![]() |
|
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. |
|
![]() |
T H O M A S |
![]()
Post
#1
|
Senior Member ![]() ![]() ![]() Group: Members Posts: 626 Joined: 1-August 03 From: Donaueschingen, Germany Member No.: 974 Region Association: None ![]() |
inspired by a recent threat here about lightning gears and there benefits ,i decided to give it a shoot and wire edm 1st and 2nd gear .the weight difference form stock to modified is
3rd gear .3764kg ( the lightest gear to slow down for shifting) 2nd gear was .5078kg is now .4398kg 1st gear was .6754kg is now .5468kg gears have bin cryo treated after the machining for testing the transmission will be mated to a 200hp /4 engine i let everybody know if the gears survive and if it makes a difference in shifting Attached image(s) ![]() |
![]() ![]() |
aircooledtechguy |
![]()
Post
#2
|
The Aircooledtech Guy ![]() ![]() ![]() Group: Members Posts: 1,966 Joined: 8-November 08 From: Anacortes, WA Member No.: 9,730 Region Association: Pacific Northwest ![]() |
I'm interested to see how this works out and if there are noticeable differences in how the car drives and shifts. I don't currently have any use for this type of modification, but it sure is interesting none the less.
Having spent 2 decades as an NDT for military aircraft, I've seen my fair share of cracked parts and the modifications needed to stop them. I can surely appreciate the concerns brought up by ME733 as to the addition of lots of stress risers. It looks as though the ID of the cuts were well radiused to the eye but is doesn't appear as though the top and bottom where the cuts transition to the face of the gear have any radius; it looks like a bit of a knife edge transition. Having a radius on all transitions will help it be less crack-prone during use. Also shot peening prior to final heat treating (or cryo in this instance) will relieve stresses that EDMing and other machining induce into the gears. A a rule, cracks almost always originate in a corner or on a knife edge be it in the shape of the part or from a stray machining mark |
![]() ![]() |
![]() |
Lo-Fi Version | Time is now: 15th June 2024 - 09:30 PM |
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 ... |