Bob Hoover HVX mods on wbx?

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flyguyeddy
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Re: Bob Hoover HVX mods on wbx?

Post by flyguyeddy » Sun Apr 16, 2017 3:54 pm

How would a person shim the hydro lifters for solid operation?

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Piledriver
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Re: Bob Hoover HVX mods on wbx?

Post by Piledriver » Sun Apr 16, 2017 11:03 pm

With a machined plug to replace the guts, aluminum should work if you can keep the steel cup for the pushrod.
Non-trivial unless you have a handy machine shop.
I'd suggest another set of lifters, and sell the ones you have if still new.

T1 lifters with a groove around the inserts (ID or OD) would work at least as well.
I, for one, regularly embrace our new robot overlords, as I am the guy fixing the robots...

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Piledriver
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Re: Bob Hoover HVX mods on wbx?

Post by Piledriver » Sun Apr 16, 2017 11:12 pm

AMBROSIA wrote:
Mon Apr 04, 2016 5:12 am
Why only one oiling groove?
Will this not restrict the flow similarly to a non modified type 1 lifter?
All the tool steel light weight lifters I have seen are the same design.
The groove is larger than one of the single stock ones but certainly much smaller than a hydro lifter.
I'm thinking it would be easier to modify the bushes by perhaps adding a chamfer to the oiling holes?
...

I'm still unable to move forward as the lifter/bush combinations I tried so far are all out of spec.
One view is that there is insufficient 'crush' from the existing bores due to wear.
Have them knurled and press them in smothered with green (bushings) locktite.
They won't go anywhere. The knurling increases the effective OD.

You could easily cut oil passage grooves around the bushing ID or OD, taking the lifter out of the feed path.
I, for one, regularly embrace our new robot overlords, as I am the guy fixing the robots...

AMBROSIA
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Re: Bob Hoover HVX mods on wbx?

Post by AMBROSIA » Wed Apr 19, 2017 10:36 am

In the end I went with Porsche 912 bushes drilled and honed to match my lifters.
I really like the nice oil groove feature on the od that gives 100% oil flow unlike the normal T1 setup.
Additionally, I enlarged the existing oil holes to match the 7mm gallery bore.

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