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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 03-05-2012, 01:50 PM   #1
ZeroSum
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The dangers of overboring an M54

Picked up my M54 block from the machine shop - had it overbored .5mm to 84.5mm.

Found this when cleaning it up:





Yes that is a casting flaw in the cylinder liner, exposed after boring / honing.

Currently looking for a new block
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Old 03-05-2012, 02:13 PM   #2
Rob43
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What are we looking at ?

Is that a hole that goes straight through to the water jacket, or just a small hole that stops & does NOT go all the way through, maybe about 1mm inward ?



Rob
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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 03-05-2012, 02:34 PM   #3
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Does not goes all the way through, approx 1/3 into the liner and opens out on the inside. If it was further down the bore I might have risked leaving it but it sits directly over the oil ring.

Until it happens to someone else I think we can say I am just unlucky?
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Old 03-05-2012, 04:00 PM   #4
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Sleeve it and apply boost.
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Old 03-05-2012, 04:07 PM   #5
xixixi
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I wouldn't have gone this route. I would abandon this block. Keep the motor mostly stock, if anything an intake cam change. Edit: if you need a cheap block PM me. I can break one down for you.

Last edited by xixixi; 03-05-2012 at 04:44 PM.
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Old 03-05-2012, 05:20 PM   #6
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Sleeve it and apply boost.
Sleeving is an option, but it's cheaper for me to get a new block, plus my machinist said it might not work (distortion). Boost is planned

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Originally Posted by xixixi View Post
I wouldn't have gone this route. I would abandon this block. Keep the motor mostly stock, if anything an intake cam change. Edit: if you need a cheap block PM me. I can break one down for you.
Yeah ..... I don't know what to say, I don't even remember when my engine was stock it was that long ago. Pretty sure I have sourced a block, but thanks for the option.
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Old 03-05-2012, 05:33 PM   #7
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Quote:
Originally Posted by ZeroSum View Post
Does not goes all the way through, approx 1/3 into the liner and opens out on the inside. If it was further down the bore I might have risked leaving it but it sits directly over the oil ring.

Until it happens to someone else I think we can say I am just unlucky?

Before giving my thoughts, two questions:

1) Is that pic. of two different holes, the pictures look slightly different ?

2) What is the approximate length & width of in mm, (2mm X 1mm); bigger or smaller ?


Rob
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SUMMIT POINT WV 1:24:229 S.C.C.A.
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"Chance Favors The Prepared Mind"

Need Help With Your Nitrous Ambitions ?.....PM ME
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 03-05-2012, 06:19 PM   #8
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Rob, appreciate your thoughts - the 2 pictures are of the same hole, I would say the hole is at max 1mm x 0.5 mm wide probably less but it looks like it could get bigger as it hollows out.
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Old 03-05-2012, 07:48 PM   #9
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Rob, appreciate your thoughts - the 2 pictures are of the same hole, I would say the hole is at max 1mm x 0.5 mm wide probably less but it looks like it could get bigger as it hollows out.

I talked to my motor builder today & mentioned your hole on a side note. I asked him: "assuming the hole doesn't go through & it was Very small (2mm X 1mm), could the block still be used", answer, Yes. Keep in mind he never looked at any pics, but I did give a good description.

My personal thoughts would be to either: 1) Run it as is. 2) Buy a bottle of Moroso Ceramic Engine Sealer & fill the hole, then use a heat gun to seal it.

I'd keep & run that block.


Good luck in your decision,
Rob.
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SUMMIT POINT WV 1:24:229 S.C.C.A.
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"Chance Favors The Prepared Mind"

Need Help With Your Nitrous Ambitions ?.....PM ME
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 03-06-2012, 12:23 PM   #10
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Thanks Rob, I wish I had held off getting a new block but it will be here on Thursday now.
Anyway I have always wanted an engine block coffee table
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Old 03-06-2012, 02:15 PM   #11
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VAC Motorsports has sleeves: http://store.vacmotorsports.com/vac-...-mm-p2442.aspx
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