cknox121's slow build

ckrueg · Feb 9, 2015

I would think 65 after subtracting atmospheric would be plenty safe with upgraded springs

sootie · Feb 10, 2015

68 on the mini maxx is fine. just keep it below 70 unless you are using an analog gauge because the factory senor maxxes out at 72

Erikclaw · Feb 10, 2015

Cknox121 said:
So in case I don't like this setup, I'm looking for a 76 atmo just FYI. New or used.

Edit: hope to have the truck back this week!

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I still have the 76 from my High Power set up

Cknox121 · Feb 10, 2015

sootie said:
68 on the mini maxx is fine. just keep it below 70 unless you are using an analog gauge because the factory senor maxxes out at 72

Drake isn't using the mini max. Just didn't want to float a valve

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Erikclaw · Feb 10, 2015

float a valve or have a valve hit the piston. Can you float valves in a diesel like you can in a gasser?

97stoker350 · Feb 10, 2015

It's my understanding that floating a valve is due to too much pressure and valve piston contact can result from valve float OR not enough clearance to begin with. Valve float can be controlled via the gates and boost. However if there's not enough clearance from the get go you will have contact. Contact can even come from rpm but that is a side effect from not having enough spring pressure to return the valve fast enough

Motostroker · Feb 10, 2015

We won't float a valve. I have way to many guages hanging off the wipers and IDS in cab to monitor everything. Summit needs to hurry up with the fittings and we will be roasting some grapplers

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Cknox121 · Feb 10, 2015

Erikclaw said:
float a valve or have a valve hit the piston. Can you float valves in a diesel like you can in a gasser?

Iirc that's what's causes valve/piston contact. See below.

97stoker350 said:
It's my understanding that floating a valve is due to too much pressure and valve piston contact can result from valve float OR not enough clearance to begin with. Valve float can be controlled via the gates and boost. However if there's not enough clearance from the get go you will have contact. Contact can even come from rpm but that is a side effect from not having enough spring pressure to return the valve fast enough

That's the plan! Thanks

Motostroker said:
We won't float a valve. I have way to many guages hanging off the wipers and IDS in cab to monitor everything. Summit needs to hurry up with the fittings and we will be roasting some grapplers

Lol I bet people are like wtf when they see it. Maybe that's way all videos are at night lol.

FWIW - the shop that did my motor work installed Pistons and then decked them flat with the heads, or something like that, to prevent piston/valve contact. I was going to have them cut but I didn't think I was going this high of a hp build. Oh well.

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sootie · Feb 10, 2015

Cknox121 said:
Drake isn't using the mini max. Just didn't want to float a valve

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10-4, i though i saw somewhere that it was H&S tuning, my bad

Erikclaw said:
float a valve or have a valve hit the piston. Can you float valves in a diesel like you can in a gasser?

you can float the exhaust valves by having way to much ebp which pushes the valve open and doesnt let it seat even if there is no force from the pushrod (hydraulic lifters dont help)

97stoker350 said:
It's my understanding that floating a valve is due to too much pressure and valve piston contact can result from valve float OR not enough clearance to begin with. Valve float can be controlled via the gates and boost. However if there's not enough clearance from the get go you will have contact. Contact can even come from rpm but that is a side effect from not having enough spring pressure to return the valve fast enough

excessive rpms can cause intake valves to have piston contact because they dont have a chance to seat properly before the next revolution comes around