Shimming Valve Springs for Boost?
Shimming Valve Springs for Boost? i got a set of PRC .650 springs from a good friend (on an ms3 cam ls1 for about 1500 miles)
i went on Texas Speeds website to look up the Specs of the springs.
it says installed height of 1.810. Do you guys recommend going a little heavier on the seat because i'm putting some boost behind the valve?
Cam Specs http://shop.brutespeed.com/Comp-54-4...-54-479-11.htm
BTR Lifters
8-10psi of boost
stock rockers trunion upgrade
stock ls1 valves
243 heads
spinning to 7000rpms
any recommendations would be appreciated
Thanks
Anthony
link to the spring information
http://texas-speed.com/p-474-precisi...retainers.aspx
i went on Texas Speeds website to look up the Specs of the springs.
it says installed height of 1.810. Do you guys recommend going a little heavier on the seat because i'm putting some boost behind the valve?
Cam Specs http://shop.brutespeed.com/Comp-54-4...-54-479-11.htm
BTR Lifters
8-10psi of boost
stock rockers trunion upgrade
stock ls1 valves
243 heads
spinning to 7000rpms
any recommendations would be appreciated
Thanks
Anthony
link to the spring information
http://texas-speed.com/p-474-precisi...retainers.aspx
i got a set of PRC .650 springs from a good friend (on an ms3 cam ls1 for about 1500 miles)
i went on Texas Speeds website to look up the Specs of the springs.
it says installed height of 1.810. Do you guys recommend going a little heavier on the seat because i'm putting some boost behind the valve?
Cam Specs http://shop.brutespeed.com/Comp-54-4...-54-479-11.htm
BTR Lifters
8-10psi of boost
stock rockers trunion upgrade
stock ls1 valves
243 heads
spinning to 7000rpms
any recommendations would be appreciated
Thanks
Anthony
link to the spring information
http://texas-speed.com/p-474-precisi...retainers.aspx
i went on Texas Speeds website to look up the Specs of the springs.
it says installed height of 1.810. Do you guys recommend going a little heavier on the seat because i'm putting some boost behind the valve?
Cam Specs http://shop.brutespeed.com/Comp-54-4...-54-479-11.htm
BTR Lifters
8-10psi of boost
stock rockers trunion upgrade
stock ls1 valves
243 heads
spinning to 7000rpms
any recommendations would be appreciated
Thanks
Anthony
link to the spring information
http://texas-speed.com/p-474-precisi...retainers.aspx
Thats alot of duration for a turbo cam IMHO. If you are going through the trouble of turbocharging something why only run 10lbs? Run a small cam, less RPM and more boost. The engine will make more power and live longer.
just would like an answer to my valve spring height question. how do you boost guys usually shim your valve springs?
btw after its a 370 i'm looking to make 800rwhp on 18lbs but again will be with different springs and heads
Thank you, do you guys usually base it off of closed seat pressure or do you try and go around .050 from coil bind? Just looking for alittle education on valvetrain setups. Always thought the least amount of spring preasure as possible to put less stress on the valvetrain, but correct me if i'm wrong
Trending Topics
Seat pressure really doesn't matter...
As long as seat pressure is more than your boost.. you will never open the valve from boost..
And.. once its closed...its even higher forces from inside the cylinder keeping it closed
You need open pressure to be very high to fight lifter "loft"..
So you shim springs up to within .050 or .060 of coil bind to get the maximum pressure possible when open (spring compressed)
As long as seat pressure is more than your boost.. you will never open the valve from boost..
And.. once its closed...its even higher forces from inside the cylinder keeping it closed
You need open pressure to be very high to fight lifter "loft"..
So you shim springs up to within .050 or .060 of coil bind to get the maximum pressure possible when open (spring compressed)
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Seat pressure really doesn't matter...
As long as seat pressure is more than your boost.. you will never open the valve from boost..
And.. once its closed...its even higher forces from inside the cylinder keeping it closed
You need open pressure to be very high to fight lifter "loft"..
So you shim springs up to within .050 or .060 of coil bind to get the maximum pressure possible when open (spring compressed)
As long as seat pressure is more than your boost.. you will never open the valve from boost..
And.. once its closed...its even higher forces from inside the cylinder keeping it closed
You need open pressure to be very high to fight lifter "loft"..
So you shim springs up to within .050 or .060 of coil bind to get the maximum pressure possible when open (spring compressed)
There is a point where you can have too much pressure and lose a little power in the top end...but its usually a pretty small amount and you have to decide if you really need it or not.
