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Re: Bob Hoover HVX mods on wbx?
Posted: Sun Apr 16, 2017 1:54 pm
by flyguyeddy
How would a person shim the hydro lifters for solid operation?
Re: Bob Hoover HVX mods on wbx?
Posted: Sun Apr 16, 2017 9:03 pm
by Piledriver
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.
Re: Bob Hoover HVX mods on wbx?
Posted: Sun Apr 16, 2017 9:12 pm
by Piledriver
AMBROSIA wrote: ↑Mon Apr 04, 2016 3:12 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.
Re: Bob Hoover HVX mods on wbx?
Posted: Wed Apr 19, 2017 8:36 am
by AMBROSIA
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.
Re: Bob Hoover HVX mods on wbx?
Posted: Tue Jan 15, 2019 9:29 am
by flyguyeddy
i recently drilled my case for these mods, and it seemed very easy. did the long drillbit hole first then drilled down to meet it. no breakout on the case, thankfully, though i do not know how thin the material is there
Re: Bob Hoover HVX mods on wbx?
Posted: Sat Mar 16, 2019 8:54 am
by andy198712
its always a risk with that, i did mine (t1) and angled the drill be as much as i could (very little) and only drilled the minimum needed.... defiantly the firs thing to do on a case before spending lots of money on it though
glad yours went well!
Re: Bob Hoover HVX mods on wbx?
Posted: Thu Apr 25, 2019 11:17 am
by flyguyeddy
Im now wondering if i should spend the money and have that impression welded some, just for safety’s sake.
Re: Bob Hoover HVX mods on wbx?
Posted: Fri Apr 08, 2022 8:39 pm
by dcd
I also had a problem in drilling oil gall on 1 and 2 cylinder side drilling with 6mm after that in other engine build I thought i can start to drill with 6mm for like 1cm after that i can continue drill with 4.5mm in this method I get oil flow and be away from damaging my engine block . By the way you can fix your case if you get damage it I've done it I will give inst. in my next chat.
Re: Bob Hoover HVX mods on wbx?
Posted: Thu Feb 23, 2023 2:39 pm
by Pascal
I’ve done the HVX mods to my WBX using hydro lifters. This was in a fresh rebuild and I’ve had oil consumption issues. I use about 1 liter every 700 to 1000km. I get deposits on my spark plugs that look like it’s oil getting by the valves. Has anyone else had oil consumption with the extra oil getting to the valve train? Thanks