M117 Euro vs US parts - Page 2 - Mercedes-Benz Forum

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post #11 of 15 (permalink) Old 09-24-2015, 01:36 PM
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Tons of help there Tony! Thank you! Something for me to study too. The inch / minute symbol in the 0.040". That represents inches. Correct? So that's a little less than 1mm from the deck (engine block top) height. Right? If so, there's no sense in me trying to look up from pictures. I've got a lot to learn here including what the "squish" is. The tops of those pistons look like they have cutouts a lot deeper than 0.040". I need to re-read all this.

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post #12 of 15 (permalink) Old 09-24-2015, 01:44 PM
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Ok. I can get a better view here to determine that they are in fact bowls or concave aspects of the m116 3.5 pistons that I guess allow the piston top to go higher than the flat pistons.
http://www.mbclassics.de/index.php?a=4568&lang=eng
M117 Euro vs US parts-imageuploadedbyautoguide1443123786.338936.jpg

I assume the 4.5 pistons are the same.

So... If someone wanted to keep their 4.5 a numbers matching original car, I wonder if they could just get the 4.5 pistons (and crankshaft?) and stick them in a North American block along with some 3.5 heads. Hmm...

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post #13 of 15 (permalink) Old 09-24-2015, 02:00 PM
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M117 Euro vs US parts

I was browsing online pictures and see a few listings on ebay for a few different styles of m117 pistons...

http://pages.ebay.com/link/?nav=item...d=151721418787
^^ pretty similar to the euro ones above, but scallops on both sides. Strange. Universal pistons for maybe a m119 4-valve engine?

http://pages.ebay.com/link/?nav=item...d=321854404789
^^ big dome and scallops for valves on both sides.

http://pages.ebay.com/link/?nav=item...d=262059241402
^^ completely flat

I've got to go confirm that the ones that came out of my 1972 (manual window) 350sl 4.5 part out were flat top. I had just tossed them all in a box when I tore down that good running engine.
http://pages.ebay.com/link/?nav=item...d=251715902443
^^^ edit: confirmed flat top pistons

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Last edited by Fonzi; 09-24-2015 at 02:08 PM.
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post #14 of 15 (permalink) Old 09-24-2015, 02:45 PM Thread Starter
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Here are the specifics on the M117 piston options.....yes there are a lot of them.
Attached Files
File Type: pdf pistons.pdf (668.0 KB, 68 views)
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post #15 of 15 (permalink) Old 09-24-2015, 03:42 PM
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As you can see the 117.984 flat top piston is 4mm down the hole at TDC. So the piston shape alone does not dictate the effective dish volume but the "projection" and "recess" come into play also. The "Quench" and "squish" discussion is probably not an issue to be concerned with but here is an interesting discussion:

http://www.crankshaftcoalition.com/wiki/Quench

Tony
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