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Booba Samba Member
Joined: July 30, 2016 Posts: 2 Location: Annecy
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Posted: Mon Jun 03, 2019 2:39 am Post subject: oil pump engine 25 hp |
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hello everybody,
need help, have to change my oïl pump for my split Windows 1950 engine 25 HP.
do you know a repro model ? or someone have a NOS for sale ?
my French
thanks |
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Robert Chambers Samba Member
Joined: August 11, 2005 Posts: 216
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Posted: Mon Jun 03, 2019 4:01 am Post subject: Re: oil pump engine 25 hp |
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You should place this as a wanted add in the classified section here on the Samba. Good luck! _________________ '63 OG 117 Herbie Replica
'56 Euro Oval Deluxe
'52 Standard Zwitter
'63 OG 117 |
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Booba Samba Member
Joined: July 30, 2016 Posts: 2 Location: Annecy
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Posted: Tue Jun 04, 2019 8:10 am Post subject: Re: oil pump engine 25 hp |
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but if i can find it in repro ? should be more easy but at the moment only found oïl pump for period 53 until 67
noboby as a solution or information
thanks |
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geneL3c Samba Member
Joined: October 08, 2007 Posts: 296 Location: Bridgehampton,NY
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Posted: Tue Jun 04, 2019 8:55 am Post subject: Re: oil pump engine 25 hp |
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When I rebuilt the 25hp engine in my '50 Standard, I put in a later, new 36hp ( or possibly 40hp ) pump that was slightly thicker for a little extra oil pressure. Only change I had to make was to put in longer 6mm studs. No issues after over ten years. |
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vwoldbug Samba Member
Joined: January 28, 2009 Posts: 1214 Location: Ohio
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Posted: Tue Aug 20, 2019 9:47 am Post subject: Re: oil pump engine 25 hp |
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Try Wolfsberg West |
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sgmalt46 Samba Member
Joined: April 20, 2005 Posts: 1293 Location: south san francisco
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Posted: Tue Aug 20, 2019 1:30 pm Post subject: Re: oil pump engine 25 hp |
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ya what he said Wolfsburg west . I use the 26mm 6mm case stud pumps. stock is 21mm. 25\ 36/ 40hp take the same pump. nothing unique for the 25hp. _________________ 55 deluxe 23 window bus
64 crew cab
55 rag top beetle
66 beetle
71 square back (sold) ! good luck with it Henry!
46 beetle 552nd royal army service corps CCG |
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virtanen Samba Member
Joined: January 08, 2006 Posts: 1461 Location: Finland
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Posted: Wed Aug 21, 2019 2:00 am Post subject: Re: oil pump engine 25 hp |
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The stock gears are 17 mm. If using higher oil pressure than desinged, could be so that the oil relief valve doesn't close to the oil cooler circulation as planned. Then there is a risk for overheating.
_________________ Mika
Split beetle restoration panels
Oval beetle restoration panels
New projects |
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Kjell Roar Samba Member
Joined: December 08, 2008 Posts: 1326 Location: Norway
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Posted: Wed Aug 21, 2019 1:50 pm Post subject: Re: oil pump engine 25 hp |
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virtanen wrote: |
The stock gears are 17 mm. If using higher oil pressure than desinged, could be so that the oil relief valve doesn't close to the oil cooler circulation as planned. Then there is a risk for overheating.
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This is a point many people miss.
A lot of people think old engines need thick oils, but its false. The engine will run hotter, and have less cooling capasity. _________________ I got a historic car, every scratch got a history...
My car, Aug. 4th, 1955 / an early 56: http://www.thesamba.com/vw/forum/album_page.php?pic_id=610438 |
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Martin Southwell Samba Member
Joined: November 24, 2010 Posts: 971 Location: Bath, England
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Posted: Wed Aug 21, 2019 3:49 pm Post subject: Re: oil pump engine 25 hp |
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What evidence is there that a pump that is able to deliver a higher volume of oil, will actually run at a higher pressure? I appreciate that if a greater amount of oil is being forced through the same size oilway, without loss, or pressure relief, ie restricted, then this is possible. Does anybody have any experience of this, and the actual, measurable pressures created?
As somebody points out, the viscosity of the oil will also have an affect, but don't we all use HD30 (High Detergent - SAE30) oil in our old engines? |
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sgmalt46 Samba Member
Joined: April 20, 2005 Posts: 1293 Location: south san francisco
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Posted: Wed Aug 21, 2019 3:56 pm Post subject: Re: oil pump engine 25 hp |
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I'm with Martin a bigger pump increases volume not pressure . that has more to do with oil weight. where are you Joe ? I know he uses 26mm pumps .
Steve _________________ 55 deluxe 23 window bus
64 crew cab
55 rag top beetle
66 beetle
71 square back (sold) ! good luck with it Henry!
46 beetle 552nd royal army service corps CCG |
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virtanen Samba Member
Joined: January 08, 2006 Posts: 1461 Location: Finland
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Posted: Wed Aug 21, 2019 10:21 pm Post subject: Re: oil pump engine 25 hp |
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I have read an test article (I can't remember where) of using different pumps, and there was evidence to disturb the cooling circulation. Why to use longer gear pumps and take the risk when the original 17 mm works? _________________ Mika
Split beetle restoration panels
Oval beetle restoration panels
New projects |
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Ovally Samba Member
Joined: June 14, 2014 Posts: 476 Location: Belgium
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Posted: Wed Aug 21, 2019 10:54 pm Post subject: Re: oil pump engine 25 hp |
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Booba wrote: |
hello everybody,
need help, have to change my oïl pump for my split Windows 1950 engine 25 HP.
do you know a repro model ? or someone have a NOS for sale ?
my French
thanks |
Are you looking for a complete oil pump or just the gears?
Ask Cagero if they have a complete oil pump, they do have the 17 mm gears.
https://www.cagero.com/de/prod/Aircooled/K%C3%A4fe...1&n=27 _________________ VW Bug Oval 1953
VW Bug 1200 D motor
Porsche 911S MFI 1970
Mazda 929 Hardtop 1977
Mercedes SLC 180 Roadster 2018 |
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Kjell Roar Samba Member
Joined: December 08, 2008 Posts: 1326 Location: Norway
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Posted: Thu Aug 22, 2019 7:29 am Post subject: Re: oil pump engine 25 hp |
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Martin Southwell wrote: |
What evidence is there that a pump that is able to deliver a higher volume of oil, will actually run at a higher pressure? I appreciate that if a greater amount of oil is being forced through the same size oilway, without loss, or pressure relief, ie restricted, then this is possible. Does anybody have any experience of this, and the actual, measurable pressures created?
As somebody points out, the viscosity of the oil will also have an affect, but don't we all use HD30 (High Detergent - SAE30) oil in our old engines? |
A pump will roughly deliver flow x pressure. The oil passages and the viscosity restrict the flow. When you using a bigger pump againt a restriction (like the oil system), the oil pressure will rise. If it was no restriction, you would only increase the flow. But an engine got restrictions. So if you use a bigger pump, its vice to use thinner oil, to prevent high oil pressure. At 3 bar/45 psi or higher, the oil cooler is bypassed on newer engines, presume it is same on 25hp.
That said, if I remember right, the 30/36hp engine got 19mm oil pump. Should work fine in a 25hp.
I use 10w40 instead of 30w on my 30/36hp, for better lubrication and better protection when cold, on my 30hp. VW ended up to recommend 15W40 in hot areas. _________________ I got a historic car, every scratch got a history...
My car, Aug. 4th, 1955 / an early 56: http://www.thesamba.com/vw/forum/album_page.php?pic_id=610438 |
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virtanen Samba Member
Joined: January 08, 2006 Posts: 1461 Location: Finland
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