LS3 1.85 Rocker Test - Page 2 - LS1TECH - Camaro and Firebird Forum Discussion

Notices
Dynamometer Results & Comparisons Dyno Records | Dyno Discussion | Dyno Wars

LS3 1.85 Rocker Test

Old 09-20-2018, 12:16 AM
  #21  
TECH Senior Member
iTrader: (26)
 
kinglt-1's Avatar
 
Join Date: Jul 2005
Location: Ft. Wayne, IN
Posts: 5,549
Default

Originally Posted by ddnspider View Post
It didn't nose over with stock rockers....so what's the difference if its not rocker weight, simply the increased ratio?
Icreasing rocker ratio increases lift and duration at the valve along with jerk rate intensity...It most likely needs more valve spring pressure.

I ran SLP 1.85 rockers for 9yrs...they are identical to stock rockers other then the push rod cup is relocated to increase the ratio. I will say I am surprised the PSI springs are not keeping things in control with that setup.
kinglt-1 is offline  
Old 09-20-2018, 07:51 AM
  #22  
TECH Senior Member
iTrader: (26)
 
ddnspider's Avatar
 
Join Date: Aug 2004
Location: FL
Posts: 8,015
Default

Originally Posted by 8.Lug View Post
....But what are your cam specs? ....
That reading comprehension though
BASICALLY A MAX EFFORT STOCK HEADS CAM CAR
Originally Posted by kinglt-1 View Post
Icreasing rocker ratio increases lift and duration at the valve along with jerk rate intensity...It most likely needs more valve spring pressure.

I ran SLP 1.85 rockers for 9yrs...they are identical to stock rockers other then the push rod cup is relocated to increase the ratio. I will say I am surprised the PSI springs are not keeping things in control with that setup.
That's why its interesting to me....everyone sings the praises of the PSI1511's, yet it can't handle a stock cam with 1.85 rockers, especially with Ti retainers?
ddnspider is online now  
Old 09-20-2018, 09:34 AM
  #23  
10 Second Club
 
big hammer's Avatar
 
Join Date: May 2009
Location: over dere
Posts: 3,071
Default

Originally Posted by kinglt-1 View Post
Icreasing rocker ratio increases lift and duration at the valve along with jerk rate intensity...It most likely needs more valve spring pressure.

I ran SLP 1.85 rockers for 9yrs...they are identical to stock rockers other then the push rod cup is relocated to increase the ratio. I will say I am surprised the PSI springs are not keeping things in control with that setup.
it only increases duration when measured at .050. Seat to seat it makes no difference.

Also so Iíve read that Stock rockers are actually a rising rate ratio and YTís are a constant ratio. So the valve acceleration near seat would be faster with the rollers than the stockers. Iíd like to see this re done with better valve control and see what happens
big hammer is offline  
Old 09-20-2018, 09:52 AM
  #24  
TECH Senior Member
iTrader: (26)
 
kinglt-1's Avatar
 
Join Date: Jul 2005
Location: Ft. Wayne, IN
Posts: 5,549
Default

Right...duration increases at the valve @ .050

My mistake, I thought OP was using SLP 1.85's. Didn't realize Yella Terra made a 1.85 ratio. Yella Terra are heavier then stock for sure. I would be interested to see what set of SLP 1.85's look like in comparison on the Dyno. On my LS1 w stock cam it made more power and torque through the entire curve over stock 1.7's.

Agree on further testing with better valve control.
kinglt-1 is offline  
Old 09-20-2018, 10:35 AM
  #25  
TECH Senior Member
 
Join Date: Jun 2016
Location: Central Cal.
Posts: 8,718
Default

Yella Terras are aluminum. Are they still heavier than the steel rockers?
G Atsma is online now  
Old 09-20-2018, 11:23 AM
  #26  
TECH Senior Member
iTrader: (26)
 
kinglt-1's Avatar
 
Join Date: Jul 2005
Location: Ft. Wayne, IN
Posts: 5,549
Default

over the tip of the valve they are.
kinglt-1 is offline  
Old 09-20-2018, 12:02 PM
  #27  
10 Second Club
Thread Starter
 
lazerlemonta's Avatar
 
Join Date: Feb 2004
Location: VA
Posts: 335
Default

I dropped almost a pound out of swapping springs and retainers. These are the ultra light version. Really it is a combination of valve control and the stock cam just saying screw you i dont want the air. Needless to say with the mid length runner fast it still increased power from 6600 to 7100 by 25. Not sure what configuration the car will be ran at my rental on 11/6. I have .660 springs coming that are 155lbs on the seat compared to the 130lbs of the 1511s. I could shim the springs but I am not going to waste the time doing so. I just wanted to show my results and help anyone who was considering a high ratio rocker on a stock cam.
lazerlemonta is offline  
Old 09-20-2018, 01:38 PM
  #28  
Launching!
iTrader: (4)
 
Join Date: Oct 2008
Posts: 246
Default

Will you dyno again with the new springs? Should be interesting to see if you gain more up top, or if it really is maxing out the operating range of the stock cam.
spanks13 is online now  


Thread Tools
Search this Thread

About Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: