Rocker arm geometry with 1.6 rockers - Team Camaro Tech
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post #1 of 4 (permalink) Old Apr 13th, 11, 07:55 PM Thread Starter
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Matt
 
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Rocker arm geometry with 1.6 rockers

I am trying to determine the correct pushrod length and have looked at a lot of threads on determining proper rocker arm ratio. It seems there are two different schools of thought. One is to focus on having the roller wear pattern centered on the valve steam. The second is to focus on having the wear pattern be as narrow as possible and not worry about the location on the valve stem.

Ideally I would think you want both but I haven't been able to accomplish this. I can get the wear pattern to be centered on the valve stem or I can get the pattern to be narrow but it is located near the exhaust side of the tip. I have seen some people can accomplish this but I can't. Which should I choose?

Also, does using 1.6 ratio rockers cause the most narrow wear pattern to be pushed out toward the exhaust side of the valve stem more than it would with a 1.5 ratio rocker?

Thanks for the help.

Matt

Matt
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post #2 of 4 (permalink) Old Apr 14th, 11, 05:48 AM
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Don
 
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Re: Rocker arm geometry with 1.6 rockers

Mocking up with an adjustable push rod and using a felt pen for valve stem tips, I would look for the most center and outer center of the valve pattern.

Don
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post #3 of 4 (permalink) Old Apr 14th, 11, 04:24 PM
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AJ
 
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Re: Rocker arm geometry with 1.6 rockers

Just thinking out loud but if the wear pattern is too far back towards the exhaust I'd think you'd need a shorter pushrod, that is assuming the geometry stays the same, if not my thinking could be reversed....

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post #4 of 4 (permalink) Old Apr 14th, 11, 10:09 PM
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darrell
 
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Re: Rocker arm geometry with 1.6 rockers

don is right on the way to do it in my opinion-longer the push rod , goes to exhaust-main thing one is trying to do is stop wear and friction on guides--center is way to go-and womens lipstick sometimes works best and adjustible push rod
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