ER rocker info - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 05-02-2007, 10:24 PM   #1
Senior Member
True Car Nut
Thread Starter
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default ER rocker info

For those interested in the best n/a L36 rocker ratio, check out this thread. Wizbang is the one who did all the testing and development for the now ZZP rockers.
95naSTA is offline   Reply With Quote
Old 05-02-2007, 11:06 PM   #2
Senior Member
Certified GM nut
 
Join Date: Dec 2002
Location: plattsburgh NY
Posts: 2,037
Thanks: 0
Thanked 0 Times in 0 Posts
TJ'sblackbonne is on a distinguished road
Default

I was going to post this and i saw you did, thanx mike
TJ'sblackbonne is offline   Reply With Quote
Old 05-02-2007, 11:09 PM   #3
Senior Member
Posts like a Turbo
 
mike1053's Avatar
 
Join Date: Apr 2007
Location: republic, mo
Posts: 379
Thanks: 0
Thanked 0 Times in 0 Posts
mike1053 is on a distinguished road
Default

Quote:
Originally Posted by TJ'sblackbonne
I was going to post this and i saw you did, thanx mike
I wondered and now I am going for a Freak of nature if you will on other thread...
mike1053 is offline   Reply With Quote
Old 05-03-2007, 01:02 AM   #4
Senior Member
Posts like a Corvette
 
Join Date: Jan 2007
Location: San Diego, CA
Posts: 1,451
Thanks: 0
Thanked 0 Times in 0 Posts
agrazela is on a distinguished road
Default

Awesome post, thanks. I especially like these tidbits:

Quote:
Replace the stock valve springs ONLY on the Intake Valves. Leave the stock springs on the Exhaust Valves. The Exhaust Valves with stock springs and ER Rockers have been tested to near 7,000 RPM and do not float. Installing heavier springs is only adding to parasitic HP loss and additional valvetrain stress and wear.

High mileage (stock or otherwise) valve springs are not bad by any rationale or by virtue of their age or length of service. In fact, they actually have a higher reliability due to their age and use. This is because springs undergo a type of stress relieving called aging and elevating temperatures increases the rate at which the steel ages. As the springs undergo this stress relieving, they will loose some spring rate or tension. The rate at which they loose their tension decreases asymptotically with time. This means they undergo much of their stress relieving early in their service life and much less later on. If a valve spring is manufactured properly, they will not undergo fatigue failure. I would have higher confidence in springs that have been in service for 100K miles than new springs. The older springs have proven not have any defects in the metal that will lead to a premature failure. These older springs have withstood the test of time. Regardless of the decrease in spring rate, the springs will far out-last the engine in all respects.
Since I was considering the possibility of leaving the stock springs on the exhaust with my SR rockers, and swapping in stronger on the 1.85 intakes only...now I know that'* recommended

In fact, I plan to test whether the 1.8'* are even needed on the exhaust, or the stock 1.6 is adequate.
agrazela is offline   Reply With Quote
Old 05-03-2007, 02:21 AM   #5
Senior Member
Posts like a Turbo
 
Join Date: Apr 2007
Location: Santa Rosa, CA
Posts: 360
Thanks: 0
Thanked 0 Times in 0 Posts
hawkjet is on a distinguished road
Default

For those looking at ZZP ER Rockers, be sure to look at this:

http://www.easyperformance.com/Tech_...t_Content.html

It gives real data and dyno test results.
hawkjet is offline   Reply With Quote
Old 05-03-2007, 09:27 AM   #6
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Quote:
Originally Posted by mike1053
Quote:
Originally Posted by TJ'sblackbonne
I was going to post this and i saw you did, thanx mike
I wondered and now I am going for a Freak of nature if you will on other thread...
Not sure what you're talking about, Mike, but these rockers won't work for your car. You have a different engine.
willwren is offline   Reply With Quote
Old 05-03-2007, 12:39 PM   #7
Senior Member
Posts like a Corvette
 
Join Date: Jan 2007
Location: San Diego, CA
Posts: 1,451
Thanks: 0
Thanked 0 Times in 0 Posts
agrazela is on a distinguished road
Default Re: ER rocker info

Quote:
Originally Posted by 95naSTA
For those interested in the best n/a L36 rocker ratio, check out this thread. Wizbang is the one who did all the testing and development for the now ZZP rockers.
In thinking about wizbang'* post a bit more...

Do you have any info on how he tested that stock springs can handle 1.8+ ratios and up to 7k rpm'*? This is definitely the first time I've ever heard anyone assert that this was a safe practice...
agrazela is offline   Reply With Quote
Old 05-03-2007, 01:50 PM   #8
Senior Member
True Car Nut
Thread Starter
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

Other than that easy performance article and that new thread, I don't really have any other info.
I know he has dynoed his car probably more than any other gpgt owner though..
95naSTA is offline   Reply With Quote
Old 05-03-2007, 04:56 PM   #9
Senior Member
True Car Nut
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Thanks: 0
Thanked 1 Time in 1 Post
big_news_1 is on a distinguished road
Default

That is an excellent thread.... thank you very much for posting. I'll have to make sure Doug sees this one as well...
big_news_1 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Rocker Arm Bolts Ryan2Dope 1992-1999 10 04-02-2004 09:50 PM
Infinity or Rocker Fosgate Burgundy_Boat Audio (and aftermarket electronics) 11 03-27-2004 02:34 AM
sse/ssei rocker molding retaining screws aukc 1992-1999 6 10-04-2003 07:59 PM
Chrome rocker panel mouldings? Luke Greffen 1992-1999 8 04-03-2003 12:55 AM
info on driver info center and compass wiring bonnieboy23 General GM Chat 3 02-28-2003 02:08 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:30 AM.


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.