It depends on the material.volodkovich wrote: ↑Tue Aug 18, 2020 5:02 pm If through-hardened to ~55-60Rc, would the core be too brittle on a cam machined from ductile cast iron?
S7 in the low to mid 50's is a great material for making punches.
Machining cam blanks from Dura-Bar cast iron bar stock ?
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SchmidtMotorWorks
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Re: Machining cam blanks from Dura-Bar cast iron bar stock ?
S7 in the low to mid 50's is a great material for making punches.
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williamsmotowerx
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Re: Machining cam blanks from Dura-Bar cast iron bar stock ?
What are your valve weights and spring pressures?
Assuming these are lighter pressures than race car stuff, there's some leeway on cam hardness.
I'd also get lifter face hardness tested. That will give you an idea where you need to be on cam hardness
Assuming these are lighter pressures than race car stuff, there's some leeway on cam hardness.
I'd also get lifter face hardness tested. That will give you an idea where you need to be on cam hardness
Re: Machining cam blanks from Dura-Bar cast iron bar stock ?
For conventional cast camshafts around 50 HRC is good, harder may run into becoming too brittle.
If it's ductile iron, going harder might be OK. I don't know but... educated guess.
If it's ductile iron, going harder might be OK. I don't know but... educated guess.