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northernopposition Samba Member
Joined: February 14, 2007 Posts: 59 Location: fairbanks, alaska
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Posted: Fri Feb 03, 2023 1:22 pm Post subject: Dual port heads on single port case |
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Quick question here: I know the middle two upper case studs need to be changed to accept dual port heads but can someone just tell me what length they are supposed to be? I have some extra studs kicking around and I’m hoping I have some. I’m feeling doubtful that I do so if have 4 you want to sell……
Thanks.
Last edited by northernopposition on Fri Feb 03, 2023 3:31 pm; edited 1 time in total |
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Dan Ruddock Samba Member
Joined: October 25, 2012 Posts: 3577 Location: Sarasota, in my adopted state of Florida
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Posted: Fri Feb 03, 2023 1:45 pm Post subject: Re: Dual port heads on single port case |
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184mm |
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northernopposition Samba Member
Joined: February 14, 2007 Posts: 59 Location: fairbanks, alaska
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Posted: Fri Feb 03, 2023 3:29 pm Post subject: Re: Dual port heads on single port case |
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Thanks! |
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northernopposition Samba Member
Joined: February 14, 2007 Posts: 59 Location: fairbanks, alaska
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Posted: Sat Feb 11, 2023 2:40 pm Post subject: Re: Dual port heads on single port case |
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Would it be stupid to cut the slightly longer SP studs and rethread them? |
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Cusser Samba Member
Joined: October 02, 2006 Posts: 31276 Location: Hot Arizona
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Posted: Sat Feb 11, 2023 4:17 pm Post subject: Re: Dual port heads on single port case |
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northernopposition wrote: |
Quick question here: I know the middle two upper case studs need to be changed to accept dual port heads |
I did just that in 1976 when I made a 1970 single port "B" engine into dual port.
But I bought 4 shorter studs, likely at the dealer back then. I'm still using the single port tins that I cut/made fit back then, and have used DP tins waiting until if/when that 1835cc engine comes apart. _________________ 1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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modok Samba Member
Joined: October 30, 2009 Posts: 26744 Location: Colorado Springs
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Posted: Sat Feb 11, 2023 5:35 pm Post subject: Re: Dual port heads on single port case |
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The threads are rolled onto the stud, not cut.
The diameter is not large enough to cut more threads. But you could maybe use spacers.
Maybe could roll more threads on it if you have a thread rolling machine.
A full sets of head studs are reasonably priced.
Maybe it's time for fresh ones. |
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northernopposition Samba Member
Joined: February 14, 2007 Posts: 59 Location: fairbanks, alaska
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Posted: Sat Feb 11, 2023 7:23 pm Post subject: Re: Dual port heads on single port case |
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That makes sense. I’ll quit trying to be cheap and just do it right. Thanks. |
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nsracing Samba Member
Joined: November 16, 2003 Posts: 9437 Location: NOVA
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Posted: Mon Feb 13, 2023 8:03 am Post subject: Re: Dual port heads on single port case |
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I have never heard of singleport case. Only heads -
Single-relief case -sure.
He must mean muffler bearings. |
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northernopposition Samba Member
Joined: February 14, 2007 Posts: 59 Location: fairbanks, alaska
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Posted: Mon Feb 13, 2023 8:46 am Post subject: Re: Dual port heads on single port case |
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Meaning a dual relief case that came with single port heads, thus having longer upper middle studs than the same case that came with dual port heads. |
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Cusser Samba Member
Joined: October 02, 2006 Posts: 31276 Location: Hot Arizona
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Posted: Mon Feb 13, 2023 8:57 am Post subject: Re: Dual port heads on single port case |
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northernopposition wrote: |
Meaning a dual relief case that came with single port heads, thus having longer upper middle studs than the same case that came with dual port heads. |
Yes. I made my 1970 dual relief case into dual port, and 1835cc. _________________ 1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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Erik G Samba Member
Joined: October 16, 2002 Posts: 13247 Location: Tejas!
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Dauz Samba Member
Joined: January 05, 2010 Posts: 1790
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Posted: Mon Feb 13, 2023 10:48 am Post subject: Re: Dual port heads on single port case |
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The doc put a camera in the single relief outlet in the rear "case" and proceeded to tell me there's diverticulosis near the exhaust and that I need to consider what goes in the intake.
Oh wait, what are we talking about? |
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oprn Samba Member
Joined: November 13, 2016 Posts: 12635 Location: Western Canada
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Posted: Mon Feb 13, 2023 12:45 pm Post subject: Re: Dual port heads on single port case |
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Here is my personal observations. All of the dual port engines that came from VW had dual relief valve cases. All of the single port engines that came from VW had single relief valve cases except for the last year or two of the 1600 SP engines in the type1 and 2s. There may be exceptions to that but the only other one that I am aware of is that some of the single port industrial engines had dual relief cases too. _________________ We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age) |
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