Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

> How to cut steel pushrods, Valve Train Set-Up
Highland
post Jan 23 2014, 09:25 AM
Post #1


Senior Member
***

Group: Members
Posts: 513
Joined: 8-August 11
From: San Diego, CA
Member No.: 13,418
Region Association: Southern California



How to most people get their pushrods cut? Should I take the pushrods to the same machinest that worked on my engine parts (crank, cylinders, rods,...) or to a regular machine shop?

Also, what tolerance should I give them? +/-0.001"?

Below are my numbers for a Raby 9590 cam with 0.426" lift for exhaust and intake. Are these numbers typical?

Cylinder.....Intake Lift....Intake Rod Length
1...............0.432................10.567"
2...............0.433................10.607
3...............0.431................10.640 (required 0.03 shim)
4...............0.424................10.578


Cylinder.....Exhaust Lift....Exhaust Rod Length
1...............0.410...............10.623"
2...............0.409...............10.618
3...............0.412...............10.663 (required 0.03 shim)
4...............0.410...............10.612
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
Reply to this topicStart new topic
Replies
stugray
post Jan 23 2014, 10:09 AM
Post #2


Advanced Member
****

Group: Members
Posts: 3,825
Joined: 17-September 09
From: Longmont, CO
Member No.: 10,819
Region Association: None



I believe I cut mine with a hacksaw ~1/16" long and then ground them down with a bench belt sander.
I was able to get them very accurate.

I was also able to find a length that worked fine for all valves.
I did not have to make custom lengths for each valve.

The number I used is written down at home but was very close to what Jake reccommends starting with.
I also shimmed my rockers up by a small amount (.049 if I recall correctly I have to look). But I have pretty big valve lift (.505 & .475 ish)
We sanded the shims to match exactly between the 8 locations.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Posts in this topic


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 9th June 2024 - 09:30 PM