Type 901/xx Engine Build #'s

901/02 4081108 13963: http://www.early911sregistry.org/for...68-911S-engine

Does anyone know when the 901/02 cases switched from aluminium to magnesium?

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Originally Posted by RennTyp

Does anyone know when the 901/02 cases switched from aluminium to magnesium?

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According to one source 408 0681.

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Originally Posted by 993TT

According to one source 408 0681.

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How reliable is that? Is this like the switch from 65 to 66 model year where the numbers don't run sequentially?

H

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Originally Posted by RennTyp

Does anyone know when the 901/02 cases switched from aluminium to magnesium?

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Here you go. Thanks

Allen

Many thanks Allen. Am I reading your notes correctly where it says the last aluminium engines were produced around June 9th 1968? My project was originally built in May 68 but its original engine (sadly no longer with the car) was 408 098x. I have documentary evidence (not from the factory) to suggest that it had an aluminium engine but that would be contradicted by the 408 0681 serial number for the switch to magnesium. I guess the 408 0681 engine number doesn't quite tally with the June 9th date?

A little late to this thread....but I have 909555 5964 901/05 in my Light Yellow ST. It is now a 2.7L engine with 40 Webers.

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Originally Posted by RennTyp

Many thanks Allen. Am I reading your notes correctly where it says the last aluminium engines were produced around June 9th 1968? My project was originally built in May 68 but its original engine (sadly no longer with the car) was 408 098x. I have documentary evidence (not from the factory) to suggest that it had an aluminium engine but that would be contradicted by the 408 0681 serial number for the switch to magnesium. I guess the 408 0681 engine number doesn't quite tally with the June 9th date?

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Sorry for the poor handwriting; that is (around) January 9, 1968.

-Allen-

Thanks for the clarification. All seems to point to mag. My documentary evidence may be wrong! Thanks for your help.

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Originally Posted by RennTyp

Thanks for the clarification. All seems to point to mag. My documentary evidence may be wrong! Thanks for your help.

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408 098x almost certainly was Magnesium. Perhaps the documentary evidence was mostly wishful thinking on the part of the provider :) And, btw, these numbers are from the Porsche workshop manual, official Porsche. Thanks.

-Allen-