 RPM's for stock Pushrods?, How high before you need to upgrade |
|
|
|
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. |
|
|
| justme |
 Jan 31 2009, 10:02 AM
Post
#1
|
|
Member  Group: Members Posts: 187 Joined: 1-January 07 From: southampton ma atlantic northeast Member No.: 7,413 Region Association: North East States  |
So.....
How high can you go for regular use with stock pushrods? The 1911 I'm putting together should see 5500-6000 rpmon a somewhat regular basis. Is this ok or do I need chromoly rods? What are the advantages of going with steel? Thanks, Phil |
   |
 
|
  |
Replies
| Jake Raby |
Jan 31 2009, 08:32 PM
Post
#2
|
|
Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
What dictates the omission of stock pushrods is the fact that they can't be utilized to alter valve train geometry when one of the 11+ variables that dictate the geometry are altered..
I have used stock pushrods in engines that turned 7,000 RPM back when I was too dumb to realize the risks.. Yes I had failures, but there isn't much I haven't broken over the years. You should view my camshaft and valve train presentation, then you'lkl understand component compatability better and why the stock pushrods create compromise. The general rule with valve train is "Overkill Engineering" is the best policy, when valve train parts fail its really nasty and with no apparent symptoms prior to a boom that could make your engine look like Hiroshima inside. |
 |
|
Posts in this topic
justme RPM's for stock Pushrods? Jan 31 2009, 10:02 AM
Al Meredith My experience is that stock springs will only hold... Jan 31 2009, 06:33 PM
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 1st June 2024 - 10:07 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.