sootie
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you two need to get a room!
live life full throttle
Ya-the kind where only one comes back out...
you two need to get a room!
live life full throttle
either way works.. lolYa-the kind where only one comes back out...
So for the sake of discussion not arguing, how do valve releifs make pistons stronger, even delipping does not make them stronger. Both are removing material thus weakening. Now delipping to remove a potential source of where a crack may start is beneficial, one is still removing material. (personally I feel by cutting valve reliefs all your doing is adding more sharp edges that you were trying to get rid of by deliping in the first place. if you don't need them, why would you want them?)
Now when delipping does everyone remove the same amount, cut the same amount for valve releifs? Etc.
I just reread, it was mentioned that cut and delipping would increase reliability, (I will leave the stronger as I'm sure people may feel it makes them stronger)but there has to be a limit, or it's just detrimental.
The Keyboard Engineer will chime in shortly............So for the sake of discussion not arguing, how do valve releifs make pistons stronger, even delipping does not make them stronger. Both are removing material thus weakening. Now delipping to remove a potential source of where a crack may start is beneficial, one is still removing material. (personally I feel by cutting valve reliefs all your doing is adding more sharp edges that you were trying to get rid of by deliping in the first place. if you don't need them, why would you want them?)
Now when delipping does everyone remove the same amount, cut the same amount for valve releifs? Etc.
I just reread, it was mentioned that cut and delipping would increase reliability, (I will leave the stronger as I'm sure people may feel it makes them stronger)but there has to be a limit, or it's just detrimental.
well personally I went with max force pistons. no valve reliefs, no coating, no modification to piston tops. They do have a " better " top of the piston vs factory. I also run a colt stage 2 cam. I have valve springs. my block nor heads were never decked. ford head gasket. only reason why valve hit pistons is if head are decked, block decked, valve train issue, lifter issue. If set up properly there is no worry, if a lifter fails or your revving it too the moon then perhaps you should have the correct springs, or change your cam profile. (lifter failure you'd have to tear down anyway, so reliefs arnt going to help much) bottom line is id switch cam profile, shorter push rods, different lifters, thicker head gaskets, anything before cutting valve reliefs. unless of course its a race engine that you plan to tear down every season to inspect. (im talking a daily driver, which tows, one takes on holidays, etc) my truck also has zero haze. (it can get down to -40 here in the winter, my truck also starts find cold, etc)
now tuning, yeah I agree. But also if one cuts a valve relief at .010" or .100" could make a difference.
that's were tuning and knowing your **** about your truck come into play. even a frozen ebp sensor due to egr ****** could cause excessive ebp.
btw ive never seen a stock 6.4 crack a piston, the most common thing I ever see on a stock 6.4 is lifter failure. my 6.4 was stock, I bought it as the guy put gas in it and drove it till it would not run. had a lot of miles and hours on it, but the guy did oil changes based upon that. (pretty smart guy until he put gas in it, lol). anyway rockers looked perfect, so I replaced the fuel system and was good to go. Only reason I tore mine apart (much later after the fuel system) was that I had a run of trucks at work that ate lifters and I didn't want mine too. Not to mention I poped head gaskets pulling big hills on a canned h&s tune. thing pulled 15,000 lbs up hill like a champ. I never pushed coolant, but would loose heat once and awhile.
Moral of my story is, stock they don't break as often as people think, as long as their maintained.
So I’d like to get some opinions on what the heck happened here. Less than 45k miles on motor #2 and boom! Cracked number 8 clean across and the other 7 have smaller fracture cracks in them. I’m at a loss. These were fly cut, delipped and coated Mahle pistons. The cracks are all right at the lip of the fly cuts on each piston. The truck was dyno’d at 630whp and is stock fuel and air. No where near a big power truck. Is it just a coincidence that 2 weeks prior new tuning was downloaded to the truck? What’s everyone’s thoughts on this? Also, I’m considering going with the maxxforce pistons this go around. Is that the best option available right now? Who’s got the best pricing? Thanks in advance for any input.