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Overhaul Porsche 931 S1 engine
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MOTANUL

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

Posted: Wed Dec 23, 2020 6:21 am Post subject:

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

bureau13

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

Posted: Wed Dec 23, 2020 3:50 pm Post subject:

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)

Carrera RSR

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

Posted: Wed Dec 23, 2020 5:19 pm Post subject:

MOTANUL wrote:

Carrera RSR wrote:

Use Total Seal piston rings.

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

MOTANUL

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

Posted: Wed Dec 23, 2020 9:36 pm Post subject:

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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