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Cutaway diagram of engine?

Well, I posted this in the wrong forum, maybe (engine rebuild).

Can someone point me to a cutaway diagram that would help me better understand the inner workings of the flat six?

Many thanks,
Jack
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85 911 Targa
Old 09-09-2009, 03:57 PM
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theres a cool animated cutaway of the engine running somewhere on this forum, can't remember where.
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Old 09-09-2009, 04:00 PM
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Old 09-09-2009, 04:22 PM
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i think its also lelands avitar but dont remember were else
Old 09-09-2009, 05:13 PM
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Old 09-09-2009, 06:37 PM
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Old 09-09-2009, 06:37 PM
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Old 09-09-2009, 06:39 PM
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Old 09-09-2009, 06:42 PM
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Thanks Guys...you're educating me with every reply! Jack
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Old 09-09-2009, 08:49 PM
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hey, that thing got a HEMI?
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Old 09-09-2009, 09:46 PM
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Quote:
Originally Posted by James Brown View Post
hey, that thing got a HEMI?
Do you mean the shape of the piston top in the gif file?
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Old 09-10-2009, 01:22 AM
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As far as I know, Hemi means the layout of the combustion chamber :

hemispherically-shaped

Piston shape is not relevant (at least namely)
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Old 09-10-2009, 03:44 AM
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OK... But the piston has to fit into that shape.
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Old 09-10-2009, 04:31 AM
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It is beneficial, when the piston fit's into the chamber

Seriously, turbo engines got flat pistons, non aspirated ones are like shown above. It's a question of the compression ratio.

Modern turbo engines got higher ratios today and so layout is more equal.

What you can't see on the pic, is that the room left, when piston is on TDC, is where the spark plug is located. This way pressure of combustion increases more and earlier than using a flat piston.
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Old 09-10-2009, 05:57 AM
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Yes, the 911 has a "Hemi"-spherical design, as do several other engines. Chrysler was just the best at using a relatively common engineering concept as a marketing tool.
Old 09-10-2009, 07:06 AM
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Lots of different piston dome shapes have been used in 911 engines over the years, depends on cams, induction, cr and legal constraints on emmisions

Early 89mm race piston, high dome for compression w/ large valve pockets


95mm, 8.5:1 cis emission pistons, w/ large swirl pocket


90mm 2.7RS, 8.5,


92mm bb hc piston


Flat top 930


993 100mm 3.6 emissions piston


2.7RS, 2.4T, 2.2S


3.8RS, 2.7RS
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Old 09-10-2009, 08:00 AM
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Very good information Bill. Thanks for posting.
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Old 09-10-2009, 12:28 PM
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Old 09-10-2009, 04:13 PM
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