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gcorrado
Samba Member
Joined: May 23, 2004
Posts: 27
Location: Bay Area, California
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 Posted: Wed Feb 06, 2008 3:22 am Post subject: |
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| tim240 wrote: |
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It actually looks as if it is blocking the complete hole
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That area between the oil gallery and the thinner part of the plug is what makes the restriction. |
yup.
the simple math john was talking about is that we can calculate the effective size of the orifice by computing the cross-sectional area of the gallery, and subtracting the cross-sectional area of the thinner part of the plug. since the oil has to squeeze between the two of them, it's the difference of those two areas that matter. now if we want to make our own single hole that has about the same flow, we just drill a hole in our NPT plug that has that same area as what we calculated. to be on the safe side we could increase it by 30% or so. |
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tim240
Samba Member
Joined: November 14, 2006
Posts: 176
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| Posted: Wed Feb 06, 2008 11:09 am Post subject: |
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we can calculate the effective size of the orifice by computing the cross-sectional area of the gallery, and subtracting the cross-sectional area of the thinner part of the plug. since the oil has to squeeze between the two of them, it's the difference of those two areas that matter. now if we want to make our own single hole that has about the same flow, we just drill a hole in our NPT plug that has that same area as what we calculated. to be on the safe side we could increase it by 30% or so.
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I thought about this route as well. I was also thinking that if the hole in the bearing is restrictive enough and only becomes a problem apon wear maybe the hole in the plug should be close to this size(not being subject to wear). |
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Jimmy111
Samba Member
Joined: October 05, 2006
Posts: 2643
Location: Wyoming
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| Posted: Wed Feb 06, 2008 11:31 am Post subject: |
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| Ok what you need is to take a piece of aluminum that will fit with a interferance fit in the hole in the bearing saddle. cut it to about 20mm in length and drill a 3mm hole in the center. use a 10mm drill bit and cut a concave survace where the hole is so it wont push up against the bearing and cut off flow. Push it into the oil gallery. The reason for the concave surface is that the hole in the bearing is about 2mm and it may not line up correctly with the hole that you drilled. |
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redhot
Samba Member
Joined: February 05, 2005
Posts: 447
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| Posted: Tue Feb 19, 2008 2:33 pm Post subject: |
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| tim240 wrote: |
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It actually looks as if it is blocking the complete hole
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I was at rimco picking up a case and asked them about said plug. They showed me a block cut in half to expose the oil galleries. That plug does cover the hole but only where the plug steps down. That area between the oil gallery and the thinner part of the plug is what makes the restriction. |
If someone could post pictures of such, it would be a great help and of course simply interesting![/i] |
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tim240
Samba Member
Joined: November 14, 2006
Posts: 176
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| Posted: Tue Feb 19, 2008 5:19 pm Post subject: |
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| I'll probably end up down at rimco for something in the next couple of weeks. When I go I'll bring my dig. camera and take a picture of the cut case where the oil gallery is. |
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neil68
Samba Member
Joined: March 17, 2007
Posts: 3440
Location: Calgary, Canada
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| Posted: Tue Feb 19, 2008 5:50 pm Post subject: #4 bearing oil supply |
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I've noticed that the more recent #4 OEM bearings have an even smaller oil hole. Is this perhaps a change designed to compensate for the new aluminum cases that may not have the stepped oil gallery plug, since some are already tapped for pipe plugs?
_________________
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 |
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bugninva
Samba Member
Joined: December 14, 2004
Posts: 8858
Location: sound it out.
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| Posted: Tue Feb 19, 2008 6:36 pm Post subject: |
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you guys want me to run to the basement and pull one of those plugs out? can get pictures and measurements...
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| [email protected] wrote: |
| With a show of hands, who has built over 1000 engines in the last 25 years? Anyone? |
GEX has. Just sayin |
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Jimmy111
Samba Member
Joined: October 05, 2006
Posts: 2643
Location: Wyoming
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| Posted: Tue Feb 19, 2008 7:09 pm Post subject: |
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| I have a drawing with the dimentions of the restrictor on page 11 of the other oil flow topic. |
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bugninva
Samba Member
Joined: December 14, 2004
Posts: 8858
Location: sound it out.
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| Posted: Tue Feb 19, 2008 8:00 pm Post subject: |
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| Jimmy111 wrote: |
| I have a drawing with the dimentions of the restrictor on page 11 of the other oil flow topic. |
Jimmy, i have posted your drawing below to answer the folks questions about size of the restrictor...hope this is okay.
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| [email protected] wrote: |
| With a show of hands, who has built over 1000 engines in the last 25 years? Anyone? |
GEX has. Just sayin |
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bugninva
Samba Member
Joined: December 14, 2004
Posts: 8858
Location: sound it out.
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| Posted: Tue Feb 19, 2008 8:09 pm Post subject: |
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the plug i just removed agrees with Jimmy's drawing.
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| [email protected] wrote: |
| With a show of hands, who has built over 1000 engines in the last 25 years? Anyone? |
GEX has. Just sayin |
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VeeDubya
Samba Member
Joined: April 18, 2006
Posts: 76
Location: Nederland, TX
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| Posted: Tue Feb 19, 2008 11:59 pm Post subject: |
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The restriction is not created by depth of the plug, but rather the orifice created. So ideally we'd want a longer (17mm) plug, threaded 1/16" NPT, necked down to 5.40 mm, to create the desired orifice. Correct?
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koolkarmakombi
Samba Member
Joined: June 26, 2007
Posts: 238
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| Posted: Wed Feb 20, 2008 5:58 pm Post subject: |
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| Jimmy111 wrote: |
| I have a drawing with the dimentions of the restrictor on page 11 of the other oil flow topic. |
Could you post a link to that post? Cant find it... |
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VeeDubya
Samba Member
Joined: April 18, 2006
Posts: 76
Location: Nederland, TX
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| Posted: Wed Feb 20, 2008 6:03 pm Post subject: |
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look 3 posts up
edit: sorry 4 posts up! 
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'65 Beetle
Last edited by VeeDubya on Wed Feb 20, 2008 6:36 pm; edited 1 time in total |
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neil68
Samba Member
Joined: March 17, 2007
Posts: 3440
Location: Calgary, Canada
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| Posted: Wed Feb 20, 2008 6:16 pm Post subject: #4 bearing |
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So, if the #4 bearing has a tiny oil hole, doesn't that act as a restrictor?
_________________
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 |
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VeeDubya
Samba Member
Joined: April 18, 2006
Posts: 76
Location: Nederland, TX
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| Posted: Wed Feb 20, 2008 6:38 pm Post subject: |
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I'd also like to hear of anyone who just plugged it with a NPT plug. Intereested if they experience the oil issues that have been described.
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bugninva
Samba Member
Joined: December 14, 2004
Posts: 8858
Location: sound it out.
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| Posted: Wed Feb 20, 2008 6:56 pm Post subject: |
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| VeeDubya wrote: |
| I'd also like to hear of anyone who just plugged it with a NPT plug. Intereested if they experience the oil issues that have been described. |
i have done several over the years with no oil problems at high rpms.... very high mileage i don't know....
_________________
| [email protected] wrote: |
| With a show of hands, who has built over 1000 engines in the last 25 years? Anyone? |
GEX has. Just sayin |
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VeeDubya
Samba Member
Joined: April 18, 2006
Posts: 76
Location: Nederland, TX
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| Posted: Wed Feb 20, 2008 6:58 pm Post subject: |
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What has been said sounds logical and feasable, it's just amazing that this is the first time it's been mentioned... or at least the first time I've read it.
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A.J.Sims
Banned
Joined: December 11, 2003
Posts: 1016
Location: LowBugget.com 982 N Batavia A4 Orange Ca 92867
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| Posted: Wed Feb 20, 2008 7:26 pm Post subject: |
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I can show you a easy way with out making any parts and you can use the parts you have! Give me a call at the shop if you still need help.
714-639-4284 ask for A.J 
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Have tech questions? Need real help? Give us a call.
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MConstable
Samba Member
Joined: May 04, 2004
Posts: 1822
Location: Saint Charles IL
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| Posted: Wed Feb 20, 2008 8:40 pm Post subject: |
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C'mon now AJ...shoot us the info...stop teasing 
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1974 Thing |
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VeeDubya
Samba Member
Joined: April 18, 2006
Posts: 76
Location: Nederland, TX
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| Posted: Wed Feb 20, 2008 8:54 pm Post subject: |
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No doubt A.J.! 
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