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Bob, a question on the HVX mods
I was once again reading about the HVX mods on your blog site, http://bobhooversblog.blogspot.com/2.../hvx-mods.html And I remembered a question I meant to ask you long ago. It has become relevant in another discussion so I wanted to get some clarification. Regarding the grooving of the rocker shaft: http://bp0.blogger.com/_JU6RC7jJfRc/...HVX+ROCKER.jpg http://bp1.blogger.com/_JU6RC7jJfRc/...X+ROCKER+A.jpg http://bp1.blogger.com/_JU6RC7jJfRc/...CKER+SHAFT.jpg Q1: you groove only the shaft, not the inside bore of the rockers themselves? I assume the shaft is stronger and safer to groove, I wouldn't want to make the rockers any weaker. Q2: Why do you make that groove in the first place? I thought you were trying to solve the shaft galling problem? Doesn't that shortcut groove between rocker oil holes actually reduce the oil that is available for the UNDERSIDE of the shaft, where the most friction and wear occurs? You get more oil to the adjuster screw, which is fine of course, but at the cost of reducing shaft lubrication where it is needed most. Q3: if you do not use swivel head adjusters, what purpose does the last oil passage in the rocker have? Oil would only seep past the threads slowly, correct? You also mention cutting the underside of the rocker where the adjuster screw is. Is that to expose the oil passage or the groove in the adjuster screw, to release more oil out? The rocker design we have in mind has a solid flat foot pressing the valve, and the adjuster is at the pushrod end. I doubt that there are any oil passages at the valve end of the rocker since it has no moving parts. Here's an example of the rocker assembly in question: http://www.cbperformance.com/catalog.asp?ProductID=1371 I am specifically trying to prevent rocker wear and seizure in a high performance engine, where a bronze bushing is used between shaft and rocker. Needle bearing rockers are available (Bugpack, ugh) but I fear they create another problem, since needle bearings rely on constant, full rotation to survive, and here they would only be jerking back and forth a little bit. I would think they will eventually dig little grooves on the shaft where they ride back and forth. For example: front engine, rear wheel drive cars have their driveshaft mounted at an angle to the rear diff, to force the U-joint needle bearings to rotate (however slowly) when you drive, instead of just nervously jittering back and forth more or less in the same position. Also, needle bearings would leak oil past them faster, depriving the adjusters of oil. Any comments would be most appreciated... I already talked a customer out of needle bearing rockers, but I need to give him peace of mind about his second choice, the bronze bushing type. I'm recommending the HVX mods to him. Jan |
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Bob, a question on the HVX mods
Jan Andersson wrote:
> > I was once again reading about the HVX mods on your blog site, > > http://bobhooversblog.blogspot.com/2.../hvx-mods.html > > And I remembered a question I meant to ask you long ago. It has become > relevant in another discussion so I wanted to get some clarification. > > > Regarding the grooving of the rocker shaft: > > http://bp0.blogger.com/_JU6RC7jJfRc/...HVX+ROCKER.jpg > > > http://bp1.blogger.com/_JU6RC7jJfRc/...X+ROCKER+A.jpg > > > http://bp1.blogger.com/_JU6RC7jJfRc/...CKER+SHAFT.jpg > > > > Q1: you groove only the shaft, not the inside bore of the rockers > themselves? I assume the shaft is stronger and safer to groove, I > wouldn't want to make the rockers any weaker. > > Q2: Why do you make that groove in the first place? I thought you were > trying to solve the shaft galling problem? Doesn't that shortcut groove > between rocker oil holes actually reduce the oil that is available for > the UNDERSIDE of the shaft, where the most friction and wear occurs? You > get more oil to the adjuster screw, which is fine of course, but at the > cost of reducing shaft lubrication where it is needed most. > > Q3: if you do not use swivel head adjusters, what purpose does the last > oil passage in the rocker have? Oil would only seep past the threads > slowly, correct? You also mention cutting the underside of the rocker > where the adjuster screw is. Is that to expose the oil passage or the > groove in the adjuster screw, to release more oil out? The rocker design > we have in mind has a solid flat foot pressing the valve, and the > adjuster is at the pushrod end. I doubt that there are any oil passages > at the valve end of the rocker since it has no moving parts. > > Here's an example of the rocker assembly in question: > > http://www.cbperformance.com/catalog.asp?ProductID=1371 > > > > I am specifically trying to prevent rocker wear and seizure in a high > performance engine, where a bronze bushing is used between shaft and > rocker. Needle bearing rockers are available (Bugpack, ugh) but I fear > they create another problem, since needle bearings rely on constant, > full rotation to survive, and here they would only be jerking back and > forth a little bit. I would think they will eventually dig little > grooves on the shaft where they ride back and forth. For example: front > engine, rear wheel drive cars have their driveshaft mounted at an angle > to the rear diff, to force the U-joint needle bearings to rotate > (however slowly) when you drive, instead of just nervously jittering > back and forth more or less in the same position. Also, needle bearings > would leak oil past them faster, depriving the adjusters of oil. > > Any comments would be most appreciated... > I already talked a customer out of needle bearing rockers, but I need to > give him peace of mind about his second choice, the bronze bushing type. > I'm recommending the HVX mods to him. > > > Jan Ok so it was several questions, lol More on the rocker assembly I'm looking into now, if anyone is interested: http://www.scatvw.com/RockerArms.htm I would likely buy them from aircooled.net (Shameless plug for a good shop, lol) Jan |
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Bob, a question on the HVX mods
On Fri, 15 Feb 2008 17:43:50 +0100, Jan Andersson
> wrote: > > I was once again reading about the HVX mods on your blog site, > > http://bobhooversblog.blogspot.com/2.../hvx-mods.html > > And I remembered a question I meant to ask you long ago. It has become > relevant in another discussion so I wanted to get some clarification. > > > Regarding the grooving of the rocker shaft: > > http://bp0.blogger.com/_JU6RC7jJfRc/...HVX+ROCKER.jpg > > http://bp1.blogger.com/_JU6RC7jJfRc/...X+ROCKER+A.jpg > > http://bp1.blogger.com/_JU6RC7jJfRc/...CKER+SHAFT.jpg > > > Q1: you groove only the shaft, not the inside bore of the rockers > themselves? I assume the shaft is stronger and safer to groove, I > wouldn't want to make the rockers any weaker. > > Q2: Why do you make that groove in the first place? I thought you were > trying to solve the shaft galling problem? Doesn't that shortcut groove > between rocker oil holes actually reduce the oil that is available for > the UNDERSIDE of the shaft, where the most friction and wear occurs? You > get more oil to the adjuster screw, which is fine of course, but at the > cost of reducing shaft lubrication where it is needed most. > > Q3: if you do not use swivel head adjusters, what purpose does the last > oil passage in the rocker have? Oil would only seep past the threads > slowly, correct? You also mention cutting the underside of the rocker > where the adjuster screw is. Is that to expose the oil passage or the > groove in the adjuster screw, to release more oil out? The rocker design > we have in mind has a solid flat foot pressing the valve, and the > adjuster is at the pushrod end. I doubt that there are any oil passages > at the valve end of the rocker since it has no moving parts. > > Here's an example of the rocker assembly in question: > > http://www.cbperformance.com/catalog.asp?ProductID=1371 > > > > I am specifically trying to prevent rocker wear and seizure in a high > performance engine, where a bronze bushing is used between shaft and > rocker. Needle bearing rockers are available (Bugpack, ugh) but I fear > they create another problem, since needle bearings rely on constant, > full rotation to survive, and here they would only be jerking back and > forth a little bit. I would think they will eventually dig little > grooves on the shaft where they ride back and forth. For example: front > engine, rear wheel drive cars have their driveshaft mounted at an angle > to the rear diff, to force the U-joint needle bearings to rotate > (however slowly) when you drive, instead of just nervously jittering > back and forth more or less in the same position. Also, needle bearings > would leak oil past them faster, depriving the adjusters of oil. > > Any comments would be most appreciated... > I already talked a customer out of needle bearing rockers, but I need to > give him peace of mind about his second choice, the bronze bushing type. > I'm recommending the HVX mods to him. > > > Jan Needle bearings are used as piston pin bearings in a multitude of applications, no full rotation there.. J. -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ |
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Bob, a question on the HVX mods
P.J.Berg wrote:
> On Fri, 15 Feb 2008 17:43:50 +0100, Jan Andersson > > wrote: > >> >> I was once again reading about the HVX mods on your blog site, >> >> http://bobhooversblog.blogspot.com/2.../hvx-mods.html >> >> And I remembered a question I meant to ask you long ago. It has become >> relevant in another discussion so I wanted to get some clarification. >> >> >> Regarding the grooving of the rocker shaft: >> >> http://bp0.blogger.com/_JU6RC7jJfRc/...HVX+ROCKER.jpg >> >> >> http://bp1.blogger.com/_JU6RC7jJfRc/...X+ROCKER+A.jpg >> >> >> http://bp1.blogger.com/_JU6RC7jJfRc/...CKER+SHAFT.jpg >> >> >> >> Q1: you groove only the shaft, not the inside bore of the rockers >> themselves? I assume the shaft is stronger and safer to groove, I >> wouldn't want to make the rockers any weaker. >> >> Q2: Why do you make that groove in the first place? I thought you were >> trying to solve the shaft galling problem? Doesn't that shortcut >> groove between rocker oil holes actually reduce the oil that is >> available for the UNDERSIDE of the shaft, where the most friction and >> wear occurs? You get more oil to the adjuster screw, which is fine of >> course, but at the cost of reducing shaft lubrication where it is >> needed most. >> >> Q3: if you do not use swivel head adjusters, what purpose does the >> last oil passage in the rocker have? Oil would only seep past the >> threads slowly, correct? You also mention cutting the underside of the >> rocker where the adjuster screw is. Is that to expose the oil passage >> or the groove in the adjuster screw, to release more oil out? The >> rocker design we have in mind has a solid flat foot pressing the >> valve, and the adjuster is at the pushrod end. I doubt that there are >> any oil passages at the valve end of the rocker since it has no moving >> parts. >> >> Here's an example of the rocker assembly in question: >> >> http://www.cbperformance.com/catalog.asp?ProductID=1371 >> >> >> >> I am specifically trying to prevent rocker wear and seizure in a high >> performance engine, where a bronze bushing is used between shaft and >> rocker. Needle bearing rockers are available (Bugpack, ugh) but I fear >> they create another problem, since needle bearings rely on constant, >> full rotation to survive, and here they would only be jerking back and >> forth a little bit. I would think they will eventually dig little >> grooves on the shaft where they ride back and forth. For example: >> front engine, rear wheel drive cars have their driveshaft mounted at >> an angle to the rear diff, to force the U-joint needle bearings to >> rotate (however slowly) when you drive, instead of just nervously >> jittering back and forth more or less in the same position. Also, >> needle bearings would leak oil past them faster, depriving the >> adjusters of oil. >> >> Any comments would be most appreciated... >> I already talked a customer out of needle bearing rockers, but I need >> to give him peace of mind about his second choice, the bronze bushing >> type. >> I'm recommending the HVX mods to him. >> >> >> Jan > > Needle bearings are used as piston pin bearings in a multitude of > applications, no full rotation there.. > > J. > > > like in my ex moped didn't think of that. |
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Bob, a question on the HVX mods
On Sat, 16 Feb 2008 02:23:38 +0100, Jan Andersson
> wrote: > P.J.Berg wrote: >> On Fri, 15 Feb 2008 17:43:50 +0100, Jan Andersson >> > wrote: >> >>> >>> I was once again reading about the HVX mods on your blog site, >>> >>> http://bobhooversblog.blogspot.com/2.../hvx-mods.html >>> >>> And I remembered a question I meant to ask you long ago. It has become >>> relevant in another discussion so I wanted to get some clarification.. >>> >>> >>> Regarding the grooving of the rocker shaft: >>> >>> http://bp0.blogger.com/_JU6RC7jJfRc/...HVX+ROCKER.jpg >>> http://bp1.blogger.com/_JU6RC7jJfRc/...X+ROCKER+A.jpg >>> http://bp1.blogger.com/_JU6RC7jJfRc/...CKER+SHAFT.jpg >>> >>> Q1: you groove only the shaft, not the inside bore of the rockers >>> themselves? I assume the shaft is stronger and safer to groove, I >>> wouldn't want to make the rockers any weaker. >>> >>> Q2: Why do you make that groove in the first place? I thought you were >>> trying to solve the shaft galling problem? Doesn't that shortcut >>> groove between rocker oil holes actually reduce the oil that is >>> available for the UNDERSIDE of the shaft, where the most friction and >>> wear occurs? You get more oil to the adjuster screw, which is fine of >>> course, but at the cost of reducing shaft lubrication where it is >>> needed most. >>> >>> Q3: if you do not use swivel head adjusters, what purpose does the >>> last oil passage in the rocker have? Oil would only seep past the >>> threads slowly, correct? You also mention cutting the underside of the >>> rocker where the adjuster screw is. Is that to expose the oil passage >>> or the groove in the adjuster screw, to release more oil out? The >>> rocker design we have in mind has a solid flat foot pressing the >>> valve, and the adjuster is at the pushrod end. I doubt that there are >>> any oil passages at the valve end of the rocker since it has no moving >>> parts. >>> >>> Here's an example of the rocker assembly in question: >>> >>> http://www.cbperformance.com/catalog.asp?ProductID=1371 >>> >>> >>> >>> I am specifically trying to prevent rocker wear and seizure in a high >>> performance engine, where a bronze bushing is used between shaft and >>> rocker. Needle bearing rockers are available (Bugpack, ugh) but I fear >>> they create another problem, since needle bearings rely on constant, >>> full rotation to survive, and here they would only be jerking back and >>> forth a little bit. I would think they will eventually dig little >>> grooves on the shaft where they ride back and forth. For example: >>> front engine, rear wheel drive cars have their driveshaft mounted at >>> an angle to the rear diff, to force the U-joint needle bearings to >>> rotate (however slowly) when you drive, instead of just nervously >>> jittering back and forth more or less in the same position. Also, >>> needle bearings would leak oil past them faster, depriving the >>> adjusters of oil. >>> >>> Any comments would be most appreciated... >>> I already talked a customer out of needle bearing rockers, but I need >>> to give him peace of mind about his second choice, the bronze bushing >>> type. >>> I'm recommending the HVX mods to him. >>> >>> >>> Jan >> Needle bearings are used as piston pin bearings in a multitude of >> applications, no full rotation there.. >> J. >> > > > like in my ex moped > > didn't think of that. And 100cc Go-kart engines turning 18K+ J. -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ |
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Bob, a question on the HVX mods
On Feb 15, 8:43 am, Jan Andersson >
wrote: > Q1: you groove only the shaft, not the inside bore of the rockers > themselves? ------------------------------------------------------------------------- Using the lathe, I groove the rocker-arm shafts in the locations shown. Inside the rockers, I use a Dremel tool (or similar) and a carbide burr to CONNECT the two oil passages. -------------------------------------------------------------------------- > Q2: Why do you make that groove in the first place? I thought you were > trying to solve the shaft galling problem? Doesn't that shortcut groove > between rocker oil holes actually reduce the oil that is available for > the UNDERSIDE of the shaft, where the most friction and wear occurs? You > get more oil to the adjuster screw, which is fine of course, but at the > cost of reducing shaft lubrication where it is needed most. ---------------------------------------------------------------------------- The HVX mods begin with a full-flow oil filter. Then the crankcase is modified so as to INCREASE the amount of oil reaching the heads by eight-fold. There is no sense in making mods to the valve train until you have made the mods to ensure an adequate flow of lubricant to the heads. --------------------------------------------------------------------------------- > Q3: if you do not use swivel head adjusters... --------------------------------------------------------------------------------- The full set of HVX drawings is NOT included in the blog. The HVX mods includes the use of the Soobie/Ford type swivel-foot adjuster, for which the adjuster-end of the rocker-arm must be thinned down... as shown in the drawing you've cited. All tolled, there's about 125 CAD drawings, a bit much for the blog. But every time I've posted them publicly someone starts flogging them on eBay. I'm trying to get all of this information into a POD book but the size of the book (more than 3 Megs) and the small size of the market (ie, there's not that many owners of air-coolled VW's) makes it a tough sell. ---------------------------------------------------------------------------------------- > Any comments would be most appreciated... ---------------------------------------------------------------------------------------- It is a waste of time to do ONLY the valve-train mods -- there simply isn't enough oil to do the job. The key is to get more oil out to the heads. Once you've done that, you'll see the need for the grooved rocker-arm and connecting the oil channels in the rockers. The internal oil channel in the Ford/Soobie-type adjusters allows them to function as SPRAY BARS, allowing the extra oil to pick up a lot more heat. As for the grooves and other mods, you will find their functional equivalent inside EVERY modern-day engine (including the Type IV). The lubrication system was marginal in the 1300. For larger engines operating at higher rpm, you have to go back to basics and resolve the root problem. A big advantage of doing so is that once you've provided more oil to the heads you will eliminate the snapping hair- pins, worn washers and galled rocker shafts, which means you can leave all that expensive after-market valve-train stuff on the counter. -Bob Hoover |
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Bob, a question on the HVX mods
On Sat, 16 Feb 2008 02:37:11 +0100, Veeduber > wrote:
> On Feb 15, 8:43 am, Jan Andersson > > wrote: > >> Q1: you groove only the shaft, not the inside bore of the rockers >> themselves? > ------------------------------------------------------------------------- > Using the lathe, I groove the rocker-arm shafts in the locations > shown. Inside the rockers, I use a Dremel tool (or similar) and a > carbide burr to CONNECT the two oil passages. > > -------------------------------------------------------------------------- > >> Q2: Why do you make that groove in the first place? I thought you were >> trying to solve the shaft galling problem? Doesn't that shortcut groove >> between rocker oil holes actually reduce the oil that is available for >> the UNDERSIDE of the shaft, where the most friction and wear occurs? You >> get more oil to the adjuster screw, which is fine of course, but at the >> cost of reducing shaft lubrication where it is needed most. > > ---------------------------------------------------------------------------- > > The HVX mods begin with a full-flow oil filter. Then the crankcase > is modified so as to INCREASE the amount of oil reaching the heads by > eight-fold. There is no sense in making mods to the valve train until > you have made the mods to ensure an adequate flow of lubricant to the > heads. > --------------------------------------------------------------------------------- > >> Q3: if you do not use swivel head adjusters... > > --------------------------------------------------------------------------------- > > The full set of HVX drawings is NOT included in the blog. The HVX mods > includes the use of the Soobie/Ford type swivel-foot adjuster, for > which the adjuster-end of the rocker-arm must be thinned down... as > shown in the drawing you've cited. > > All tolled, there's about 125 CAD drawings, a bit much for the blog. > But every time I've posted them publicly someone starts flogging them > on eBay. I'm trying to get all of this information into a POD book > but the size of the book (more than 3 Megs) and the small size of the > market (ie, there's not that many owners of air-coolled VW's) makes it > a tough sell. > > ---------------------------------------------------------------------------------------- > >> Any comments would be most appreciated... > > ---------------------------------------------------------------------------------------- > > It is a waste of time to do ONLY the valve-train mods -- there simply > isn't enough oil to do the job. The key is to get more oil out to the > heads. Once you've done that, you'll see the need for the grooved > rocker-arm and connecting the oil channels in the rockers. The > internal oil channel in the Ford/Soobie-type adjusters allows them to > function as SPRAY BARS, allowing the extra oil to pick up a lot more > heat. > > As for the grooves and other mods, you will find their functional > equivalent inside EVERY modern-day engine (including the Type IV). > > The lubrication system was marginal in the 1300. For larger engines > operating at higher rpm, you have to go back to basics and resolve the > root problem. A big advantage of doing so is that once you've > provided more oil to the heads you will eliminate the snapping hair- > pins, worn washers and galled rocker shafts, which means you can leave > all that expensive after-market valve-train stuff on the counter. > > -Bob Hoover Any chance of buying a set directly from you, payable via PayPal(f.ex.) ? Either paper copies, pdf's or any other format you find handy. Not that I need them currently, would like to store/save/conserve(you get the idea) for the future though, along with the Sermons. Jørn. > > > > > -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ |
#8
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Bob, a question on the HVX mods
On Feb 15, 6:18 pm, "P.J.Berg" > wrote:
> > > Any chance of buying a set directly from you, ------------------------------------------------------------------------- No. While the lubrication mods are about 3Mb, the complete file is over 12Mb. Contact me directly. With a valid email address. -Bob |
#9
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Bob, a question on the HVX mods
On Sat, 16 Feb 2008 04:46:28 +0100, Veeduber > wrote:
> On Feb 15, 6:18 pm, "P.J.Berg" > wrote: >> >> >> Any chance of buying a set directly from you, > > ------------------------------------------------------------------------- > > No. While the lubrication mods are about 3Mb, the complete file is > over 12Mb. > > Contact me directly. With a valid email address. > > -Bob > > Will do. I will keep the subject line the same as above, I know you do not like unsolicited e-mail.. J. -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ |
#10
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Bob, a question on the HVX mods
On Sat, 16 Feb 2008 05:42:11 +0100, P.J.Berg >
wrote: > On Sat, 16 Feb 2008 04:46:28 +0100, Veeduber > wrote: > >> On Feb 15, 6:18 pm, "P.J.Berg" > wrote: >>> >>> >>> Any chance of buying a set directly from you, >> >> ------------------------------------------------------------------------- >> >> No. While the lubrication mods are about 3Mb, the complete file is >> over 12Mb. >> >> Contact me directly. With a valid email address. >> >> -Bob >> >> > > Will do. > > I will keep the subject line the same as above, I know you do not like > unsolicited e-mail.. > > J. > > > Thanx Bob. J. -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ |
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