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gregb
Samba Member
Joined: March 22, 2006
Posts: 114
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 Posted: Wed Feb 27, 2019 8:38 am Post subject: What is this Nefarious Notch? |
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I have a engine case with this particular notch under the oil cooler. What is it for? I have also seen some cases with it filled in.
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Dan Ruddock
Samba Member
Joined: October 25, 2012
Posts: 3594
Location: Sarasota, in my adopted state of Florida
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| Posted: Wed Feb 27, 2019 8:44 am Post subject: Re: What is this Nefarious Notch? |
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Reduces weight and material needed in casting the case.
Dan |
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gregb
Samba Member
Joined: March 22, 2006
Posts: 114
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| Posted: Wed Feb 27, 2019 8:50 am Post subject: Re: What is this Nefarious Notch? |
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| Dan Ruddock wrote: |
Reduces weight and material needed in casting the case.
Dan |
Thanks Dan. I've used probably 1/2 dozen other cases in my day and never saw this 'Notch'. The one I have now is from a Super Beetle so its probably just a newer version. Case stamp starts with an "AK". |
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NJ John
Samba Member
Joined: September 21, 2007
Posts: 2224
Location: HdG, MD & NJ
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| Posted: Wed Feb 27, 2019 10:51 am Post subject: Re: What is this Nefarious Notch? |
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I just cleaned a mud wasp nest out of one last week. And I'm not joking.
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gregb
Samba Member
Joined: March 22, 2006
Posts: 114
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| Posted: Wed Feb 27, 2019 12:10 pm Post subject: Re: What is this Nefarious Notch? |
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| NJ John wrote: |
| I just cleaned a mud wasp nest out of one last week. And I'm not joking. |
Hillarious and I believe you. I've found all sorts of weird things when taking down a long block. I think one guy on here found a small toy fireman's hat in his fuel pump! |
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nsracing
Samba Member
Joined: November 16, 2003
Posts: 9481
Location: NOVA
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| Posted: Thu Feb 28, 2019 10:58 pm Post subject: Re: What is this Nefarious Notch? |
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That hole is for inserting the silencer so the engine will be quiet.  |
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mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
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| Posted: Fri Mar 01, 2019 11:25 am Post subject: Re: What is this Nefarious Notch? |
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probably just for the end of the gally so some moron dosent drill all the way through.....and make a real bypass for the cooler  |
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outcaststudios
Samba Member
Joined: February 09, 2015
Posts: 1732
Location: Maine
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| Posted: Fri Mar 01, 2019 6:09 pm Post subject: Re: What is this Nefarious Notch? |
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| Dan Ruddock wrote: |
Reduces weight and material needed in casting the case.
Dan |
its not for that , if it was added for the casting it would be to relieve shrinkage or heat propagation in that area (used in a dense area deep inside of castings) that cant cool fast enough and causes long crystal formation cycles, resulting in hot tearing. but it looks like its got a mechanical purpos, i guess the casting could be hot enough there that that area needed it but its a lot of trouble to cover for a mistake.hmm...
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modok
Samba Member
Joined: October 30, 2009
Posts: 26790
Location: Colorado Springs
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| Posted: Fri Mar 01, 2019 6:40 pm Post subject: Re: What is this Nefarious Notch? |
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| bingo |
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mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
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| Posted: Sat Mar 02, 2019 11:34 am Post subject: Re: What is this Nefarious Notch? |
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| probably a machine location fixture mount hole. |
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modok
Samba Member
Joined: October 30, 2009
Posts: 26790
Location: Colorado Springs
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| Posted: Sat Mar 02, 2019 1:32 pm Post subject: Re: What is this Nefarious Notch? |
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They had a problem with porosity in that area.
Some cases from the late 60's, the oil passage from the cooler down between the cylinders is sleeved with an aluminum tube, but you don't see that in late 70's cases. Adding that relief might have been part of fighting that problem. |
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