Valvetrain weight concerns with Caddy lifters
Thread Starter
Joined: Jan 2002
Posts: 4,072
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From: Casselberry FL
Valvetrain weight concerns with Caddy lifters Not sure if this belongs in Advanced or regular, but I'll start here and someone can relocate it if it's inappropriate 
I've read a little somewhere about the Caddy racing lifters supporting a much lighter valvetrain in the endurance motors. Will the increased valvetrain mass cause longevity problems in a street/autox/road race vehicle unless I use hollow unobtainium valvetrain components instead of typical valves, dual springs, pushrods, etc?
Also, do we have specs on how much open/close spring pressure as well as lobe lift these Caddy lifters will control?
I've read a little somewhere about the Caddy racing lifters supporting a much lighter valvetrain in the endurance motors. Will the increased valvetrain mass cause longevity problems in a street/autox/road race vehicle unless I use hollow unobtainium valvetrain components instead of typical valves, dual springs, pushrods, etc?
Also, do we have specs on how much open/close spring pressure as well as lobe lift these Caddy lifters will control?
Last edited by JimMueller; Jun 16, 2007 at 01:04 PM.
Launching!
Joined: Jan 2003
Posts: 228
Likes: 0
From: Saginaw, MI
The tech department is a little out of my realm but. The spring adds the load on the lifter, that's the resistence. So what is the spring pressure on the caddy lifter - ls6 spring ie: light. The reason for a light valvetrain is so the ls6 spring can handle higher rpms and last 100k+. A heavy valvetrain isn't the worst thing you just need enough spring to control it at a given rpm. vavlefloat...... (also spring maybe lifter life)
Launching!
Joined: Jun 2007
Posts: 212
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From: NC
Where you want to try to save the most weight in a valvetrain is on the spring side of the rocker fulcrum. Lifter weight and pushrod weight has a little effect on your valvetrain dynamics. The biggest reason why you see light pushroads in some racing is that they are trying to achieve a "spring board" effect from them and actually storing energy in the pushrod.
Lighter is still better on that side, but for the sake of durablity sometimes not worth it.
Lighter is still better on that side, but for the sake of durablity sometimes not worth it.
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Originally Posted by MSURacing
The lightweight lifter is not the assembly itself. The magic is inside. If you need more info, contact me.
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Verdad Gallardo Thread Starter
Joined: Jan 2002
Posts: 4,072
Likes: 76
From: Casselberry FL
Originally Posted by MSURacing
The lightweight lifter is not the assembly itself. The magic is inside. If you need more info, contact me.
How about the pushrod wall thickness and diameter? Will 3/8 x .08 be sufficient for a 145/390 dual spring? Should I use the recommended preload of .060 for the Caddy lifters? I read reducing the preload will help...
https://ls1tech.com/forums/advanced-engineering-tech/413469-weight-over-lifter-verses-weight-over-valve.html
