Heater Flappers for 914-6 |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Heater Flappers for 914-6 |
Biggles |
May 31 2017, 02:03 PM
Post
#1
|
Member Group: Members Posts: 191 Joined: 5-September 13 From: UK Member No.: 16,353 Region Association: England |
|
gereed75 |
Jun 27 2017, 06:55 AM
Post
#2
|
Senior Member Group: Members Posts: 1,260 Joined: 19-March 13 From: Pittsburgh PA Member No.: 15,674 Region Association: North East States |
Ok guys, we were wrong on this one.
Was mounting my 4 flapper valves and decided to add the six holes. Put in some holes and then decided to get my six flappers out to see how big the holes are supposed to be. While looking into the hole on the four flappers I noticed cutouts in the internal tube under the "mushroom" cap (they look like the cutouts on top of a castle tower). Then I looked at the six ones to compare. The castellated cutouts on the four version are twice the size as on the six version. So it looks like the four version passes just as much air through these larger vents as the six version does through the smaller vents and the hole. Maybe the engineers did this as a slight cost savings. While cutting the vents in the tube, might as well make them bigger and skip the extra step of adding the hole? So now I have double venting flappers. Makes me wonder if I am robbing some air that would otherwise flow through the shroud to the cylinder fins? Oh the horror! |
Biggles |
Jun 27 2017, 03:15 PM
Post
#3
|
Member Group: Members Posts: 191 Joined: 5-September 13 From: UK Member No.: 16,353 Region Association: England |
cheers for posting - useful to know. I was going to adapt the ones I've bought, but seems like no need
Ok guys, we were wrong on this one. Was mounting my 4 flapper valves and decided to add the six holes. Put in some holes and then decided to get my six flappers out to see how big the holes are supposed to be. While looking into the hole on the four flappers I noticed cutouts in the internal tube under the "mushroom" cap (they look like the cutouts on top of a castle tower). Then I looked at the six ones to compare. The castellated cutouts on the four version are twice the size as on the six version. So it looks like the four version passes just as much air through these larger vents as the six version does through the smaller vents and the hole. Maybe the engineers did this as a slight cost savings. While cutting the vents in the tube, might as well make them bigger and skip the extra step of adding the hole? So now I have double venting flappers. Makes me wonder if I am robbing some air that would otherwise flow through the shroud to the cylinder fins? Oh the horror! |
Lo-Fi Version | Time is now: 10th June 2024 - 03:43 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |