kassim

I'm trying to find out what year this S4 engine is from and cant seem to find out how from the engine number....can anyone help

AO

What's the engine code?

kassim

Will let you know tomorrow...found an S4 engine at the junk yard and the guys have no idea what year car it came off...I'll pass by first thing in the morning and post it

SharkSkin

Print this out to take with you:

https://www.928gt.com/t-928engine.aspx

Hilton

Being an S4 engine, it'll be something like with M28/4x 81 J 00123

the x tells you if the car was manual or auto.

The second letter (J above) corresponds to the model year, and matches the model-year letter in the VIN. So H is 87, J is 88, K is 89 etc.

kassim

Killer thanks a bunch guys...my current engine number is M2M-12-8215080. Not sure if the M2M is a typo on my registration card....what year and size is my engine.

9x8

Should be M28/12 instead of M2M/12, I guess.

90 S-4

SharkSkin,
I checked the link you provided and didn't see my # in there ?
Any thoughts as to where else I could check to get confirmation.
FWIW, When I bought the bare block to use for a stroker project, I
was told that it was originaly intended to be used as a boat motor.
Thanks for any input..

Ben Allison

M28/23? Very strange. Nothing is listed in PET.
By "bare block" I assume you mean that the crank, rods and pistons were not included. What is the diameter of the bores?

mark kibort

00002?? isnt that preproduction?

Hilton

Weird.. must be something interesting going on there.

The K indicates its a MY '89 engine.

Hopefully Rixter or Erkka will pop up in this thread as they're the most likely to be able to shed any light on the engine series number.

If its a marine block, would be interesting to see what's different on it, as those were turbo'd engines and would possibly have Porsche's intended turbo modifications (e.g. oil squirters?).

It'd also explain why the engine number is so low.

90 S-4

Ben,
Yes only the bare block. It had been bored to 103.8 when I got it and still needed to be nicksiled. It was supposedly used at some point for a total of
3K miles (total from new) in a car then removed to be turned into a stroker
project that got canceled, thats where I came in..
It now has a 108.86 bore X 93.98 stroke

Mark,
I don't think so, but only because of what I had been told about it being
originally intended for the off shore boat guys ? Maybe Porsche has a whole
different set of part number's for boat motors ? beats me..

Xlot,
Weird for sure ! I didn't know "K" indicated 89 yr-mdl, Thanks for that.
When I was shopping for a block, way back then, I wasn't up on the engine
I.D. coding but just wanted to make sure it was of the S4 family of blocks
not the S3's . The first thing I checked when i got it was to see if it had
the squirter's (NO) so I at least figured it was an 88 mdl yr, now it appearers
to be a 89. As far as being different, it isn't, at least when Todd ( Wisconsin)
was working on it he didn't see or notice anything out of the ordinary other
than the fact that it was an extremely low mileage/hour block. I had been
looking for a low mileage block to use for the project, one that had as little
as possible metal fatigue on it. So when this one came along advertised as
only having 3K miles on it, I jumped on it and didn't pay to much attention to
the I.D. #, just wanted to make sure it was a S4 type and in good condition.
I guess it's appropriate that it's a bastard block because it's now definitely
a bastard/boostered motor that it's been turned into

kassim

What if the engine number is M28-12-8215080...what year and what engine do I have on there

9x8

If it really is M28/12, then it's Euro S 80-83 (4.7 16v 300hp engine), which came with 3-speed auto.

Mrmerlin

Kassim if you print out the link that Dave has posted it will list your engine and what car and trans it should be in