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E46 Engine Swaps
Replacing your motor? From direct replacements to more exoctic engines, if it's going under the hood of an E46 3 Series this is the forum to discuss it.

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Old 05-23-2019, 08:29 AM   #1
iamanonymous
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Build/swap possibilities? Will s52 block bolt to m52tub25 head?

So I have a blown head gasket on my 1999 323i motor. Cylinder 6 took a crap on me and has 120 compression.

I want to do a very basic turbo build like I had on my 1998 e36 m3.

I want to ditch my stock aluminum block and bolt my head, intake, and exhaust manifolds to an s52 block (or m50, m52, or s50 us).

Is it possible? Any mods needed? I can build and tune, I want to keep all e46 sensors and functionality. I cannot fabricate. I can only cut, move, adapt, and assemble. I cannot weld and have no access to making custom brackets or anything.
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Old 05-23-2019, 09:39 AM   #2
infoboy
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I dont think the block of s52 would fit on m52tu head,but you can use the s52 internal and move them to the m52tu block.

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Old 05-23-2019, 10:45 AM   #3
iamanonymous
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I dont think the block of s52 would fit on m52tu head,but you can use the s52 internal and move them to the m52tu block.

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That is good to know.

I want the iron block. Has anyone tried this?

I can see a slight issue with the thermostat housing for sure. Other than that???
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Old 05-23-2019, 10:52 AM   #4
infoboy
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That is good to know.

I want the iron block. Has anyone tried this?

I can see a slight issue with the thermostat housing for sure. Other than that???
As i know the head of the m52tu/m54 has different and more holes for water cooling than old heads used in e36's so these holes of the m52tu wouldnt align with the s52 block

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Old 05-23-2019, 11:04 AM   #5
iamanonymous
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Originally Posted by iamanonymous View Post
That is good to know.

I want the iron block. Has anyone tried this?

I can see a slight issue with the thermostat housing for sure. Other than that???
As i know the head of the m52tu/m54 has different and more holes for water cooling than old heads used in e36's so these holes of the m52tu wouldnt align with the s52 block

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What if I used an s52 headgasket and "siliconed" the timing cover section? Or visa versa.

I'm used to building frankenmotors.
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Old 05-23-2019, 12:23 PM   #6
infoboy
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What if I used an s52 headgasket and "siliconed" the timing cover section? Or visa versa.

I'm used to building frankenmotors.
I dont think this is a good idea and i dont think anybody did this.and since the holes of cooling water are different in the heads its different between the 2 blocks too, so you will have problems of cooling.

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Old 05-23-2019, 12:25 PM   #7
iamanonymous
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Originally Posted by iamanonymous View Post
What if I used an s52 headgasket and "siliconed" the timing cover section? Or visa versa.

I'm used to building frankenmotors.
I dont think this is a good idea and i dont think anybody did this.and since the holes of cooling water are different in the heads its different between the 2 blocks too, so you will have problems of cooling.

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I guess I could look at both head gaskets...
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Old 05-23-2019, 12:32 PM   #8
infoboy
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Do what ever you want but in my opinion this a waste of time,unless you swap the block internal cranckshaft...

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Old 05-23-2019, 12:42 PM   #9
iamanonymous
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Do what ever you want but in my opinion this a waste of time,unless you swap the block internal cranckshaft...

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In this scenario, the only m52tub25 parts will be all the sensors, and everything that is attached to the head. Basically I would be bolting an entire s52 block, clutch, flywheel, transmission, and at least part of the driveshaft.

My goal should be to run this all with the ms42 and not lose any AC or cooling system functionality.

I understand there may be substantial differences in the cooling passages which may be the final nail in the coffin.
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