Valvespring Issues. Need Advise
Thread Starter
Joined: Aug 2007
Posts: 1,368
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From: Oshawa, Ontario
Valvespring Issues. Need Advise Engine is in my sig below. I have a set of pac 1518 springs with around 6k on them and when the builder set them up they were at 1.800 and we just found out the seat pressure is 131lb. Lloyd rec 145-150lb and now were in the process of adding a shim to make up to 1.750 which will give me the 145lb seat pressure. My question after 6k and this mild cam should I be worried they night be as strong and hitting the 145?
The reason I'm doing this and correcting is because right at 6100 is runs out of steam and is an airflow issue. We checked to make sure the valves are sealing which they do so leads us to the springs and the fact they were not setup at the right seat pressure which is a problem. Should these springs take a lot more abuse and be fine?
Thanks!
The reason I'm doing this and correcting is because right at 6100 is runs out of steam and is an airflow issue. We checked to make sure the valves are sealing which they do so leads us to the springs and the fact they were not setup at the right seat pressure which is a problem. Should these springs take a lot more abuse and be fine?
Thanks!
Last edited by 95mysticta; Jun 29, 2012 at 07:53 AM.
TECH Veteran
Joined: Apr 2008
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6k miles should not have "worn" the springs so setting them with a shim to increase seat pressure should be fine. don't know your lift but just confirm you don't go into coil bind with the springs set up tighter
you can check spring pressure at that height when you pull one of the springs and test it in a spring compresser measuring tool to see what you actually get.
the 918's have more pressure if you need to step up
you can check spring pressure at that height when you pull one of the springs and test it in a spring compresser measuring tool to see what you actually get.
the 918's have more pressure if you need to step up
