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Thu Jan 31, 2019 11:18 am

I haven’t been able to find anyone to do the mods to my case, sucks because I don’t trust myself to do them

Thu Jan 31, 2019 12:55 pm

MConstable wrote: I haven’t been able to find anyone to do the mods to my case, sucks because I don’t trust myself to do them

If I can do it, you can do it.
Caliper, drill bits, care and guts, that's all..

Measure twice, cut once.
You will probably do a better job than 80% of the people who would take your money to do it.

Thu Jan 31, 2019 1:01 pm

Clatter wrote: You will probably do a better job than 80% of the people who would take your money to do it.

About the best bit of advice. Study success stories on here thoughtfully, and do it yourself. You'll be fine.

Remember, when you're building your engine your goal is to have something really nice you're proud of that you can trust, at the expense of any time necessary to do that so you can sleep at night.

When someone else is building your engine, their goal, in general, is to get it done reasonably quickly and do just enough to make it decently reliable, and no more. The less you pay for the work the more truth this holds.

Take your time, do it yourself, be proud. I'm actually tooling up to do a similar thing now because no aircooled shop in a few hundred mile radius will prep my case spigots right for 94mm cylinders, and I want it right.

Fri Feb 01, 2019 10:10 am

I've done the mod to a few of my engines for my racecar. I've found No negatives about it. Just drilled another one yesterday. It's really not a big deal.
I'm also running 14-24 Hour long Endurance races, where we are really beating on the poor thing on every lap with. Each time I've torn down the engines, the cam and lifters have been beautiful.
I''m also running Brad Penn oil.
I'm Sold on it.

Mon Sep 23, 2019 9:47 pm

Did mine tonight. As others have said, take it slow and you will be fine. Only caveat I will give you is some of the old cases have a deep relief in the side of the case. Stay away from those for this mod. You can do it!

Tue Sep 24, 2019 6:46 pm

Who are those guys??????

I did mine by myself as well. No issues. I did take it slow and cleared the bit quite often to see where I was drilling...
Here are some pics of mine if it helps you any...

Wed Sep 25, 2019 4:10 am

Probably a dumb question, but do you need to modify the oil hole in the cam bearings when doing these mods?

Wed Sep 25, 2019 4:27 am

txoval wrote: Probably a dumb question, but do you need to modify the oil hole in the cam bearings when doing these mods?

https://bobhooversblog.blogspot.com/2007/05/hvx-mods.html

Wed Sep 25, 2019 6:02 am

txoval wrote: Probably a dumb question, but do you need to modify the oil hole in the cam bearings when doing these mods?

I haven't and the difference in the amount of oil supplied to the head is remarkable.

brad

Wed Sep 25, 2019 8:42 pm

Not usually this guy, but the group photo above is the wrong Bob Hoover. Interesting coincidence that both of them were interested in planes, but the one pictured is the famous pilot, and "our Bob" was a small aircraft pilot/tinkerer. I don't think esteemed pilot Bob above did much VW work. Both absolute champs though. RIP, keep on flyin' and tinkerin'

Sat Sep 28, 2019 4:45 am

jimmyhoffa wrote: Not usually this guy, but the group photo above is the wrong Bob Hoover. Interesting coincidence that both of them were interested in planes, but the one pictured is the famous pilot, and "our Bob" was a small aircraft pilot/tinkerer. I don't think esteemed pilot Bob above did much VW work. Both absolute champs though. RIP, keep on flyin' and tinkerin'

Thank you for clarifying that. It is great that they shared the love of aviation. The VW engine has been iconic in many walks of life.

Sat Sep 28, 2019 7:32 am

A note to the diy Guy.
Some time ago I drilled through a pristine case because I did not look closely before I began to drill. After that stupid mistake I had a closer look at the cases. Now I tilt the vertilcal angle 1 to 1,5 degrees inward. That leaves significantly more material in the weak spot.. Never had a problem since.

Sat Sep 28, 2019 8:27 am

Hoover mod video.
https://www.youtube.com/watch?v=ubwhsLNM1wU

Sat Sep 28, 2019 1:32 pm

I always drill mine at a angle. and always slot the lifter bores about 1/4~5/16"outward and 1/4"~5/16" inward from each oil gally hole about1.5~ 2mm wide&1~1.5mm deep to get full tyme rocker oiling not tymed spirt&squirt. I like big pumps and lotsa oil flow to the heads. More oil to the heads = less oil releaved by the oil pressure relief valve. and cooler heads, cooler rockers,cooler valve springs, cooler pushrods. it's just plain cool. and longer valve adjustments intervals if the rest is right.
I do not like lifter bores with a full circle gally around the ID of them...unless the slots are also added.

Sat Sep 28, 2019 7:05 pm

Mine is also drilled at an angle to avoid the case dimple.
This pic was taken at an angle that exaggerates the angle of the drilling, but does show what is meant by "drilled at an angle".

Mon Sep 30, 2019 7:27 am

I just performed these mods this weekend (case and lifter mods that is. Rockers coming this week). I will admit, my anxiety level was pretty high drilling and grinding on a customer's brand new AS41 case, but that being said, it was really easy to do and that case had plenty of material to do it.

Mon Sep 30, 2019 2:11 pm

I also widen & slightly deepen the groove on the non notch sides of the grooves. ( stroker clearanceing comes real close to the knotch so not groove neer the knotch's as you dont want a oil pressure lkkek inside as it wont show up as a leek, just lost wasted lower oil pressure. As well as enlarge the oil feed gally to the cam towere between cyl 3&4.then tap%plug it for cleaning out if ever needed.

Tue Oct 01, 2019 3:15 am

The wisdom of Bob Hoover
https://documentcloud.adobe.com/link/track?uri=urn...b8b936bc75

https://documentcloud.adobe.com/link/track?uri=urn...b7711a9c57

Wed Oct 02, 2019 5:07 pm

greggholmes wrote: The wisdom of Bob Hoover
https://documentcloud.adobe.com/link/track?uri=urn...b8b936bc75

https://documentcloud.adobe.com/link/track?uri=urn...b7711a9c57
Thanks for posting this info. :)

Sun Oct 13, 2019 3:23 pm

Would this be something Fat/Rimco could perform?