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Stronger valve springs for AU 302W 

 

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 Post subject: Stronger valve springs for AU 302W
Posted: Tue Nov 08, 2011 10:38 pm 
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Hi, It seems I have a noisy valve train in my au 302 when the revs start getting up around 4000, I have installed a cam out of an el gt which has a bit more lift and got rid of the 1.6 rockers and bolted on some yella terra 1.7 roller rockers, can anyone advise me what springs that would be better suited, thanks

 

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 Post subject: Re: Stronger valve springs for AU 302W
Posted: Tue Nov 08, 2011 11:52 pm 
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how much preload on the lifters with those rockers and that cam? youu push rods might be slightly short which will give you noise
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 Post subject: Re: Stronger valve springs for AU 302W
Posted: Wed Nov 09, 2011 12:10 am 
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When I was running the standard 1.6 rockers there was no noise at all. how do I check the preload?

 

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 Post subject: Re: Stronger valve springs for AU 302W
Posted: Wed Nov 09, 2011 8:20 am 
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i thought you had to use a longer valve stem with those rockers.. correct me if im wrong i might be mixed up with something else.

 

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 Post subject: Re: Stronger valve springs for AU 302W
Posted: Wed Nov 09, 2011 3:17 pm 
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Why do you waste peoples time by starting multiple threads on the same issue?

 

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 Post subject: Re: Stronger valve springs for AU 302W
Posted: Wed Nov 09, 2011 8:14 pm 
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xafalcon wrote:
Why do you waste peoples time by starting multiple threads on the same issue?

First off , basically got an answer for the first thread,
2nd, If I ask the question as the subject, most likely to get an answer to it, just wanna know about some springs
3rd If you dont know what I am after or where I can get it in Australia don't waste your time and answer, its only a forum not a court case.

 

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 Post subject: Re: Stronger valve springs for AU 302W
Posted: Wed Nov 09, 2011 8:16 pm 
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chris sieclay wrote:
i thought you had to use a longer valve stem with those rockers.. correct me if im wrong i might be mixed up with something else.

The rockers are made to suit a 302 & supposed to be a straight changeover.

 

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 Post subject: Re: Stronger valve springs for AU 302W
Posted: Wed Nov 09, 2011 9:25 pm 
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you will need to check your lifter preload, and use that info to determine whether the pushrods are of correct length, if they are not, then you will need to determine what length rods you need and change them over.
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 Post subject: Re: Stronger valve springs for AU 302W
Posted: Wed Nov 09, 2011 10:30 pm 
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66 coupe wrote:
you will need to check your lifter preload, and use that info to determine whether the pushrods are of correct length, if they are not, then you will need to determine what length rods you need and change them over.

Thanks, am I correct in saying that the lifter preload is the gap between the valve and the rocker when the valve is closed and before the rocker applies any pressure on it ?

 

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 Post subject: Re: Stronger valve springs for AU 302W
Posted: Thu Nov 10, 2011 10:19 am 
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lifter preload is how far down the push rod goes into the lifter on the base of the cam when tightning the rocker bolts down, check both intake and exhaust and both banks as they could differ
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 Post subject: Re: Stronger valve springs for AU 302W
Posted: Thu Nov 10, 2011 2:20 pm 
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Had a bit of a look on the internet to see what is involved in checking the preload, I gather the intake manifold has to come off to do this, bit of a job for me i can pull things apart and put back together but when it comes to the technical side of things well I might need a mechanic to do it, in the mean time if the push rods are too short can it damage the motor as I have been driving around for nearly 12 months since I changed the rockers, thanks

 

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 Post subject: Re: Stronger valve springs for AU 302W
Posted: Thu Nov 24, 2011 8:50 am 
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To answer the spring question:

Crow 7738 springs
Crow 12700-XR8 retainers
Crow 11700 collets

All parts are a straight fit, just make cure you get the retainers on in the correct position, as the intake & exhaust are different.

 

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 Post subject: Re: Stronger valve springs for AU 302W
Posted: Sun Nov 27, 2011 11:23 pm 
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BOTTLEDUP wrote:
To answer the spring question:

Crow 7738 springs
Crow 12700-XR8 retainers
Crow 11700 collets

All parts are a straight fit, just make cure you get the retainers on in the correct position, as the intake & exhaust are different.

Thanks

 

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