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Old 02-09-2008, 05:07 PM
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How to identify self aligning rockers?

How do you tell if a roller rocker is self aligning? I thought I knew but seemed to have confused myself. The project currently has guide plates installed, and am using hardened push rods. Some of the rocker bases will actually contact the screw in stud hex base when adjusted. I have tried longer push rods to correct the issue but I would rather pull the guide plates out to get the clearance.

Obviously, if I were to remove the guide plates I would want to make sure the rockers are self aligning, as it's a roller cam with stock Vortec roller lifters.

So, how do I tell if these after market RKE roller rockers are self aligning or not?

Thanks.

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Old 02-09-2008, 05:15 PM
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Self aligning rockers will have a guide on either side of the roller tip to keep the rocker centered on the valve stem.
Look at the rockers in this link, one is self aligning.
http://www.compcams.com/technical/Ca...106-07/269.pdf
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Old 02-09-2008, 05:18 PM
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Quote:
Originally Posted by 1ownerT
Self aligning rockers will have a guide on either side of the roller tip to keep the rocker centered on the valve stem.

Okay, I was correct and was thinking the same thing. For some reason I started thinking it had to do with the trunnion stem.

These are not self aligning then as I thought, so I have to leave the guide plates in, and I must use slightly longer push rods.

The only issue is this will push the rollers closer to the far end of the valve stem. It's in full contact, but closer than I would like. It will roll inward to the center of the stem as the valve opens but it makes me uneasy.
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Old 02-10-2008, 07:37 AM
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Old 02-10-2008, 08:02 AM
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Are you using 1.6 rockers? On 1.6's the pushrod cup is moved towards the trunion which in many cases will case the pushrod to either rub on the guideplate or rub on the pushrod slot in the head if it's an older head. If it's close you might be able to clearance the guide plates with a dremel just be careful about hitting the sides.
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Old 02-10-2008, 08:07 AM
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Quote:
Originally Posted by engineczar
Are you using 1.6 rockers? On 1.6's the pushrod cup is moved towards the trunion which in many cases will case the pushrod to either rub on the guideplate or rub on the pushrod slot in the head if it's an older head. If it's close you might be able to clearance the guide plates with a dremel just be careful about hitting the sides.

They are 1.5 rockers. That was one of the first things I checked when buying them, and verified them upon building. Luckily they are stamped with their ratio. I will look into maybe even finding some thinner guide plates. I was thinking last night I might be able to have them cut out on a water jet CNC machine, out of thinner steel. Any suggested material if I go that route?
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Old 02-10-2008, 10:34 AM
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I did an engine a couple of years back for a customer and used RHS Vortecs and ran into the same problem. After reviewing the options I decided to go with the self-aligning rockers. Longer pushrods would have given me enough clearance but then the geometry was way off. Longer valves weren't an economical choice either. I knew the motor would never see above 6500 so I went with stock GM self-aligning rockers I had taken off a ZZ4 engine that I had lying around the shop.
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Old 02-10-2008, 11:25 AM
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Quote:
Originally Posted by engineczar
I did an engine a couple of years back for a customer and used RHS Vortecs and ran into the same problem. After reviewing the options I decided to go with the self-aligning rockers. Longer pushrods would have given me enough clearance but then the geometry was way off. Longer valves weren't an economical choice either. I knew the motor would never see above 6500 so I went with stock GM self-aligning rockers I had taken off a ZZ4 engine that I had lying around the shop.

Yep, these are RHS Vortec heads, so I am traveling the same road. I'll keep an eye out for the self aligning rockers and see what I find.
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