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Overhaul Porsche 931 S1 engine

 
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MOTANUL  



Joined: 19 Nov 2018
Posts: 120
Location: ROMANIA BUCHAREST

PostPosted: Mon Jun 22, 2020 6:34 pm    Post subject: Overhaul Porsche 931 S1 engine Reply with quote

I plan to disassemble the engine in the fall to replace the following:
1-Piston rings
2-Piston pin
3-Connecting-rod bearing
4-Crankshaft bearing
-gaskets

If necessary, I will also replace the pistons.

The gaskets are already bought. The rest of the spare parts are more or less NLA.

exception: Connecting-rod bearing - rose pasion

Where to find the rest of the parts mentioned above?
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1980 Porsche 924 Turbo (931) diamond silver metallic/helios blue metallic
sold Porsche 924 NA 1979
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1984
Location: Somerset, UK

PostPosted: Mon Jun 22, 2020 6:43 pm    Post subject: Reply with quote

1-Piston rings - Total Seal
2-Piston pin - why?
3-Connecting-rod bearing - Mittelmotor, 'colonel' on 924OC in UK
4-Crankshaft bearing - Mittelmotor, 'colonel' on 924OC in UK, there is a guy in France on here and 924OC remaking some

You will need to do rod bolts too. From Porsche or there was some ARP for sale on here. Similar price either way.

There is a thread on 924OC regarding forged pistons if required. But there are some cast OEMs now available from Porsche at circa €250 per piston. If you do pistons then the pin will be supplied
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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
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Then www.924board.org/viewtopic.php?t=31252


Last edited by Carrera RSR on Tue Jun 23, 2020 5:59 pm; edited 1 time in total
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MOTANUL  



Joined: 19 Nov 2018
Posts: 120
Location: ROMANIA BUCHAREST

PostPosted: Mon Jun 22, 2020 7:50 pm    Post subject: Reply with quote

1. Total Seal® Piston Rings Company Sold
This company? http://www.totalseal.com/

2-Piston pin - why? - If it is not necessary, I do not change it.

3-4 Mittelmotor

Pistons - Porsche If I am lucky

Thnak you for detail info.
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1980 Porsche 924 Turbo (931) diamond silver metallic/helios blue metallic
sold Porsche 924 NA 1979
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morghen  



Joined: 21 Jan 2005
Posts: 8178
Location: Romania

PostPosted: Mon Jun 22, 2020 8:13 pm    Post subject: Reply with quote

If you change the pistons you should also machine/hone/match the cylinders.
Also, if you do this overhaul, dont forget about the head, new guides and valve stem seals, new springs, new tappets and obviously new valve seats, make sure you do a 3 angle job on the seats as i think whats on the car now is a 3 angle job, so if you change to new things make sure you match or improve the quality of whats on the car now, dont just assume new is better.
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