STI internals ?

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Jul 31, 2003 | 06:57 AM

#16

Mandra

Guest

Posts: n/a

Quote:

Originally posted by jtibbitt
A subaru rep sent this message back to me.
I have been advised by our Technical Services Department that the pistons in the STi engine are forged steel. The conrods and crank are forged aluminum.
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The Car Connection article quotes, "The pistons beneath those valves are made of forged aluminum alloy, while the connecting rods that move the pistons are made from forged, high carbon steel."

Somebody got it wrong, but with the two similar answers, it also seems like one of these descriptions is right.

Hehe I really hope it's the latter that is correct. The thought of an aluminum crank is really funny (read insane)

Aug 1, 2003 | 09:46 AM

#17

gforced

Registered User

Joined: May 2003

Posts: 42

From: Dallas

I just got this from SOA:

Thank you for visiting the Subaru Web site and for your inquiry. The 2004 WRX STi is equipped with forged steel pistons and forged aluminum conrods and crank. It is also equipped with sodium filled exhuast valves.

I don't know about the forged aluminum crank, that makes me nervous. Anyone Mechanical Engineers with some insight.

Aug 2, 2003 | 03:16 PM

#18

awilson529

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Posts: n/a

Quote:

Originally posted by jtibbitt
A subaru rep sent this message back to me.

__________________________________________________ __
Hello Jeff:

I apologize for the delay in getting back to you. Your patience is appreciated. I have been advised by our Technical Services Department that the pistons in the STi engine are forged steel. The conrods and crank are forged aluminum.

Thanks for the opportunity to be of assistance. If you need any future assistance, please feel free to contact us again.

Best wishes,

John J. Mergen

Subaru of America, Inc.
__________________________________________________ __

The Car Connection article quotes, "The pistons beneath those valves are made of forged aluminum alloy, while the connecting rods that move the pistons are made from forged, high carbon steel."

Somebody got it wrong, but with the two similar answers, it also seems like one of these descriptions is right.

Obviously, the Subaru tech guy is wrong.
My reasons:

1. Forged steel pistons? no way... THEY DONT MAKE STEEL PISTONS.
2. Forged aluminum conrods and crank? Dont think so either.

Obviously, Subaru is telling people what they want to hear.

Deffinately not steel pistons and aluminum conrods and crank, but most likely the other way around.

Aug 3, 2003 | 02:06 PM

#19

gforced

Registered User

Joined: May 2003

Posts: 42

From: Dallas

The subaru guy had it backwards. Talked to my salesman at Huffines and he said it has coated forged aluminum pistons, and forged steel crank. Sorry about the mistake.