These are the rods from my 89 951, are they cast?

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08-12-2013, 09:49 AM

#31

Oddjob

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Quote:

Originally Posted by Thom

Here is a picture.
Rod and piston came from a brand new short block fully assembled from Porsche. As can be seen on the picture, build year is 1990.

Came new/unused w/ a bent rod?

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08-12-2013, 10:23 AM

#32

Thom

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No, the rod was straight when new, obviously.

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08-12-2013, 10:40 AM

#33

blade7

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Quote:

Originally Posted by Paulyy

Here's something that hasn't been answered and still puzzles me about my engine.

https://rennlist.com/forums/944-turb...d-or-cast.html

AFAIK it was only the early 86 cars that definitely came with the stronger block and forged rods, I think forged rods have been found in some later cars but who knows if those engines have been rebuilt or there was a cost option to have forged from new ?. My car was built in 1990 so I may be turning down the boost and revs after reading this thread.

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08-12-2013, 11:59 AM

#34

vette951s

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Quote:

Originally Posted by 2zeroes

John - are these the brake cooling ducts you are referring to, that go through the inner fender liner:

so the 89's with cast rods don't have the brake cooling ducts?

My car has a build date of Oct 88.

Yes, those are the brake ducts I referred to. In my experience with US spec cars this is a correct statement.

John

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08-14-2013, 02:24 PM

#35

Epic2112

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Quote:

Originally Posted by vette951s

Yes, those are the brake ducts I referred to. In my experience with US spec cars this is a correct statement.

John

Well, bad news about this method of determining rods: I'll get under the car and check, but I'm quite sure my car does indeed have those ducts along with the cast rods.

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08-14-2013, 02:26 PM

#36

Epic2112

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Quote:

Originally Posted by blade7

I think I'd source a set of forged rods

That's what I'm going to do, whenever I actually get around to rebuilding this thing.

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08-14-2013, 03:48 PM

#37

blade7

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Have the ducts in my 1990 car.

Fitted them myself though

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08-14-2013, 03:52 PM

#38

lart951

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Quote:

Originally Posted by Epic2112

Well, bad news about this method of determining rods: I'll get under the car and check, but I'm quite sure my car does indeed have those ducts along with the cast rods.

yeap that method is not reliable.

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08-14-2013, 07:41 PM

#39

Dougs951S

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My car does not have the ducts, and has the forged rods. Its an 86.

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06-14-2019, 12:21 PM

#40

V2Rocket

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thought this thread the most appropriate to bump...
anybody (Jim?) have data to the cast rods fitted to some 89 and 90+ 951s holding up under increased pressure/power?

the factory thought they'd be fine for 250 bhp, but how about 300 or more?

just curious.