Dilemma with camshafts

[jonbill]

this is how cam regrinding works.

[shnazzle]

How can the gaps be so big??
Does the camshaft need to be ground? I mean, it's off by miles. What diameter are the journals compared to stock?

I guess that these are reground stock cams, they get the greater lift by basically reducing the size of the cam heel. Therefore the gap has to be adjusted to compensate and the lift is increased. Quite cleaver really but also annoying. 

That's really rather poor. No offense m1tch

But if I wanted higher lift cams I'd want the lobes higher and with longer duration, not the actual cam ground down! That's cheating

Not m1tch's fault, we were both duped!, I suppose it keeps the costs down.

I didn't mean it was Mitch's fault. I meant I didn't want to insult the Piper cams  


Are Crowers reground or cast?

[Call the midlife!]

My Crowers are ground from new cores but there's two different Crowers to consider.

[m1tch]

I am still awaiting a response back from Pipercams, apparently they have now relayed it to the development director, I sent all my measurements over and simply asked how I am meant to clearance the cams with the stock setup.

As mentioned already, it looks like Piper have reground used cams vs using new cores like Crower meaning that the base circle diameter has been reduced meaning that its basically impossible to clearance them with shimless buckets.

Options are either:

Use the Supertech buckets with shims
Use 5.5mm lash caps and grind down OEM buckets

To be able to run lash caps you actually need to remove material from the OEM buckets to then allow for the lash caps, think the smallest is 1mm so around 0.5mm needs to be removed from the 'post' inside the bucket - ironically you need a smaller bucket to then increase the overall shim and bucket stack.

Will update this thread once Pipercams get back to me - they are currently very short staffed.

[Mikeymead]

Would shim under bucket 3SGTE followers fit?

[jonbill]

Would shim under bucket 3SGTE followers fit?

yes, I believe they do. I saw it on telly. maybe it was project binky?

[m1tch]

Would shim under bucket 3SGTE followers fit?

The 3SGTE and the 2JZ engines use the 1zz shimless buckets as upgrades so yes you can run either of those buckets and followers in the 1zz, however they are a downgrade from the shimless buckets as the shims can pop out at higher RPMs which is why people usually upgrade to 1zz shimless.

[Mikeymead]

Would shim under bucket 3SGTE followers fit?

The 3SGTE and the 2JZ engines use the 1zz shimless buckets as upgrades so yes you can run either of those buckets and followers in the 1zz, however they are a downgrade from the shimless buckets as the shims can pop out at higher RPMs which is why people usually upgrade to 1zz shimless.

Is that so likely with shim under bucket types, I can definitely see it on shim over bucket ones.

[moca2cv]

Hi m1tch,
How did you get on with the cams in the end? Looking at getting a regrind for an N/A 1ZZ from Newman who are just around the corner from me (much cheaper than Crowe/Cat etc) and wondering what I should do about the buckets... did Piper ever get back to you?
TIA!