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1.8 yella new kind?

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Old 01-02-2008, 10:06 PM
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Default 1.8 yella new kind?
are these the new lightweight kind? there 1.8 that im buying from a friend. how much u think this will give me?
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Old 01-03-2008, 12:12 AM
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yes, those are the lightweight ones. I'm sure there will be some gain, but i'm not even going to guess. I bought aftermarket rockers more for stability than performance.

Steve
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Old 01-03-2008, 04:18 AM
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What springs are those? Make sure to check the wipe pattern, its critical especially with 1.8's. Report back results.
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Old 01-03-2008, 08:35 PM
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z06 springs
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Old 01-03-2008, 08:35 PM
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what is wipe pattern?
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Old 01-03-2008, 08:59 PM
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Originally Posted by crazymofo1986
what is wipe pattern?
The pattern that the roller tip leaves on the valve tip.
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Old 01-04-2008, 06:54 AM
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I have found when I installed the Yella Terra's the best wipe pattern is achieved with the supplied shims in place. Once you do this, you will need longer pushrods as well.
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Old 01-04-2008, 02:57 PM
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if i dont use the shims bc i would have to get other pushrods then what and happen if the wipe was not that great
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Old 01-04-2008, 04:02 PM
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Bad wipe can mean side loading the valves increasing guide wear and leaving power on the table.
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Old 01-04-2008, 06:30 PM
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Originally Posted by vettenuts
I have found when I installed the Yella Terra's the best wipe pattern is achieved with the supplied shims in place. Once you do this, you will need longer pushrods as well.
I have a set of these that are going to be installed on my new engine so I'm wondernig what dictates the best wipe pattern and how to determine it?
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Old 01-04-2008, 08:01 PM
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Originally Posted by Beaflag VonRathburg
I have a set of these that are going to be installed on my new engine so I'm wondernig what dictates the best wipe pattern and how to determine it?
Its discussed in the cam sticky up top.
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Old 01-04-2008, 08:02 PM
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Originally Posted by Beaflag VonRathburg
I have a set of these that are going to be installed on my new engine so I'm wondernig what dictates the best wipe pattern and how to determine it?
you want the pattern to be right down the center of the valve tip. yes this sounds like a no brainer, but many valvetrains are setup with wipe patterns that are off to the side.
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Old 01-04-2008, 09:38 PM
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Centered and narrow, you should be able to achieve a 0.060" wide wipe pattern with these rockers. This is one of the primary advantages of these rockers, don't waste it.
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