orphage

Hello,

I recently purchased a 1981 928S ROW with an unmatching M28/16 4.5L USA engine block. It has the original CIS fuel system and I now believe the car kept also its euro intake, heads and cams.

But none of my parts are listed in the PET to help me confirm it...

My parts numbers are:

Intake body: 928 110 159 0R


Intake runners: 928 110 295 0R
928 110 296 0R
928 110 297 0R
928 110 298 0R





Cylinder heads: 928 104 346 1R



Camshaft housing: 928 105 251 1R



So do I have a 300 HP engine??

Thanks!

Orphe

waynestrutt

231HP 265 FTLBS TORQUE
ONLY M28. 11 and M28.12 WERE 300HP

Turbinesurgeon

I found the intake runners in the PET and they are for a M28/11/12 so I would assume the rest have to be off the original engine. Now adding this stuff to and 80/81 4.5l engine I do not know the HP but it’s gotta be more than the USA version.

Turbinesurgeon

I have an 82 M28/11 engine in my garage. No intake assembly but my part numbers are different on the head and cam cover. I’m sure someone with a lot more knowledge will chime in on this one

hwyengr

I would have thought compression would be different between the engines, so who knows how much power yours puts out, but you can get the ROW PET by going to the UK Porsche Classic page and downloading theirs. As you’ve found, the US one doesn’t always have the European spec parts.

Mark Anderson

Those are USA 80-82 heads

karl ruiter

Just as well, really. I have a 4.5l lower end motor, with Euro S heads, cams, and intake. Not really a good combo as the top end will not really sing without the high compression lower ends and I think you lose some of the smoothness of the 4.5l top end. I had planned on adding some boost to get to the 10:1 compression but never have and will probably end up disassembling the motor and selling off the bits.

Turbinesurgeon

If your interested I’ll sell you that M28/11 engine. It’s got everything minus the intake which you already have.