What Engine Is This?
07-25-2022 | 10:26 AM
#16
Race Car
Joined: Aug 2003
Posts: 3,691
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From: Le Mans, France
For the cars, the first production engine was number 0061 and number below were prototypes or preproduction, but I don't know if the same applies to these marine engines.
No idea also of the CR and camshafts of these engines.
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Ricardo Vega (07-25-2022)
07-25-2022 | 02:56 PM
#18
Former Vendor
Joined: Feb 2005
Posts: 15,230
Likes: 2,481
From: Anaheim
Wow, so very new. The cam chain tensioner guides are completely un-run white plastic, and the intake costing is both immaculate and still silver.
Congratulations - very well bought and used!
Looks like the boat motors had both a different type (M28.23) and a different numbering series.
Factory bulletin 8902 (1/20/1989) specifically says
"For 928 S4 cars, a new cylinder head
PN 928 104 014 03 is installed from
Engine No.: 81 K 00121 Manual Transmission, 81 K05240 Automatic Transmission"
So it seems likely your motor is the 6th boat motor of 1989, likely including any factory-used / test engines, given the engine number series is different than the cars.
Congratulations - very well bought and used!
Looks like the boat motors had both a different type (M28.23) and a different numbering series.
Factory bulletin 8902 (1/20/1989) specifically says
"For 928 S4 cars, a new cylinder head
PN 928 104 014 03 is installed from
Engine No.: 81 K 00121 Manual Transmission, 81 K05240 Automatic Transmission"
So it seems likely your motor is the 6th boat motor of 1989, likely including any factory-used / test engines, given the engine number series is different than the cars.
07-25-2022 | 05:55 PM
#21
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Joined: Sep 2010
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From: Boulder Creek, CA
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Ricardo Vega (07-25-2022)
07-25-2022 | 06:23 PM
#22
Former Vendor
Joined: Feb 2005
Posts: 15,230
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From: Anaheim
No.
These heads cracked at the base of the radius where the head washers sit.
Porsche superceeded them to a head with different construction, in this area, to eliminate the problem. (2R heads.) This design change continued into the 3R, 4R, and 5R heads.
Worth noting, the 1987 1R heads seem to be less prone to having this cracking occur than the 1988 1R heads. (My observation. We've seen many cracked 1988 heads but have not seen any cracked 1987 heads.)
These heads cracked at the base of the radius where the head washers sit.
Porsche superceeded them to a head with different construction, in this area, to eliminate the problem. (2R heads.) This design change continued into the 3R, 4R, and 5R heads.
Worth noting, the 1987 1R heads seem to be less prone to having this cracking occur than the 1988 1R heads. (My observation. We've seen many cracked 1988 heads but have not seen any cracked 1987 heads.)
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Speedtoys (07-25-2022)
01-27-2023 | 04:09 PM
#25
Addict
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From: Helsinki, Finland
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01-27-2023 | 11:40 PM
#27
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From: Peachtree Corners, Georgia
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Ricardo Vega (01-28-2023)
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Ricardo Vega (01-30-2023)
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Ricardo Vega (01-30-2023)
12-19-2023 | 01:17 PM
#30
Intermediate
Joined: Nov 2013
Posts: 38
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I'm almost positive that this engine was on auction on eBay in 2019. I know this because I wanted to buy it, and I gave the seller an offer he refused. These are rare to come across. I wanted it for my 928, and I'm glad it went to someone who will use it. The story behind these engines is that a company bought a few of them new from Porsche to make them marine-worthy. I think a total of 3 boats were made with some variation of this engine.
I eventually picked up a 'new' M28/20 engine located in Stuttgart from a guy working at the Porsche factory, and this engine served as a testing engine.
I eventually picked up a 'new' M28/20 engine located in Stuttgart from a guy working at the Porsche factory, and this engine served as a testing engine.