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Originally Posted by Arsonism
Could the purchased block (even with assumed damages) still be a candidate for the 87.5mm pistons? Do you believe that this would void the warranty on the block from BMW? Would you expect there to still be wear complications or increased oil consumption?
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It would have to be some pretty severe damage to make the block unusable to go to 87.5mm. That's .020" of cylinder wall that would have to be bad in order to not clean up if bored and honed to the next oversize. I would think your new block could still be used by you or someone else with the next size up piston, probably even 87.25mm.
It really depends on how bent the rod was and what went through the engine. A bent rod can take a lot of material off a cylinder wall if the piston is cocked sideways and going up and down in the bore.
Quote:
Originally Posted by Arsonism
That's what I've discerned and the biggest question is how much damage would reoccur with a similar failure? Basically the pistons and the block were changed out, is it conclusive just by the nature of how the motor failed the 2nd time that everything should just be scrapped from that project/procedure? They also want to use a different head as mine had been resurfaced previously.
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I wouldn't say the original engine would have to be completely scraped but anytime you are using parts from a failed motor you have to assume all the parts are bad unless you have checked them out. Bent rods are definitely something to be concerned about along with a crankshaft that isn't straight or journals that are damaged.
They really shouldn't need to use another head, yours was just resurfaced so they should be able to just clean off the gasket material and bolt it back on unless the head was hit by a piston.
Quote:
Originally Posted by Arsonism
They were wanting to continue test driving the car after they had it done for about a week or so and I reached a position where I simply couldn't wait for the vehicle (it was my only mode of transportation at the time) and I had to make it up to my duty station for military duty. When I picked it up there were still some concerns, he said to just keep an eye on it and go from there, we addressed a check engine light that was on when I was there but he tried to reassure me that it was nothing and the sensor had just gone weird on him. We worked with Epic to get the tune flashed on there and even test drove it several times with a new tune to ensure that everything was working properly. By the end it seemed things were going to be ok and we would come back to the one check engine light. Obviously, that's not what the actual state of things were on pickup.
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what was the check engine light for?