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AU Rockers in a EF? 

 

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 Post subject: AU Rockers in a EF?
Posted: Thu Jul 23, 2009 9:38 pm 
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After reading the engine retro fit it states that the rocker arms are longer in the AU compared to a EF. 2:1 and 1:8.
A few questions.
1. Can I fit the AU rockers into the EF XR6?
2. How much extra lift will this create?
3. Is this a straight swap? and
4. Do aftermarket cams take into consideration the different ratios?
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 Post subject: Re: AU Rockers in a EF?
Posted: Thu Jul 23, 2009 10:14 pm 
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drew2229au wrote:
After reading the engine retro fit it states that the rocker arms are longer in the AU compared to a EF. 2:1 and 1:8.
A few questions.
1. Can I fit the AU rockers into the EF XR6?
2. How much extra lift will this create?
3. Is this a straight swap? and
4. Do aftermarket cams take into consideration the different ratios?



it will create less lift

 

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 Post subject: Re: AU Rockers in a EF?
Posted: Thu Jul 23, 2009 10:22 pm 
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Longer arms increase lift, not reduce.
Check this link about Holden V6

http://www.v6supercharged.com.au/rocker.asp
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 Post subject: Re: AU Rockers in a EF?
Posted: Thu Jul 23, 2009 10:47 pm 
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yea thats right.. but holdens go from 1.65:1 to 1.9:1 ..
your asking if you can use 1.8:1 instead of 2.0:1..
which means your going backwards....

in the the case of fitting 2.0:1 rockers on a 1.8:1 cam it will create to much lift and bend the valves,break rocker arms..
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 Post subject: Re: AU Rockers in a EF?
Posted: Thu Jul 23, 2009 11:02 pm 
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My mistake. I thought the AU rocker arms were the longer of the two hence why I asked. My bad.
Just out of interest if, I was to put EF rockers into a AU, would the extra lift bind the springs or the valve kiss the pistons?
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 Post subject: Re: AU Rockers in a EF?
Posted: Thu Jul 23, 2009 11:07 pm 
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yes....
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 Post subject: Re: AU Rockers in a EF?
Posted: Thu Jul 23, 2009 11:32 pm 
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has been covered a few times before, but some ppl ive spoken to swear that they've seen some sort of hybrid concoction of interchangable parts that works

 

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 Post subject: Re: AU Rockers in a EF?
Posted: Thu Jul 23, 2009 11:38 pm 
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i have seen au heads with ef cams using ef rockers and ef heads using au cams and au rockers..
but those that i know of that have mixed and matched au cams with ef rockers have ended in disaster...
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 Post subject: Re: AU Rockers in a EF?
Posted: Thu Jul 23, 2009 11:57 pm 
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i think there was someone recently who put a combo on and bent the valves. cant remember who or what combo tho

 

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 Post subject: Re: AU Rockers in a EF?
Posted: Fri Jul 24, 2009 12:28 am 
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Thanks guys.
I'm glad you cleared that up for me and I didn't waste my money swapping rockers to go backwards
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