Mods for better lifter and rocker lubrication..

[ALB]

Has any one done the Bob Hoover lifter,case and rocker mods for better lifter and rocker lubrication?

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

I know lots of guys have done the lifter mod (Berg used to sell modified lifters) but has anyone done everything? Any comments?
_________________
On a lifelong mission to prove (much to my wife's dismay) that Immaturity is Forever!!

[Almost Alive]

I had a well known company tell me "that book must be 20+ years old, a good read but shouldn't be taken for more than that" which I'm really not sure I agree with.

[rsorak]

Bob's a sharp guy if he says it's good I trust him.
_________________
Rick '71 Westfalia & '73 Thing

[ALB]

[neil68]

I see this "old book" reason posted from time to time on the internet...however, think about it first. If you have a stock-style ACVW engine, then chances are that in many cases you still have basically 40-year-old technology-ie. mag engine case, flat tappets, VW crank, rods, Mahle pistons, etc, so the base engine is still the same, for the most part. You have to really analyze your combo, to see what makes sense.

If you've got an aftermarket case, then it's a different story...
_________________
Neil.

Der Kleiner Rennwagens
68 Beetle 2332 cc, 204 WHP
12.5 seconds @ 107 mph
Dynojet Test: https://www.youtube.com/watch?v=M9B_H3eklAo

[ALB]

[Jimmy111]

I did the lifter modification quite often. Many of the VW motors I built were to operate machinery and ran untill they burnt up. The lifter mod does help to keep the lifter bores round if they are round in the first place. But the biggest advantage is more oil and cooling to the head and valve springs. You can run higher comopression and your springs last much longer.

[Unkl Ian]

[theastronaut]

I'll be performing the Hoover oiling mods to my 2110 when I build it. Will be using Pauter roller rockers and after reading up on them, the valve springs really need the extra oil in the rocker box to keep the springs cool when using Pauter style rockers. I'll be doing a detailed build thread; ill try to show some pics of the mods when I get that far with it.

Jimmy, do you know how much the head temps dropped when you did the lifter mods? And as mentioned in Bob Hoover's blog, did you see increased oil temps and, if so, how much higher were they? I had run across Hoover's blog a few weeks ago on the oiling mods, but it didn't cross my mind that with the decrease in head temps, the compression ratio could be increased. Interesting way to cool the heads and valve springs while increasing lifter, rocker, and valve spring life.
_________________
Strive for perfection in everything. Take the best that exist and make it better. If it doesn't exist, create it. Accept nothing nearly right or good enough."
-Sir Henry Royce, co-founder of Rolls-Royce

'64 Beetle Sunroof OG Bahama Blue
'63 Beetle Vert
'66 Beetle
'88 Festiva L
'89 Festiva L
'64 Chevy C10
'66 Chevy C10

[ralf]

[Marv [UK]]

At some point in the future I intend making a motor with all the hvx mods but at the moment it's beyond my current tool capability.

The mod that is the most interesting is the increase of oil to the right hand case half with the additional cross drilling. I would be most interested in doing this.

Some of the mods have been already done by the aftermarket parts venders. For example scat bolt up rocker shafts already have the oiling groove. As for the accuracy of the groove location remains to be seen.

Bob Hoover was quite explicit though, it's pointless doing just one or two of the mods.... all have to be done to see the effects he wrote about

[Sigurd]

I just saw this article a few days ago and it has me thinking. Is this a common thing that people do? Does every builder do this? I'm using Scat 1.25 rockers and Udo's lifters. I know the Scat rockers have an oil passage from the cup through the arm to the shaft. If a lifter has two grooves, does it need to be modified further? I'm also not too keen on drilling through my brand-new bronze sleeves...

[Lawrence_0485]

if the above mods are done, could you expect to see lower head temps from the added oil flow?

[nsracing]

I will show you a better oil wash for the lifters. I machine 2 nipples and holes at 45 degrees to spray oil on the lifter contact areas. YOu only do one side as the oil will roll all the way around.

And you do not need to gouge out the case for it. The nipples go between the lifters bosses and tap the galley there.

I also found piston squirt nipples to tap into the case main webs. And the donor part is everywhere in the VW swaps...stuff nobody cares for.

[GDOG57]

The Corvair engines have a small hole(.024) in the side of the pushrod to lubricate the rockers and springs. As the pushrod actuates the rocker and valve, it rotates,spraying oil out the hole lubricating everything in the valve cover. Which is six pushrods in this case,per side.

I am going to try this method with my next engine build.
_________________
'57 oval window deluxe,Agave green(L240) 2276cc w/51.5 IDA's
'57 type 2 panel ( L31 dove blue) project daily driver,Singleport 1955cc
'69 Squareback (L30A Royal Red)

[bugninva]

spraybars....
_________________

[Jimmy111]

[Sigurd]

What exactly are you cutting out of the lifters? Sorry, I can't see Hoover's pics right now.

[Alamitos Bays]

I bet the poster was referring to Muir's book.

[74 Thing]

You cut a groove between the two oil channels that wrap around the lifer so oil is available all the time not just during certain points when the cam pushes the lifter and aligns it with the oil hole in the case.

If you have your case bushed most places offer a modification where a groove is cut into the bronze bushing so that the oil will flow all the time instead of having to modify the lifter.

I am not sure I would cut the groove in the Udo lifters just do to cost without first discussing it with Udo.