LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Small base circle cam and valve springs?

Thread Tools
 
Search this Thread
 
Old May 3, 2009 | 11:29 AM
  #1  
2QUIK6's Avatar
Thread Starter
Registered User
 
Joined: Nov 2000
Posts: 1,937
From: Ft. Worth, TX
Small base circle cam and valve springs?

For those that have or have used a small base circle cam, what are the recommended valve springs to use?
I'm thinking the smaller base circle will make an already aggressive lobe cam even more aggressive requiring stiffer springs due to the circumference around the lobe being less therefore the ramp speed would be even more although the overall lift is still the same.
I'm just trying to figure out why my valve train is so dam noisey compared to others.
I have an LPE211 cam, and have this exact cam just on a regular base circle grind in my truck and its not noisey.
I already have aluminum rockers and composite LT4 covers, but that didn't help, and just swapped heads as well and that didn't help, so now I'm thinking it has to do with the small base circle cam and the beehive springs.
Already swapped lifters too.
Maybe try some dual springs with more pressure.
Old May 3, 2009 | 11:34 AM
  #2  
rskrause's Avatar
Moderator
 
Joined: Dec 1969
Posts: 10,745
From: Buffalo, New York
No relationship between a small base circle and the spring choice.

Rich
Old May 3, 2009 | 01:09 PM
  #3  
Stl94LT1's Avatar
Registered User
 
Joined: Apr 2006
Posts: 1,083
From: O'Fallon, MO
Are you using guide plates? If so, which ones? Are they aligned properly so there is no pushrod binding? Is the pushrod bottoming out at the top of the slot when the valve is fully open?
Old May 3, 2009 | 03:49 PM
  #4  
2QUIK6's Avatar
Thread Starter
Registered User
 
Joined: Nov 2000
Posts: 1,937
From: Ft. Worth, TX
Originally Posted by Stl94LT1
Are you using guide plates? If so, which ones? Are they aligned properly so there is no pushrod binding? Is the pushrod bottoming out at the top of the slot when the valve is fully open?
Yeah I've been through all of that and had the guide plates machined to give more clearance at the bottom of the groove just in case, then switched to SA rockers, then to aluminum SA rockers, swapped lifters, swapped heads and it simply won't go away...the damn thing is posessed.
It used to have a much higher lift cam in it, but had dual springs then, I still have the duals so I may throw them back on there. Truck had duals and it didn't make a peep, went to the beehives on it, and it is a tad bit louder but nothing like the TA. On the TA I swapped the previous cam for the LPE211 and went from the duals to the beehives at the same time and it hasn't been the same since.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
oldschool
Parts For Sale
16
Feb 9, 2016 09:21 PM
Red_94Formula
LT1 Based Engine Tech
1
Jan 22, 2015 12:17 AM
Jazsun
Cars For Sale
0
Dec 29, 2014 12:14 PM
BIGCOWL-IMP
Midwest
0
Nov 21, 2014 09:40 AM




All times are GMT -5. The time now is 11:17 AM.