Machining Pistons.

weekendwarriorfsw32 · Sep 11, 2012

Is there a template out there that I can show my machinist on how much to take out of the bowl on my stock pistons? Was doing a little research and I can't come up with anything to show him or tell him on how much to take off the lip. Thanks

blk350on20s · Sep 11, 2012

PM dustin. He did it himself dzchey21

Dzchey21 · Sep 11, 2012

Lol my method isn't very scientific. basically make the top of the bowl the same diameter as the lower part of the bowl. I think it opens the bowl up about 5mm

blk350on20s · Sep 11, 2012

Science.....the PSA way lol

weekendwarriorfsw32 · Sep 11, 2012

You don't happen to have a picture do you?

blk350on20s · Sep 11, 2012

He does. Look in his race truck build

Dzchey21 · Sep 11, 2012

Yes

Top is just machining the lip off to match the radius...note the crack lol.

Second one is the cut with the radius put in to keep cracks from starting in the new lip.

forcefed6.4ford · Sep 12, 2012

Those were the pistons out of the old truck Dustin?

Dzchey21 · Sep 12, 2012

forcefed6.4ford said:
Those were the pistons out of the old truck Dustin?

Yeah

forcefed6.4ford · Sep 12, 2012

Dodged a bullet there hey? LOL

Dzchey21 · Sep 12, 2012

They cracked but not bad enough to hurt the block.

I really wanna pull my crew cab motor back apart and machine the pistons in it too.

Working on a spare engine now for either truck just in case

weekendwarriorfsw32 · Sep 12, 2012

Still trying to comprehend this. How much of the lip would you say is left after it was machined. I just don't want to take to much.

White_monster · Sep 12, 2012

Take the lip right off. Compression will drop from 17.2 to 16.5.

weekendwarriorfsw32 · Sep 12, 2012

Will you notice a difference with a drop like that? Like when starting and at idle?

forcefed6.4ford · Sep 12, 2012

Might haze a little more at idle. That's it I suspect.

weekendwarriorfsw32 · Sep 12, 2012

Dangit, thats exactly what I don't want. Mine did that enough to bug be with just a DPF delete. I must say 6.4's seem way dirtier then 7.3's and 6.0's. At Idle non of them haze except for the 6.4 and at night its bad with lights behind me.

forcefed6.4ford said:
Might haze a little more at idle. That's it I suspect.

forcefed6.4ford · Sep 12, 2012

Just be thankful you dont live in Canada. Fog out a block LOL

mike@haller's · Sep 12, 2012

There is no noticeable difference so far. it drops to roughly the same compression as the international pistons. I don't think anyone has had any issues with them. eriks truck has them and so does mals and neither one has any hazing issues.

Erikclaw · Sep 12, 2012

There wasn't any issues with mine. It only hazed on Eric's race tune loaded with 110's. But it was waayyy to smokey for me to run out here. Other than that I haven't noticed anything.