam followers, cam lobes, valve stem tips and valve seats. How much it does depends on the engine and how far out of spec the lash is. Too much lash also tends to make more noise so you're more likely to know it needs adjusting.
Too little lash is more dangerous both because it leads to more serious problems and because it doesn't make any noise. Luckily the NSX valves do not tend to get tighter so unless they are adjusted incorrectly it should not be a problem.
But just for your info, too tight a lash may allow the lash to close up as heat builds up in the engine - especially if the engine begins to run hotter than normal because it's being worked hard. This gets worse as the engine gets hot because valve clearances tend to close up as the parts heat. That's why the NSX shop manual specifies that you should do the gap adjustment when the engine is cold. Some other engine service manuals will specify seperate hot and cold adjustments. The loss of lash can prevent the valves from fully seating which results in loss of compression and valve overheating. Exhaust valves rely on cooling through the valve seats much more than intake valves, so loss of lash in the valvetrain often results in a burned exhaust valve
What Is "Valve Lash"?
[RB] Valve lash is the mechanical clearance between the cam lobe and valve stem or transfer rocker when the valve is fully closed. It's usually checked with a feeler gauge and is some non-zero value on with "mechanical" non-self adjusting valve lifter mechanisms.
Differential expansion characteristics cause the cold clearance to be different than the running clearance and margin is built in to make sure their is always some clearance, especially on exhaust valves. An exhaust valve that doesn't close completely doesn't transfer enough heat back to the head and can "burn".
Cam lobes have entry and exit profiles (called ramps) which are designed to limit the opening and closing acceleration of the valve to limit mechanical stress and also noise. Still, the tighter you set the valve lash (less clearance) the more open valve duration you get which tends to boost top end performance slightly. The looser you set the valve lash the more bottom end is boosted and the more valve train noise you get.
If you have all the valves adjusted too tight idle quality and low end performance may suffer slightly with an attendant small gain in top end horsepower. Looser valve lash does the opposite and results in a noisier valve train.
If you have some tight and some loose that might also effect smoothness since different cyclinders will have different power contributions at different RPMs. Some of the above is a little simplified but you get the drift.
Why Does Valve Lash Need Adjusting?
[LE - 99/12/28] Too much lash can accelerate wear on the rocker arms, cam followers, cam lobes, valve stem tips and valve seats. How much it does depends on the engine and how far out of spec the lash is. Too much lash also tends to make more noise so you're more likely to know it needs adjusting.
Too little lash is more dangerous both because it leads to more serious problems and because it doesn't make any noise. Luckily the NSX valves do not tend to get tighter so unless they are adjusted incorrectly it should not be a problem.
But just for your info, too tight a lash may allow the lash to close up as heat builds up in the engine - especially if the engine begins to run hotter than normal because it's being worked hard. This gets worse as the engine gets hot because valve clearances tend to close up as the parts heat. That's why the NSX shop manual specifies that you should do the gap adjustment when the engine is cold. Some other engine service manuals will specify seperate hot and cold adjustments. The loss of lash can prevent the valves from fully seating which results in loss of compression and valve overheating. Exhaust valves rely on cooling through the valve seats much more than intake valves, so loss of lash in the valvetrain often results in a burned exhaust valve
01-12-2003, 07:23 AM
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Re: Honda tick tick ticka (FitCRX)
if you have taken the head completely apart make sure that u tighten the hex bolts that hold the cam assembly together. the shaft that the rocker arms r on could be loose. i know that is far fetched but give it a shot. check the small stuff first though, ie valve lash, loose bolts, etc. good luck.
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