Safe Valve relief depth

[motorwood]

Whats the closest the relief can be to the iron top ring insert?

How bout pistons without iron, how close to the ring groove?

 

[DISTURBED]

How deep do you need? We run .250 all the time on 12v with no issue

 

[motorwood]

Thanks Jeremy. Its a different application. .250 might put me into the iron. At .250 how close is a cummins to the iron?

 

[DISTURBED]

I will have to measure one tomorrow. I can't remember

 

[motorwood]

Did you get a chance to measure yet?

 

[DISTURBED]

I Will measure on right now

 

[DISTURBED]

.320 from the top ring. These are 286110 pistons

 

[motorwood]

Thanks

 

[kansasfirstgen]

I have done .270 on a 286110 piston

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[murphy41]

Damn those are big reliefs.

 

[kansasfirstgen]

Enough for .030 ptv clearance

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[cjreckart]

I take .030 off the top then cut the 286110 .250 for reliefs and that was with 90+ lbs of boost and 1550+ hp

 

[cumminsforlife]

I have mahl big bowls being cut a lil over .200 and he's saying I only have .100 left. I think he might have measured wrong or something next year I'm getting forged pistons so I won't have to worrie about it but it's on my mind at the moment. Will it blow through if it gets a lot of heat on them?

 

[murphy41]

Are you coating them?

 

[cumminsforlife]

I was ganna have them done yes.

 

[murphy41]

I wouldn't think itll "blow through them" un coated, but even more unlikely if coated. There are guys running the .250 mark on reliefs and getting away with it.

 

[DISTURBED]

Just my opinion. I think coating stock pistons is a waist of money