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what is the ratio of a series standard rockers?
Home away from home
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2006/9/24 10:20
From bathurst nsw
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hey guys just after the ratio of a series standard rockers. As i have a set of yella terra 1.55 ratio rockers and just need 2 know if it is the same

Posted on: 2010/3/22 11:41
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Re: what is the ratio of a series standard rockers?
No life (a.k.a. DattoMaster)
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From East New Britain, Papua New Guinea
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Spot-on I reckon?

Posted on: 2010/3/22 11:54
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Re: what is the ratio of a series standard rockers?
No life (a.k.a. DattoMaster)
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i heard mentioned the stockies are 1.45..

Posted on: 2010/3/22 12:03
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Re: what is the ratio of a series standard rockers?
No life (a.k.a. DattoMaster)
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2002/6/14 7:24
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Just had a quick look in my Nissan factory "Service Manual - Model A10 and A12 Engine" issued 1st Mar 1970.

It lists the rocker arm ratio is 1.42:1

As for the YellaTerra rockers. I have seen them in 1.55 & 1.65:1 ratio, not sure if the later are available anymore though

Posted on: 2010/3/22 12:14
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Re: what is the ratio of a series standard rockers?
No life (a.k.a. DattoMaster)
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2003/6/27 14:53
From Southern Tablelands N.S.W. Australia
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When I bought my roller rockers I spoke with someone at Yella terra who insisted that the roller rocker ratio was in fact 1.54 to 1 & that the standard rocker ratio was 1.44 to 1.

If the factory published literature says 1.42 for stockers then I would go with that & if the roller ratio is really 1.54 instead of 1.55 then I guarantee that your engine will never know the difference.

Posted on: 2010/3/22 13:56
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