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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 10-28-2012, 01:32 PM   #101
winstontj
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Are the ///M cooling systems simply better? I'm a new e46 owner and based on the very few and limited posts I'm wondering if the M cooling system is in fact better than a non-M system, and, would an M cooling system fit directly into a non-M chassis?

Or would that be an exercise in futility? I'm still not understanding if the preventative (dare I say "required") maintenance is something due to poor original OEM parts and the subsequent parts are deemed "better" (which some posts suggest) or if the replacement parts are similar/same (or not much better) than the OEM therefore it's just replacing crap with crap.

I come from a 2002, e21 and e30 background where there are plenty of aftermarket "upgrades" (all-aluminum radiator with extra cores + electric fan + manual fan delete for example) which end up killing two birds with one stone - radiator upgrade + belt fan delete = better cooling + more HP/efficiency.

I know there is a ton of crap on/in the e46 that would simply be gutted out of a race car or even just to revert back to the standards of the 70's, 80's or 90's so is it simply not possible to just add a decent performance radiator/cooling system and upgrades? Are things like this even made?
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Old 10-28-2012, 01:43 PM   #102
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The M cooling system is just different than the M5x cooling system. It's not that it's better, but it's more reliable. Also more expensive...have you seen the cost of a water pump on an S54?!
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Old 10-28-2012, 01:48 PM   #103
winstontj
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The M cooling system is just different than the M5x cooling system. It's not that it's better, but it's more reliable. Also more expensive...have you seen the cost of a water pump on an S54?!
No, and I don't even know if it would fit in a M5x engine. I was just curious about things like the expansion tank, etc.

My only M to non-M experience is with the S14 vs. M10 engines in 2002's and e21's - pretty much plug & play since everything is easy on both motors and cars/chassis.
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Old 10-28-2012, 02:30 PM   #104
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I think the M expansion tank works like your traditional one in which coolant from the radiator overflows into it as it expands, rather than the system we have which...I don't know does it do that? All I know is the cap vents and we don't have that line going from the radiator like you normally see in cars.

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Old 10-28-2012, 02:32 PM   #105
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Winstontj,

With the exception of some pricey aluminium radiators and the Stewert water pump, you're basically replacing crap with crap.
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