I am doing the oil pump upgrade thing. I have read all the threads I can find. Standard 2.0L in now and no racing envisaged after the engine rebuild. Are the 3.0L pumps suitable or should I really be looking for the 3.2L with the modified pan?
I am doing the oil pump upgrade thing. I have read all the threads I can find. Standard 2.0L in now and no racing envisaged after the engine rebuild. Are the 3.0L pumps suitable or should I really be looking for the 3.2L with the modified pan?
Merv
Member # 2633
Cars:
Porsche '68 - 911N (Sold)
Porsche 356B (T-6) S Coupe
Porsche 2008 C2 997 Cabriolet (Sold)
Porsche 2010 Gen.2 Boxster S
I personally went with the 3.2 because there have been some horror stories of the separate venturi screens coming apart and debris being sucked into the pump.
I don't have the link handy but a search on the bird should find the threads showing the damage.
andy
67S in pieces
EarlyS: 1358
[SIGPIC][/SIGPIC]
Thanks Andy. I am not seeing those horror stories, but maybe looking in the wrong places.
My 1968 2.0L is a rebuild to pretty much stock spec and I have been advised to consider an oil pump upgrade. I can get a decent 3.0L one, and also at a much higher cost, a 3.2L. The latter one seems to require a non-stock sump plate to fit its strainer.
My question related to the capacity/suitability of the 3.0L (SC - 4-Rib) as compared to the Carrera 3.2L - in early motors such as mine.
I also think that either one would still need a few parts replaced, such as the screen?
Last edited by Merv; 04-24-2015 at 01:44 PM. Reason: more info
Merv
Member # 2633
Cars:
Porsche '68 - 911N (Sold)
Porsche 356B (T-6) S Coupe
Porsche 2008 C2 997 Cabriolet (Sold)
Porsche 2010 Gen.2 Boxster S
My opinion is on a stock build such as yours, and no track use intended, I use the original aluminum pump if it has a good housing and gears. It's only worked for 45 years, must not be much wrong with the design.
Early S Registry member #90
R Gruppe member #138
Fort Worth Tx.
Thanks Ed. Yes - I am in fact starting to lean that way as I am not keen to add a different sump plate to accommodate the larger 3.2 with strainer. Oil pressure was good before the rebuild. If the earlier 3.0 litre pump could be fitted directly, without sump plate, then that would seem the only alternative. My car is an early 68 with an Mag engine case - therefore I 'suspect' the pump body is also magnesium?
Last edited by Merv; 04-24-2015 at 03:57 PM.
Merv
Member # 2633
Cars:
Porsche '68 - 911N (Sold)
Porsche 356B (T-6) S Coupe
Porsche 2008 C2 997 Cabriolet (Sold)
Porsche 2010 Gen.2 Boxster S
SC & 3.2 pumps have the same gear lengths and ratio. Are you doing oil bypass mod? I believe the ratio between the pressure and scavenge sides was changed with the case casting change.
Getting a domed sump plate is not difficult.
andy
67S in pieces
EarlyS: 1358
[SIGPIC][/SIGPIC]
Yes Andy the bypass mod has now been done on the case. I have a line on a couple of pumps here in Australia but as yet no photos to confirm type or condition.
Merv
Member # 2633
Cars:
Porsche '68 - 911N (Sold)
Porsche 356B (T-6) S Coupe
Porsche 2008 C2 997 Cabriolet (Sold)
Porsche 2010 Gen.2 Boxster S
another trick is to blueprint the oil pump
Ed - whether I do retain the existing pump or not (after check up), it would seem that the pressure relief valve should be replaced with the solid one in the drawing below. The springs would seem not as essential to replace.
I am not totally sure which part number for the valve for the 2.0L case.
Would seem to be this one http://www.sierramadrecollection.com...11-p20563.html ?
Should the safety valve also be replaced? It looks to be the same part number.
Last edited by Merv; 04-24-2015 at 08:19 PM.
Merv
Member # 2633
Cars:
Porsche '68 - 911N (Sold)
Porsche 356B (T-6) S Coupe
Porsche 2008 C2 997 Cabriolet (Sold)
Porsche 2010 Gen.2 Boxster S
Pelican sells a kit with the appropriate piston & correct length springs. I used the original caps rather than the hex caps for aesthetics but I had to make up some shims because the internal depth of the spring seat was different on the modern caps.
andy
67S in pieces
EarlyS: 1358
[SIGPIC][/SIGPIC]