1969 Porsche 911S - MAHLE 80mm c/r 9.8:1 Photo Gallery by 914-6 GT at pbase.com

1969 Porsche 911S - MAHLE 80mm c/r 9.8:1

...Now very rare 80mm MAHLE pistons for a 69' Posche 911S. Hi performance, almost a racing part available for one year only, the compression was 9.8:1 and one can use these for a hot-rod two-liter engine using pump gas, either single or dual ignition will work fine.

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1969 Porsche 911S MAHLE 80mm - Photo 7	1969 Porsche 911S MAHLE 80mm - Photo 8	1969 Porsche 911S MAHLE 80mm - Photo 9	1969 Porsche 911S MAHLE 80mm - Photo 10	1969 Porsche 911S MAHLE 80mm - Photo 11	1969 Porsche 911S MAHLE 80mm - Photo 12
1969 Porsche 911S MAHLE 80mm - Photo 13	1969 Porsche 911S MAHLE 80mm - Photo 14	1969 Porsche 911S MAHLE 80mm - Photo 15	1969 Porsche 911S MAHLE 80mm - Photo 16	1969 Porsche 911S MAHLE 80mm - Photo 17	1969 Porsche 911S MAHLE 80mm - Photo 18
1969 Porsche 911S MAHLE 80mm - Photo 19	1969 Porsche 911S MAHLE 80mm - Photo 20	1969 Porsche 911S MAHLE 80mm - Photo 21	1969 Porsche 911S MAHLE 80mm - Photo 22	1969 Porsche 911S MAHLE 80mm - Photo 23	1969 Porsche 911S MAHLE 80mm - Photo 24
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914-6 GT		02-Aug-2010 19:03
That also makes sense Dirk, so you could be right in that both pistons are the same and the only difference being the combustion chamber of the 911S and the 906 head... Thanks again! Armando

Dirk		02-Aug-2010 19:02
Hi again, you are absolutely right, the ratio is higher, but there`s only a difference between 9.8 to 10.5 and i think, that Porsche have done this by reducing the cylinder head as they have had recommended in their information regarding porsche vehicles used for sports purposes. That`s my opinion, but not for sure best regards Dirk

914-6 GT		02-Aug-2010 17:58
Hi Dirk and thank you for the post. Hope you’re doing well. I believe the 69’ 911S pistons are of lower compression since they were designed for consumer grade gasoline, not for actual competition racing. The compression ratio of a 906 should be much higher and the reason why the 906 has double ignition (twin-plug). When I measured the pockets of the pistons in my website, the intake was 43mm. They look like 906 pistons to me and would have to compare the compression ratio between the two model engines. Best wishes!

Guest		02-Aug-2010 17:38
Hi Armando, in my opinion the pistons of 69` S and C6 are the same, but the cylinders are different , C6 has chromal with micro pores inside best regards Dirk

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