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Cylinder head CCs volumes, pistons, block and CR


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Edited to fix some numbers...

Edited to add this info: piston pin to deck height is not given, because only the dome is referenced as a measure to visualy identify the pistons.

Edited to add a 4th type of piano tops

Edited about late block webbing

I am gathering info on the M10 variants.

Here is the CC volume of each heads.

121/121ti head: 58cc, 1972 and earlier

e12 head: 61cc, 1973 to 1975

e21 2.0 head: 60cc, 2002 and 320i, 1976 to 1979

1.8i head: 63cc, 320i and 318i 1980 to 1984

Piston DATA:

Pistons used for 121/121ti head: named "bathtub"

flat tops: 8,5:1

1,5mm dome: 9:1

5,2mm dome (but with different deck height) 9,3:1 for Ti

4.4mm dome:(but with different deck height) 10:1, early euro tii mostly with plastic intake runners

Pistons used for e12 head: named "piano top" or "grand piano top"

4 kind of pianos:

1.5-2mm dome but with 1mm recessed top piston to deck, 8:1cr early 74 49 states spec

1.5-2mm dome, 8,3:1cr, us spec, 72-74

4,5mm dome, 9:1cr (us Tii), often confused with real Tii euro pistons

6,8mm dome, 9.5:1 cr (euro Tii)

flat tops on e12 head: 8,1:1, us spec 75 49 states

turbo: 6,9:1, 3,7mm dish

Pistons for e21 2.0 head:

flat tops: 8,3:1, used on 76 us spec 49 states

domed: 9,3:1, euro only, e21 only

pistons for 1.8 head: no data yet

all pictures are from my personnal piston collection. missing: euro tii with 9,5:1

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2006 530xi, 1974 2002 Automatic summer DD
1985 XR4TI, 22psi ±300hp
1986 yota pick-up, 2006 Smart FT diesel

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From my research, the US 1.8 came with either 8.8:1 or 9.4:1 domes, depending on the year. Here is a pic of a 9.4:1 domed piston (stolen from http://www.kengineering.info/cylinder%20head.html)

BMWpistondome.jpg

As I've had it described, the difference is the dome size. Not sure on the Euro engines though.

Oh, and finally some combustion chamber info... you are now officially my hero

73 Sahara

76 S52 swap of dooooooooom

01 540i-6

90 Range Rover classic (because 02s just weren't masochistic enough)

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From my research, the US 1.8 came with either 8.8:1 or 9.4:1 domes, depending on the year. Here is a pic of a 9.4:1 domed piston (stolen from http://www.kengineering.info/cylinder%20head.html)

BMWpistondome.jpg

As I've had it described, the difference is the dome size. Not sure on the Euro engines though.

Oh, and finally some combustion chamber info... you are now officially my hero

this looks like it is for the e21 2.0 head.

i have a bunch of 1.8 pistons, i will update my list...

2006 530xi, 1974 2002 Automatic summer DD
1985 XR4TI, 22psi ±300hp
1986 yota pick-up, 2006 Smart FT diesel

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Here is some pictures of some of my block into my collection.

Pictured:

1-e21 2.0 block

2-e21 1.8 block

3-74-76 block with screwed on plug behind the timing cover

4-Tii block, notice the oil return plug next to the oil filter boss

5-70-73 block, with aluminium plug behind the front cover

6-early block with screwed on oil pick-up tube, i believe pre 70

(sequence number not real)

The major difference in the webing is only external and apply only to the later 1.8 block. All others seems to have the exact same webbing/reinforcements, outside and inside.

Once flipped, they are all the same at first sight.

Edited: late 1.8 block has less webbing internaly over the main caps, thus might be considered as less "strong" than early block. That is certainly arguable as some will say late castings are better made.

The boss for the oil filter seems to change without any consistency, some has depp passages while some others seems to be "flush".

NOTE, all years are from the VIN that is onto the block, averaged within 10 different block, so it is real.

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2006 530xi, 1974 2002 Automatic summer DD
1985 XR4TI, 22psi ±300hp
1986 yota pick-up, 2006 Smart FT diesel

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in a more clever way...

Major differences circled in red.

Note: early block has no provision for the water passage that goes to the water choke, while the Tii one has a plug. All others has a nipple.

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2006 530xi, 1974 2002 Automatic summer DD
1985 XR4TI, 22psi ±300hp
1986 yota pick-up, 2006 Smart FT diesel

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internal comparo

note: only difference from under is the absence of drilled/taped holes for the transmission braket. Absent on all E21 block, 2.0 or 1.8

Internal webing/reinforcements are exactly the same all over inside except for the late 1.8 blocks that seems to have less.

One major difference is the #3 bearing cap, all e21 block dont have the braket to support the longer pick-up tube of the oil pump.

post-119-13667597111954_thumb.jpg

2006 530xi, 1974 2002 Automatic summer DD
1985 XR4TI, 22psi ±300hp
1986 yota pick-up, 2006 Smart FT diesel

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try using the mahle catalogue

http://www.motorenteile.mahle.com/eLIZA/app/queryEngine

after doing the search on "Manufacturer : BMW / Designation : M10 "

a list shows up . (2 pages , shows detailed info about the engine , cyl diameter Ø , Engine displacement , and output ) .. click on the icons for more information , first (from left) , gives you the same info shown + Compression ratio , the middle shows you the vehicles , and the right one shows you the product details .. click on the product details and you access the related info , (you can find the dome height , piston height , a sketch for it and related info)

good for checking the info and complete the missing about Pistons ;)

Thank you sir for your effort putting all that together ;)

(maybe we can make some reference guide with putting some part numbers for the pistons and such? )

bmwfans_userbar.png

-Living in the wrong side of the world ..

Cheers

Chatroom John

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Very nice find, i looked at it all. They dont list engines specific to usa, as an example, they dont list the 2002 with e12 head and flat tops.

All 2002 engines are listed as 100hp.

2002 ti 120 and Tii 130, as usual.

All tii are listed to have 10:1, while in usa everyone knows they were 9.5:1 with aluminium intake and 10:1 only for the plastic intake ones, which are euro sourced (round tailligts Tii to say the least).

In resumee, the info pertinent to the 2002 only from the link above:

2002 usa 72-74, 8.5:1 100hp (missing info/years, not aware of any 8.5:1, but rather 8,1 or 8,3 or 9 or 9,5)

2002 Ti, 9,3:1 120hp (correct info)

2002 Tii, 70-75, 10:1, 130hp (missing info)

2006 530xi, 1974 2002 Automatic summer DD
1985 XR4TI, 22psi ±300hp
1986 yota pick-up, 2006 Smart FT diesel

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at least you can use their piston deck sketches and measurements ;)

thanks, but these measurements are already into the faq.

plz try to not load that page with "no info" reply.

what we miss is hp for all m10 variant for 2002 2L.

2006 530xi, 1974 2002 Automatic summer DD
1985 XR4TI, 22psi ±300hp
1986 yota pick-up, 2006 Smart FT diesel

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