- Joined
- Feb 5, 2022
- Messages
- 60
I measured my valve spring pressures at ~80lb (lowest 78, highest 84), at the spring lengths specified in the manual (1.259" and 1.284" outer spring length for intake and exhaust, respectively. the inner lengths at whatever the stepped washers put them at). This should be the seated (closed) pressure, if I understand the threads on measuring spring pressure correctly.
The closest thing to a spec for what the pressures should be is 80 to 100lb, from https://www.accessnorton.com/NortonCommando/valve-spring-seating-pressure.10667/
The question: should I get new springs, or shim the old ones, or leave them as is?
As far as I know they are the original springs, and I'm running a JS0 cam (stock profile) with them.
The closest thing to a spec for what the pressures should be is 80 to 100lb, from https://www.accessnorton.com/NortonCommando/valve-spring-seating-pressure.10667/
The question: should I get new springs, or shim the old ones, or leave them as is?
As far as I know they are the original springs, and I'm running a JS0 cam (stock profile) with them.