Generation III Internal Engine 1997-2006 LS1 | LS6
Sponsored by:
Sponsored by:

Pushrod length for cam change

Thread Tools
 
Search this Thread
 
Old 01-06-2008, 01:18 PM
  #1  
TECH Regular
Thread Starter
iTrader: (10)
 
ybaslo1's Avatar
 
Join Date: Nov 2003
Location: Joliet, IL / Virginia Beach, VA
Posts: 420
Likes: 0
Received 0 Likes on 0 Posts

Default Pushrod length for cam change

I started thinking about this after a discussion with another person. The 7.400" pushrod is the correct length is in a factor motor with a stock camshaft, right? Well, if you change the cam, couldn't you just measure the base circle of the original camshaft and the replacement, take the difference, then just add that to 7.400 to get the correct length pushrod?

I'm just asking because alot of people seem to not want to buy the push rod tool and/or afraid to use it. I'm just curious.
Old 01-06-2008, 01:42 PM
  #2  
JPH
TECH Junkie
iTrader: (2)
 
JPH's Avatar
 
Join Date: Jan 2006
Location: Fort Wayne, IN
Posts: 3,776
Likes: 0
Received 0 Likes on 0 Posts

Default

whats the cam profile your going to use?
Old 01-06-2008, 02:34 PM
  #3  
TECH Senior Member
iTrader: (4)
 
vettenuts's Avatar
 
Join Date: Jul 2004
Location: Little Rhody
Posts: 8,092
Likes: 0
Received 9 Likes on 9 Posts

Default

Except stock pushrods aren't 7.400".
Old 01-06-2008, 03:45 PM
  #4  
TECH Regular
Thread Starter
iTrader: (10)
 
ybaslo1's Avatar
 
Join Date: Nov 2003
Location: Joliet, IL / Virginia Beach, VA
Posts: 420
Likes: 0
Received 0 Likes on 0 Posts

Default

Originally Posted by JPH
whats the cam profile your going to use?

I'm not, my cam is stock and staying that way for a while. I'm just asking so we can discuss this and see if this is a possible solution to someone having to buy the pushrod tool.

I'm an Engineer so I think alot.
Old 01-06-2008, 03:48 PM
  #5  
TECH Regular
Thread Starter
iTrader: (10)
 
ybaslo1's Avatar
 
Join Date: Nov 2003
Location: Joliet, IL / Virginia Beach, VA
Posts: 420
Likes: 0
Received 0 Likes on 0 Posts

Default

Originally Posted by vettenuts
Except stock pushrods aren't 7.400".
True, aren't they 7.375 or something like that. Thank you for correcting me, I was mainly just concerned about the theory though.
Old 01-06-2008, 04:35 PM
  #6  
TECH Resident
 
Weezzer's Avatar
 
Join Date: Jan 2003
Location: South Alabama
Posts: 937
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by ybaslo1
Well, if you change the cam, couldn't you just measure the base circle of the original camshaft and the replacement, take the difference, then just add that to 7.400 to get the correct length pushrod?
You would take the difference, then divide by two (your pushrod is operating off the cam RADIUS)
and add it to the pushrod length.
If the base circle was .050" in diameter smaller, you'd add 0.025" to the pr. with all other parameters being equal.

How long have you been an Engineer did you say?




All times are GMT -5. The time now is 04:24 AM.