atb

So this is the engine out of my '88 S4 that is going in my track car. I've had the engine in various states of disassembly while in the car ( pan off, intake off, front of engine off), but this is the first time I've had it on a stand. I was removing the pan studs I had installed on my last pan gasket install, prepping the motor for the pan spacer and OB pan that is going on. As I was working my way around the block something didn't seem right about the view, then it hit me.
Can you see what caught my eye?

Leon Speed

Piston #8 wants to get close and personal with mr. Crank.

Squirter holes on piston #7.

Wait, it's trick question. The oil pressure sender adapter looks weird.

I give up.

Ranfurly

Well beyond me....

jcorenman

S4 motors have nuts, GTS motors have bolts (machine screws).
So this must be a GTS motor.

ptuomov

He lucked out, though. It doesn't have a GTS crankshaft, it's got the (better) S4/GT crankshaft. ;-)

Vilhuer

'93-95 MY GTS has bolts. Not '92 including early '93 US cars.

That engine has been fully open some time after summer 1992.

Bilal928S4

And I was going to say it is upside down.

Tom. M

Just looked at the pics of the underside of my track car engine (91S4)...it has nuts... so this must be a GTS engine LOL.... except for the fact that the dyno results from this particular engine don't support that conclusion...

Adams engine also is missing the engine number/ serial number (just a blank machined face where it should be). Suspect jim bobs porch repair just grabbed whatever they hand on the shelf when they replaced the whole engine after it came in for an oil change LOL...

and a pic of mine for reference..

ptuomov

Does the block have the additional, round breather holes in the main webs?

James Bailey

no numbers usually means a replacement block from Porsche....

FredR

I can vouch for the bolts on GTS motor- I have a sack load of them upstairs taken from my TBF'd [original GTS] motor [trashed before I purchased the car and put my S4 motor in it].

Regards

Fred

UpFixenDerPorsche

Girdle web showing perilous looking TB wear.

Dave928S

I think you might be looking at the non concentric machining marks that you'll see on all motors, which are often thought to be from crank throws 'planing' the side of the main bearing 'cap' web of the girdle.

The pic below shows typical machining, which is not concentric with the crank centreline, which it would have to be if it was scoring ....

atb

And Jim is correct! (About the bolts vs. studs, not the GTS part )

Yes, this is apparently a warranty block. So if this is post '92 build, that means that Porsche warrantied this motor 4 years after the car was sold? Is that possible, or did a third party find the motor and install it? What was the original warranty, any idea?

And it is otherwise all S4 inside, late model rods, no ports in the webbing.

atb

Okay Leon, I will admit that I looked for these and the early version forged rods hoping that someone at the factory decided to throw all the good parts they had lying around to build this motor.