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Valve Springs for setting up Rocker Geometry
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msaltz
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PostPosted: Thu Aug 02, 2018 6:59 pm    Post subject: Valve Springs for setting up Rocker Geometry Reply with quote

When setting up/adjusting rocker geometry using an adjustable push rod is there a weaker valve spring that should be installed? If so does anybody have a source for where to get them? Any insight would be greatly appreciated.
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vwracerdave
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PostPosted: Thu Aug 02, 2018 8:44 pm    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

I bought a couple of $2.00 springs at the local hardware store that were about the size of a VW valve spring and I could compress with my fingers. Jeg's and Summit also sell checking springs.
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PostPosted: Fri Aug 03, 2018 12:32 am    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

I use stock Type 4 rockers end play springs.

Image may have been reduced in size. Click image to view fullscreen.


Those are nice because you can also push the valve on the piston top to check clearances when mocking the engine.

Image may have been reduced in size. Click image to view fullscreen.

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msaltz
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PostPosted: Fri Aug 03, 2018 2:57 pm    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

Thanks for the info. Never thought of checking the hardware store. I'll check there first and see what they have.

The type 4 rocker end play springs do look like the ticket though.
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UK Luke 72
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PostPosted: Sat Aug 04, 2018 3:46 am    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

I use a spring off a set of spring loaded push rod tubes.
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FreeBug
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PostPosted: Sat Aug 04, 2018 10:29 pm    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

In a pinch you can wrap coat hanger wire around a piston pin. Works.
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Sharp64
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PostPosted: Sun Dec 29, 2019 11:20 am    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

Tried searching and couldn’t find the answer. But what is the reasoning behind using a softer spring when setting geometry? Is it due to using the adjustable rod?
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67rustavenger
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PostPosted: Sun Dec 29, 2019 11:26 am    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

The softer spring is used to set the rocker geo. Without having to use the cam and lifters to move the rocker arm.
Basically you can get the geo set with the head off the engine when using the soft springs. I got my soft springs from Ace Hardware.
Image may have been reduced in size. Click image to view fullscreen.

After the geo is set. You install the head and figure out the correct PR length.

Good Luck.
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FreeBug
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PostPosted: Sun Dec 29, 2019 11:46 am    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

67rustavenger wrote:
The softer spring is used to set the rocker geo. Without having to use the cam and lifters to move the rocker arm.
Basically you can get the geo set with the head off the engine when using the soft springs. I got my soft springs from Ace Hardware.
Image may have been reduced in size. Click image to view fullscreen.

After the geo is set. You install the head and figure out the correct PR length.

Good Luck.


Is the wire clip hole offset like that on purpose?
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67rustavenger
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PostPosted: Sun Dec 29, 2019 11:51 am    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

FreeBug wrote:
67rustavenger wrote:
The softer spring is used to set the rocker geo. Without having to use the cam and lifters to move the rocker arm.
Basically you can get the geo set with the head off the engine when using the soft springs. I got my soft springs from Ace Hardware.
Image may have been reduced in size. Click image to view fullscreen.

After the geo is set. You install the head and figure out the correct PR length.

Good Luck.


Is the wire clip hole offset like that on purpose?

The heads are Tim's stage 2. They came that way and the bails give the correct tension on the valve covers.
I can only imagine that the Tim's measured the distance to get the bail over the valve cover. Before the hole was drilled.
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mark tucker
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PostPosted: Sun Dec 29, 2019 12:00 pm    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

my old pop up sprinklers have awesome stainless steel springs in them that are perfect. a spring is a spring if it will fit it will work.small dia or large as long as it 1 stays on the retainer,2 dosent coil bind. 3 has enough force& length to hold the valve closed.
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PostPosted: Sun Dec 29, 2019 9:05 pm    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

Sharp64 wrote:
Tried searching and couldn’t find the answer. But what is the reasoning behind using a softer spring when setting geometry? Is it due to using the adjustable rod?


You get better results because your pushrod doesn't flex, the engine stays put when you turn it to a certain position instead of the spring pushing back, you can play with adjustments easily, you don't have to worry about the tension pushing your rocker sideways thus loosing lift, and other things. I was just outside doing geometry for my new engine. With my soft checking spring, I was able to push the retainer down, pull my lash cap and continuously check the swipe.
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APPLEGREENVW
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PostPosted: Sun Dec 29, 2019 9:13 pm    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

FreeBug wrote:
In a pinch you can wrap coat hanger wire around a piston pin. Works.

That's a good idea. Cool
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PostPosted: Sun Dec 29, 2019 10:19 pm    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

67rustavenger wrote:
The softer spring is used to set the rocker geo. Without having to use the cam and lifters to move the rocker arm.
Basically you can get the geo set with the head off the engine when using the soft springs. I got my soft springs from Ace Hardware.
Image may have been reduced in size. Click image to view fullscreen.

After the geo is set. You install the head and figure out the correct PR length.

Good Luck.

I’m currently trying to set geometry and admit I’m a bit of a moron, but how are you able to set geometry without installing cam and lifters and adjustable pushrod? I’d appreciate any tricks, cause this sucks
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67rustavenger
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PostPosted: Sun Dec 29, 2019 10:36 pm    Post subject: Re: Valve Springs for setting up Rocker Geometry Reply with quote

Here's a thread on the topic. Read it all the way through! It'll make sense in the end.
https://www.thesamba.com/vw/forum/viewtopic.php?t=706356&highlight=
If you are trying to use the slipper type of rockers. You likely need to shave the rocker arm blocks (the ones on the rocker arm shaft. Not the head) 0.060".
I did mine on a belt sander and measured frequently as I shaved them to get the geo correct.

Good Luck.
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Buy Once, Cry Once!

There's never enough time to do it right the first time. But there's always enough time to do it thrice.
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