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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

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 10-10-2014, 02:33 PM   #1
JDUTHIE
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Join Date: Oct 2009
Location: SEATTLE
Posts: 620
My Ride: 2003 325xi
ayone wanna help me figure out this cr?

m52 block.
s50b30us pistons.
135mm rods.
84mm (328) crank.
non vanos head.

sooo AFAIK

head cc= 33
bore= 86mm
stroke= 84mm (m52b28) crank
so bassically its an s50 with 1.8 mm removed from the stroke? from what I can get i should be at 9.5ish CR? am i super farr off/any input?
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Old 10-10-2014, 02:33 PM   #2
JDUTHIE
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Join Date: Oct 2009
Location: SEATTLE
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My Ride: 2003 325xi
i have the block etc, all dissasembled if anyone wants any other measurements too...
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Old 10-10-2014, 03:44 PM   #3
HakenTT
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Location: gross deutsches reich USA
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My Ride: 323i with S54
yeah like 9:1 but with bad quench
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Old 10-16-2014, 12:41 AM   #4
JDUTHIE
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I was under the impression that squish didnt really matter with FI? Only thing that comes to mind is a hot spot on the cylinder exposed wall? Any inputs cool, thanks
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Old 10-16-2014, 12:42 AM   #5
JDUTHIE
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sorry i should have been more specific about why i was trying to get comp numbers
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