What Engine Is This?
Thread Starter
Racer
Joined: Jan 2013
Posts: 269
Likes: 21
From: El Paso, Texas
What Engine Is This?
I managed to buy this boat engine and instal into my 1987 S4, but before I got it I did as much research I could online and even reaching out to Porsche directly and all they had was a brochure of basic specs. Nothing informative. Does anyone out there know more? Anyone else have one or had on boats or cars? What do the serial numbers on block mean?
Let me know thanks.
Ricco
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From: Roswell, GA
Nordschleife Master
Joined: Jun 2006
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From: ɹəpun uʍop 'ʎəupʎs
K would be a 1989 year motor, so 2R heads and the longer head bolts at the corners.
Out of interest - did you take the oil pan off? Was there anything unusual in the sump? Asking as there was a mystery crank oil scraper which turned up years ago on ebay (there's a thread somewhere here about it), and suspicion is it was a marine part.
Out of interest - did you take the oil pan off? Was there anything unusual in the sump? Asking as there was a mystery crank oil scraper which turned up years ago on ebay (there's a thread somewhere here about it), and suspicion is it was a marine part.
Addict
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Joined: Nov 2002
Posts: 298
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I'm thinking you have a piece of history there!
https://www.stuttcars.com/wizeman-wp...e-engine-1986/
https://www.stuttcars.com/wizeman-wp...e-engine-1986/
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Thread Starter
Racer
Joined: Jan 2013
Posts: 269
Likes: 21
From: El Paso, Texas
So to answer the question, yes I did buy it. I did install into my car. At first it didn’t run well and that’s because the firing order on boat engine was 1-2-7 and so on, and the cars rubbing sequence was 1-7-2. Put old camshafts and car hauls ***! New engine in my 1987! Solid performer.
Rennlist Member
Joined: May 2002
Posts: 9,276
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From: Roswell, GA
I'm thinking you have a piece of history there!
https://www.stuttcars.com/wizeman-wp...e-engine-1986/
https://www.stuttcars.com/wizeman-wp...e-engine-1986/
Not so much anymore.
Pro
Joined: Nov 2009
Posts: 552
Likes: 41
From: Park Ridge IL USA (Chicago suburb)
More info please
Very interesting engine, thanks for posting and all of the pictures.
I would be interested in hearing more about this.
Nordschleife Master
Joined: Jun 2006
Posts: 6,297
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From: ɹəpun uʍop 'ʎəupʎs
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.