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Overhaul Porsche 931 S1 engine
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MOTANUL  



Joined: 19 Nov 2018
Posts: 143
Location: ROMANIA BUCHAREST

PostPosted: Wed Dec 23, 2020 6:21 am    Post subject: Reply with quote

Carrera RSR wrote:
Use Total Seal piston rings.


I have already written to Total Seal. But I did not receive any answer. I later wrote to another member of the sales team - he didn't answer either.


It is possible that the size of the piston on my car is atypical (86.75) and they don't have piston rings for this size.

I managed to buy connecting rod from Romania.

Ref. the Piston rings 86.75:
It is still not 100% clear to me if the pistons rings of the Porsche 924 S2 are identical in size to those of the Porsche 924 S1. I found to buy Genuine piston rings for porsche 924 turbo S2 (86.75 mm).

For main bearings I have: https://www.mespiecesauto.com/en/produit/coussinet-porsche-924-046105501-0406105561-046105591-046198451/

I receive an answer from mittelmotor.de. They have everything (piston rings, connecting rod, main bearings) for 700 euro.


_________________
1980 Porsche 924 Turbo (931) diamond silver metallic/helios blue metallic
sold Porsche 924 NA 1979
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bureau13  



Joined: 07 Sep 2017
Posts: 349
Location: South Florida

PostPosted: Wed Dec 23, 2020 3:50 pm    Post subject: Reply with quote

Maybe a ROW vs US thing? I THINK I read that the US cars had slightly lower compression than the ROW cars, although I don't remember if that were only particular years, or what the numbers were.

MikeDanger wrote:
are you sure s2 is 8.5:1?? thought it was 8.0

944 turbo is 8.5

_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2104
Location: Somerset, UK

PostPosted: Wed Dec 23, 2020 5:19 pm    Post subject: Reply with quote

MOTANUL wrote:
Carrera RSR wrote:
Use Total Seal piston rings.


I have already written to Total Seal. But I did not receive any answer. I later wrote to another member of the sales team - he didn't answer either.


It is possible that the size of the piston on my car is atypical (86.75) and they don't have piston rings for this size.

I managed to buy connecting rod from Romania.

Ref. the Piston rings 86.75:
It is still not 100% clear to me if the pistons rings of the Porsche 924 S2 are identical in size to those of the Porsche 924 S1. I found to buy Genuine piston rings for porsche 924 turbo S2 (86.75 mm).

For main bearings I have: https://www.mespiecesauto.com/en/produit/coussinet-porsche-924-046105501-0406105561-046105591-046198451/

I receive an answer from mittelmotor.de. They have everything (piston rings, connecting rod, main bearings) for 700 euro.




Have you pulled the pistons to check size? Usually 86.5 then 86.95
Have checked the bores for wear?
S1 and S2 rings are the same
_________________
1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
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MOTANUL  



Joined: 19 Nov 2018
Posts: 143
Location: ROMANIA BUCHAREST

PostPosted: Wed Dec 23, 2020 9:36 pm    Post subject: Reply with quote

Carrera RSR wrote:

Have you pulled the pistons to check size? Usually 86.5 then 86.95
Have checked the bores for wear?
S1 and S2 rings are the same


86.75 is my size - repair stage nr.1. An atypical dimension on the verge of extinction.

Bores wear 0.01 mm

S1 and S2 rings are the same: Very happy

After a thorough cleaning, the cylinder head looks like new. The engine block, on the other hand, looks worse - it's very rusty.



_________________
1980 Porsche 924 Turbo (931) diamond silver metallic/helios blue metallic
sold Porsche 924 NA 1979
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