My motor issues are figured out!
Thread Starter
9 Second Club
iTrader: (24)
Joined: Oct 2006
Posts: 2,796
Likes: 1
From: Kennesaw, Georgia
My motor issues are figured out! During testing 3 weeks ago and at the shootout, @15psi. the motor would not want to to rev, like it did @7psi. and when I turned the boost up to 20psi. the car would lose appx. 15mph. Well today I took a valve spring off the motor and over to my engine builder and come to find out the spring seat pressure is only 120lbs. and the open pressure is only 350lbs. @.650lift.
Needeless to say the valves were definatly floating. My engine builder hooked me up some some new springs they had in stock. Now my seat pressure will be 200lbs. and open pressure will be 670lbs@ .650lift! These will be on the borderline for the hydralic roller lifters. Once again, the setup should make some more power!
Needeless to say the valves were definatly floating. My engine builder hooked me up some some new springs they had in stock. Now my seat pressure will be 200lbs. and open pressure will be 670lbs@ .650lift! These will be on the borderline for the hydralic roller lifters. Once again, the setup should make some more power!
So what springs did you have before and what kind did he set you up with, im going to be running close to the same boost and id perfer to get the right ones before the motor is done.
Thread Starter
9 Second Club
iTrader: (24)
Joined: Oct 2006
Posts: 2,796
Likes: 1
From: Kennesaw, Georgia
I had used the double springs that came with the heads from ETP. Craig had told me not to use them, but I wanted to atleast give them a try. Needless to say he was correct. My new springs may be different from from what you would get, due to the actual diameter of the spring. My heads have been machined to hold larger diameter springs.
Thread Starter
9 Second Club
iTrader: (24)
Joined: Oct 2006
Posts: 2,796
Likes: 1
From: Kennesaw, Georgia
You are correct. Once we installed the springs , at installed heght the pressures went way up. So we got another set of springs from Comp Cams and now my pressures at installed height are 180seat and 550 open. What a difference the springs made. No problem hitting the rev limiter now. Going back to the track this weekend for more tuning.
You are correct. Once we installed the springs , at installed heght the pressures went way up. So we got another set of springs from Comp Cams and now my pressures at installed height are 180seat and 550 open. What a difference the springs made. No problem hitting the rev limiter now. Going back to the track this weekend for more tuning.
Trending Topics
Thread Starter
9 Second Club
iTrader: (24)
Joined: Oct 2006
Posts: 2,796
Likes: 1
From: Kennesaw, Georgia
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
