xxxtreme22r

In a recent thread it was brought up that opening the valve lash can lower your poower curve at the cost of some extra valve noise. My question is (yes I already searched came up with people just complaining about valve noise) what are the drawbacks of extra vavle train noise. I am just thinking of extra wear on the rockershafts on the valve side, the adjuster nuts and valves but how much? Thinking of setting my EB 268 cam to 8 and 10 intake exhaust. Should be 7 and 9. At 7 and 9 I have some valve train noise now (normal I know) mostly at above 2000 RPM hardly any (maybe 1 noisy) at idle when cold and just noticeable when warm. This might not be due to lash but worn rockers and/or shafts. Not really complaining though. Using 10-30 Valvoline DINO. About 1500 miles on rebuild and new complete stock style head/valves from ENGNBLDR new adjuster nuts but reused rockers and shafts that have 175,000 miles on them.

Thanks all.

yotarob2005

subscribed to get an answer, Also thinking of setting mine at .008" & .010".

mightymouse

iTrader: (6)

I have the 268 cam and have played with the valve lash a little enough to give an opinion. When i built my motor i neglected to read up on valve lash for the 268 cam and set the lash to stock specs at .008 and .012. It was noisy. After searching and finding the true settings i didn't want to go too far after just recently breaking in the motor so i set the lash at .008 and .010. Sounds and runs perfect no complaints. So i decided to leave it there. It is to my understanding that setting the valve lash tighter will quiet down the chatter made by a after market cam. I could be wrong but i don't think the .001 difference will be noticable enough to promote a change for the better regarding the noisy 22re. My engine sounds like a sewing machine when it's running. Not too much different from the old motor it's just tighter and you can hear the lope from the cam through the exhaust. Just my two cents. Try it but i think it'll get louder the more you loosen the valve lash.

xxxtreme22r

not really worried about it getting louder, just don't want to "overwear" the already 175,000 valve train and new valves/cam. Forgot to mention I also use lucas as well.

mightymouse

iTrader: (6)

I use lucas as well along with royal purple (overkill i know). To be honest try it. Worse case scenario your engine is a little louder. Also ponder this, loose parts cause things to wear faster right? I would venture to guess that if you loosened the valve train too much it would have a worse affect than leaving it at spec or close to spec. Think about taking a big swing with a hammer on an object or a small swing well we all know which is going to have a bigger affect on the piece being struck right? Now scale that down to your valve train ( a stretch i know but bear with me) wouldn't the same thought process apply? Going up to .008 and .010 isn't much and most likely will have little to no affect but just a thought. I would think finding a happy medium would be you best bet so try it. It's not like it's hard to set it back to your original settings if your not happy or comfortable. I'm most likely over thinking it.

xxxtreme22r

no thats what i was thinking more wear theoretically but not enough to worry about which is why I asked how much more, and going too far will start to have adverse effects i would imagine on how well the engine runs before any problems stat to occur mechanically. wish i just had the lce adjustable cam gear and advance my cam timing back to where it should be and be done with it lol.

pruney81

How much Lucas do you guys use? I get a little more valve noise than I'd like on the occasional dry start. I'm using Castrol 10W30 right now.

xxxtreme22r

full bottle

mightymouse

iTrader: (6)

ditto sub one bottle of lucas for a quart of oil it works wonders. At least that's what i tell myself for such an expensive oil change.

abecedarian

Running loose valves? Well, other than taking away from the purpose of using a high rate/duration cam, not much else will happen, for at least a while.
Most cam profiles are designed for a smooth transition from heel to lift, and slop in the train will move the point stress is applied to the cam lobe to a later position in its rotation.

Let me ask this:
If you're riding a bike, when do you put your weight on the downstroke of the pedal? Just slightly after the pedal travels over the top or you wait until the pedal is 1/2 of the way down?

xxxtreme22r

Didn't say loose, just going from 7 and 9 to 8 and 10. Unless someone wants to trade a hardly used 261 for my 268 so I can try it out. lol.

xxxtreme22r

that's what I am thinking but ENGNBLDR talked me into the 268. now am not too sure if I made the right decision. kinda like the 32/36 vs the 38.

abecedarian

You didn't have to say loose.

But that is what you're doing: increasing the clearance- making the valves more loose.

Increasing the clearance means that the cam applies pressure to the rocker arm at a later point in the camshaft's rotational period, valve lift is reduced, and the valve closes earlier, thus reducing or possibly negating the effects and purpose of the cam.