valve lash
does the valve lash of a cam effect the performance of it
i foud a cheaper cam with the specs as as the comp cam i was looking at but the lash on it is .026 intake .028 exhaust and the comp cam is .20 on the intake and .022 on the exhaust what difference will this make? if any? thanks -logan |
I've never run as much lash as mfg says to use. I only ran .015 on my little BBC.
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Re: valve lash
Originally Posted by mrbigtrucks
does the valve lash of a cam effect the performance of it
what difference will this make? if any? thanks -logan One opinion . . . . |
:D :D :D :D
"risk a slight misunderstanding" I LIKE that term ! A kinder gentler way of saying "Catastrophic engine failure" :cry: :cry: :cry: :cry: :cry: :cry: :cry: :cry: :cry: |
Cam companies have their reasons for establishing certain lashes for certain lobe profiles. We don't know why,but they do. And they are not going to do anything to make their cams make LESS power. That's their reputation on the line. You can loosen lash for less duration in the hopes for more bottom end power. Or tighten it up for more duration like stated before,for topend.But the effects are usually minimal,especially for the risk you are taking. Why did they specify that particular lash????....who knows,just go by it and you'll have one less worry.
But you asked "why" they were different,not if you can change the lash. Looser lash cams typically have a more aggressive lobe profile.Like faster opening ramps. |
ok thanks guys
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Re: valve lash
Originally Posted by mrbigtrucks
does the valve lash of a cam effect the performance of it
i foud a cheaper cam with the specs as as the comp cam i was looking at but the lash on it is .026 intake .028 exhaust and the comp cam is .20 on the intake and .022 on the exhaust what difference will this make? if any? thanks -logan |
ok so i should set the lash warm it up and check again and readjust if needed?
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Valve lash
When I am initially set valve lash cold on an aluminum headed, iron block engine,
I take the cam builders hot specs and go .004" loose cold. When the engine is fully up to temperature and heat soaked for a little while, I recheck the lash and see what the difference from spec is. I correct it to spec. I use the difference I saw warm to change the cold setting. Next time I check it hot again to see if it is right. I don't vary hot lash from spec except to see if it is faster with .004" less or more lash seperately on the intake and then the exhaust.. Then I go back to spec. If I want to go faster, I go back to the cam guy and tell him the results and have a different cam ground for that combination. On an iron head/block, I go .004" tighter cold and recheck hot. |
ok thnaks
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