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> Update 09/12/14 - In Production:, precision stainless steel pushrod tubes
ChrisFoley
post Feb 20 2014, 01:03 PM
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I'm working on a prototype set of stainless pushrod tubes.
Advantages:
Precision machined heavy duty ends for greatly improved o-ring retention
Stop using paste sealants to keep oil from leaking at pr tube seals
Lower heat transfer than mild steel
Slightly smaller (3/4" od) tubes for better stub pipe clearance without need to dimple the pr tubes
Available in custom lengths, longer or shorter
Never rust out - never need replacement

I'm also considering using separate oil return hoses from both rocker boxes so that the pr tubes no longer have to handle that function.
That would allow the smallest possible tubes without the p-rods rubbing.
Machining the ends would be simplified, thereby lowering the cost of production.

(IMG:style_emoticons/default/shades.gif)
Your thoughts?

Edit 09/12/14: These are in Production. Go to Post #26 for add'l information.
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'73-914kid
post Feb 20 2014, 01:15 PM
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I wish you would have come out with these back when I still had my -4.....

I love the idea though. When I get another 914 with a -4, I'll buy a set.
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timothy_nd28
post Feb 20 2014, 01:19 PM
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God yes! (IMG:style_emoticons/default/pray.gif)
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michael7810
post Feb 20 2014, 01:19 PM
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I would be interested; especially if you could eliminate those wire thingies that are a PITA whenever I adjust the valves. I can't get my finger past them to feel is the stainless pushrod will spin (zero lash cold but the pushrod should spin is what I'm told to aim for).
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ChrisFoley
post Feb 20 2014, 01:42 PM
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QUOTE(michael7810 @ Feb 20 2014, 02:19 PM) *

... if you could eliminate those wire thingies ...

I'm still working on that part. (IMG:style_emoticons/default/smile.gif)
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Java2570
post Feb 20 2014, 02:03 PM
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I'd be interested in that!
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madmax914
post Feb 20 2014, 03:16 PM
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Any estimate of cost? I'm interested.
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ChrisFoley
post Feb 20 2014, 03:58 PM
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QUOTE(madmax914 @ Feb 20 2014, 04:16 PM) *

Any estimate of cost? I'm interested.

I haven't done any pricing yet.
I made CAD drawings yesterday.
My machinist started turning chips from a piece of round bar this afternoon.
I got lucky and found a piece of the exact tubing I had in mind, already in my shop.
We'll have a full set made up for testing by next week sometime. (IMG:style_emoticons/default/smile.gif)
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bandjoey
post Feb 20 2014, 04:51 PM
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Sound like a go for me. Appx production time ?
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r_towle
post Feb 20 2014, 07:26 PM
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I would be up for at least two sets if priced fair.
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Harpo
post Feb 20 2014, 07:33 PM
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Interesting (IMG:style_emoticons/default/popcorn[1].gif)
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mrbubblehead
post Feb 20 2014, 08:55 PM
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i would go for two sets, depending on price of coarse.
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McMark
post Feb 21 2014, 01:12 AM
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Sounds good!

Add something to ease PR tube removal. Grabbing them with pliers is effective, but damaging. (IMG:style_emoticons/default/wink.gif)
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ChrisFoley
post Feb 21 2014, 08:04 AM
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QUOTE(McMark @ Feb 21 2014, 02:12 AM) *

Add something to ease PR tube removal. Grabbing them with pliers is effective, but damaging. (IMG:style_emoticons/default/wink.gif)

What an excellent idea! Thanks. (IMG:style_emoticons/default/beerchug.gif)
We're already on it. And the feature will make installation easier as well, since the o-rings will be a little tighter.

Now I just have to figure out how to replace the wire bales with something more convenient. (IMG:style_emoticons/default/blink.gif)
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yeahmag
post Feb 21 2014, 03:36 PM
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I've always thought something welded to the valve cover would do the trick. I hate setting my valve lash and spinning the pushrods (for a loose "0") with the wired bales...

Then again, a simple clamp device at the head side of the pushrod tube would also keep it from sliding out.
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ChrisFoley
post Feb 21 2014, 04:22 PM
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Here's the first crude prototype.
Attached Image

Installed in our exhaust assembly fixture.
Attached Image

The flange is there for easier removal.
Attached Image

I'm not sure the flange is necessary. This thing is a lot sturdier than the stock pieces.
With just a little motor oil on the o-rings the tube presses in without much difficulty, and the shoulder on the large end may be exposed enough to push against for removal.

There's plenty of compression on the o-ring but the correctly shaped groove does an excellent job of supporting it.
I've pushed this tube in and out many times already, without being all that careful, and no sign of damage to the o-rings.

I was thinking a snap ring on the back side of the head might be suitable for retention, but there are too many engine variations possible. A small change in engine dimension might make that feature unusable.
Another idea was safety wire from the flange to the case but there's no good place on the crankcase for all the wires.
I also considered some kind of bar screwed to the case which overlaps the edge of all 4 holes at the small end of the tubes.
The wire bales will still work with these tubes.
Not sure what's best yet. Trying to keep it simple.
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ChrisFoley
post Mar 19 2014, 12:48 PM
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We're building a 2.5L track engine right now and the customer doesn't want any oil leaks,
so I've ordered material to make a pilot run.

Rather than make them all 3/4" od, part of each set will be 7/8" od.
The smaller tubes clear the exhaust stubs better and the larger tubes flow more oil.
My materials cost is within $0.05 per tube assembly between the two sizes so this doesn't have any effect on final price.

They will be initially priced at $240 per set of 8.
Custom lengths will be available for $20 more.

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Matt Romanowski
post Mar 19 2014, 01:06 PM
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Great work! Those look really nice and will be a great upgrade for anyone.
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Harpo
post Mar 19 2014, 05:33 PM
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Good evening Chris,

Is that $20 additional for the set, or each? BTW they look very nice.

Thanks

David
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ChrisFoley
post Mar 19 2014, 05:55 PM
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QUOTE(Harpo @ Mar 19 2014, 06:33 PM) *

Good evening Chris,

Is that $20 additional for the set, or each? BTW they look very nice.

Thanks

David

for the set (IMG:style_emoticons/default/smile.gif)

They won't be on the shelf, but as long as I keep some of the pieces in stock, unassembled, I can build a custom set without too much trouble.
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