??? on engine block

[porscheboi928s/c944t/n]

Hi all!!!

Is the engine block of an N/A the same as the turbo??? ...i know that the block itself is the same...but what about the cylinder wall???

TIA

[Britwrench]

Yes, basically same year, same block.
There are some minor differences to the
oil pressure releif valve area. As long as you use a 1985.5 block or newer it will work.

[Scott R]

Brit- I thought there some more differences than that? But maybe I am misinformed. Like stronger connecting rods? And some other innovations. I also thought the pistons were lower compression!?!

[Britwrench]

Scott, you asked about the block, the pistons are different. I am not sure about the rods and crank, but I will find out.

[1.2gees]

The piston liners are thicker on the turbo blocks.
Ahmet

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It's all the driver...
My page over1g@hotmail.com
Porsche owners Gallery.../My 944

[porscheboi928s/c944t/n]

So what is really the scoop here???

I have a spare motor and it runs verygood except that one of the ears on the block (bell housing mount)is cracked.....i know that it can be welded...i am just weighing myself if i will just get an N/A block if cylinder wall is the same quality/finished as the turbo....

T.I.A....again...

[Mrmerlin]

[QUOTE]Originally posted by
Hi Bro, it sounds like a trip to the welder will fix your problem, the engine block is different from a Turbo and a NA, also the Turbo crank and rods and pistons are stronger,
I would get it welded make shure the ground is placed near the ear of the weld so the elex wont flow thru the block and weld your rings to the walls......Stan

[1.2gees]

For the same years, the turbo and the NA 2.5 cranks are the same.
Ahmet

------------------
It's all the driver...
My page over1g@hotmail.com
Porsche owners Gallery.../My 944

[Mrmerlin]

Originally posted by 1.2gees:
For the same years, the turbo and the NA 2.5 cranks are the same.
Ahmet
Hi Ahmet, I was informed from a Porsche Dealer mechanic that races a 944Turbo that the crank has additional heat treating done to it, to verify this you will need to look at the rod and main bearing journals on the Turbo crank they will have a blue color around the adjacent areas of the bearing surfaces .It will almost look like the crank was run hot and so the crank will be discolored, however this is a normal situation for the turbo cranks.....Stan

[Britwrench]

Stan,

The part number for 944 and Turbo cranks is the same one; 944 102 015 13, which was superceeded from the 944 102 015 09.

Maybe they later ones have a different treatment but they are the same.

[Mrmerlin]

[QUOTE]Originally posted by Britwrench:
Hi Britwrench, thanks for clearing this up about the cranks ID......Stan

[T86951]

944 and 951 blocks don't have liners. They are Renolyds 360 alum and have have silicon mixed in with the aluminum. When the bores are honed the aluminum hones away leaving the silicon which is hard and really, really slick. The aluminum pistons are coated with iron/steel and iron/steel rings. The old chevy can am race cars had this aluminum material with no liners. This is why 944 and 951's about never wear rings out. Think about how slick the spray silicon out of a can is and that's basically what the rings and pistions are riding on.