Search found 203 matches
- Sat Sep 26, 2009 6:28 pm
- Forum: Classic Porsche General Chat
- Topic: Off topic watch chat for the horologists out there
- Replies: 4117
- Views: 290103
- Fri Sep 25, 2009 11:57 pm
- Forum: Porsche 912
- Topic: 12 in a wind tunnel
- Replies: 14
- Views: 801
Ok so I have now read a few books (past the first page) and noted the errors of not correcting the CD for frontal area an also missing out the loss from rolling road power figure to real world power at the wheels. So the below I believe is correct: v max (kph) = 100 * 3√P/(k*CD*A) p = engine power a...
- Sat Sep 19, 2009 9:29 am
- Forum: For Sale - Porsche Parts/Misc etc.
- Topic: For sale - 912 Gear Knob *SOLD*
- Replies: 3
- Views: 230
- Sat Sep 19, 2009 8:45 am
- Forum: Porsche 912
- Topic: 12 in a wind tunnel
- Replies: 14
- Views: 801
Thats very interesting to see your car in the wind tunnel. I’m no auto engineer but I don’t think its quite that simple to calc Vmax ! Vmax depends largely on Aero drag which is proportional to the drag coefficient, frontal area and the square of the vehicle speed. Also add in the rolling resistanc...
- Tue Sep 15, 2009 4:18 pm
- Forum: Porsche 912
- Topic: 12 in a wind tunnel
- Replies: 14
- Views: 801
Interesting reading, and a CD of 0.32 not bad. I remember testing a 1970s Austin Princess once, that wasn't so good. :lol: No 0.320 is quite good, the latest turbo is only 0.295 (although the lift is much better). The main reason for being that low (in relative terms considering its age) is due to ...
- Tue Sep 15, 2009 4:14 pm
- Forum: Porsche 912
- Topic: 12 in a wind tunnel
- Replies: 14
- Views: 801
Great information! The rear lift figure shows why 911s have gained larger and larger rear spoilers over the years! :) 80kg rear on a 1000kg car, with no front lift is pretty significant, no wonder the back of our cars start to wander about once at 'high' motorway speeds. The next questions on the e...
- Tue Sep 15, 2009 11:53 am
- Forum: Classic Porsche General Chat
- Topic: What do you do for a living?
- Replies: 99
- Views: 6061
- Tue Sep 15, 2009 9:43 am
- Forum: Porsche 912
- Topic: 12 in a wind tunnel
- Replies: 14
- Views: 801
Jan I understand your a little dubious, I worked them out more than once to be sure, these are only high level formula so many things are assume to be constant or of no importance, so is indication only. I am also an engineer (did my degree about 10 years ago so forgot it all) and work in automotive...
- Mon Sep 14, 2009 9:38 pm
- Forum: Classic Porsche General Chat
- Topic: Your Porsche pic of the day......
- Replies: 28619
- Views: 2217522
My car on test in the MIRA wind tunnel, more info here if you are interested. http://www.ddk-online.com/phpBB2/viewtopic.php?t=26702
- Mon Sep 14, 2009 9:28 pm
- Forum: Classic Porsche General Chat
- Topic: Pictures please for consideration. The DDK 2010 Calendar
- Replies: 88
- Views: 5163
October is quite a windy month so how about one of the below? http://www.porscheclubgbforum.com/upfiles/775/A858CB24E11D441D944FD36EBDDD4BC8.jpg http://www.porscheclubgbforum.com/upfiles/775/328E1A3F18A945509D37C337EEB5F54D.jpg http://www.porscheclubgbforum.com/upfiles/775/B3BC58462A024B95A13A70ADEC...
- Mon Sep 14, 2009 9:19 pm
- Forum: Porsche 912
- Topic: 12 in a wind tunnel
- Replies: 14
- Views: 801
12 in a wind tunnel
I had a chance to take some high level wind tunnel data on my car (SWB 912) the other day. With the main aim to baseline the car for lift and drag and also to get some undertstanding of small things that could be changed which may effect both. In summary opening holes on the front of the car (fog la...
- Thu Sep 10, 2009 9:27 pm
- Forum: Porsche 912
- Topic: exhaust options
- Replies: 58
- Views: 3784
I think various people stock them, although Andy Prill is always a good bet. To be honnest most people seem to use Neutek now as the Norris is a re-grind cam. From his site: http://www.maxted-pageandprill.com/Products/cams.html Cam Shafts We can supply standard or performance cams from Norris and Ne...
- Wed Sep 09, 2009 9:36 am
- Forum: Porsche 912
- Topic: carpets
- Replies: 4
- Views: 306
- Tue Sep 08, 2009 4:49 pm
- Forum: For Sale - Porsche Parts/Misc etc.
- Topic: 912/356 external oil cooler - SOLD
- Replies: 13
- Views: 461
- Mon Sep 07, 2009 5:45 pm
- Forum: For Sale - Porsche Parts/Misc etc.
- Topic: 912/356 external oil cooler - SOLD
- Replies: 13
- Views: 461