MFH 911 Carrera RSR Turbo

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daniel
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Re: MFH 911 Carrera RSR Turbo

Post by daniel »

Looks very nice !!! ...is it possible that the one lang belt is mounted the from way with the teeth pointing outwards !?
Did you sandblast or used microballons on the engine ?? ...I really like the texture.
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Re: MFH 911 Carrera RSR Turbo

Post by gp-models »

Nice update, superb detailing!
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Re: MFH 911 Carrera RSR Turbo

Post by VR2 »

Hi Daniel, the belt with the teeth pointing outwards is mounted the right way, at least according to reference pictures I've been using.
RSR_Turbo2.1_Engine.jpg
The texture can be achieved w/o sandblasting or microballons. I just prime the part with Alclad Grey Primer and then spray a very thin coat of Alclad Steel. The grey primer should still shine through the "steel" layer. That's all

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Re: MFH 911 Carrera RSR Turbo

Post by Leftkeys »

I really appreciate the view on how these little “jewels” look. But to see the workmanship and the amount of work to actually create the underlying detail, is stunning. Those of you that do this are a special incentive to me.

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Re: MFH 911 Carrera RSR Turbo

Post by sky1911 »

According to the refs, Uli is correct as I found another picture of the same setup with the tooths on the outside

https://www.maxted-page.com/expertise/recently-completed-project/1974-r13-martini-racing-porsche-2-1-rsr-turbo
Link to the whole page: https://www.maxted-page.com/expertise/r ... -rsr-turbo

And here's another car from that era with the same kind of setup: https://www.fiskens.com/cars-for-sale/P ... /11662.htm

It seems odd to me, knowing how these things usually work. Unless the belt is toothed on both sides, I don't see how it would have a reliable
connection to the pulleys it is running on. But hey.. Porsche must have thought about that, as they usually know what they're doing :)
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daniel
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Re: MFH 911 Carrera RSR Turbo

Post by daniel »

wow...great images. How cool a model with all those defects in the paint would look !!
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Re: MFH 911 Carrera RSR Turbo

Post by notime4me »

sky1911 wrote:According to the refs, Uli is correct as I found another picture of the same setup with the tooths on the outside

https://www.maxted-page.com/expertise/recently-completed-project/1974-r13-martini-racing-porsche-2-1-rsr-turbo
Link to the whole page: https://www.maxted-page.com/expertise/r ... -rsr-turbo

And here's another car from that era with the same kind of setup: https://www.fiskens.com/cars-for-sale/P ... /11662.htm

It seems odd to me, knowing how these things usually work. Unless the belt is toothed on both sides, I don't see how it would have a reliable
connection to the pulleys it is running on. But hey.. Porsche must have thought about that, as they usually know what they're doing :)
I don't think the belts were meant to have 'teeth'. The belt would probably rotate around the pulley easier because the 'cuts' along the outside of the belt would allow it to flex easier when bent.

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Re: MFH 911 Carrera RSR Turbo

Post by Moskie »

notime4me wrote:
sky1911 wrote:According to the refs, Uli is correct as I found another picture of the same setup with the tooths on the outside

https://www.maxted-page.com/expertise/recently-completed-project/1974-r13-martini-racing-porsche-2-1-rsr-turbo
Link to the whole page: https://www.maxted-page.com/expertise/r ... -rsr-turbo

And here's another car from that era with the same kind of setup: https://www.fiskens.com/cars-for-sale/P ... /11662.htm

It seems odd to me, knowing how these things usually work. Unless the belt is toothed on both sides, I don't see how it would have a reliable
connection to the pulleys it is running on. But hey.. Porsche must have thought about that, as they usually know what they're doing :)
I don't think the belts were meant to have 'teeth'. The belt would probably rotate around the pulley easier because the 'cuts' along the outside of the belt would allow it to flex easier when bent.
But then the belt could be thinner overall, I think? There is no extra strength in the thicker parts.

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Re: MFH 911 Carrera RSR Turbo

Post by notime4me »

Moskie wrote:
notime4me wrote:
sky1911 wrote:According to the refs, Uli is correct as I found another picture of the same setup with the tooths on the outside

https://www.maxted-page.com/expertise/recently-completed-project/1974-r13-martini-racing-porsche-2-1-rsr-turbo
Link to the whole page: https://www.maxted-page.com/expertise/r ... -rsr-turbo

And here's another car from that era with the same kind of setup: https://www.fiskens.com/cars-for-sale/P ... /11662.htm

It seems odd to me, knowing how these things usually work. Unless the belt is toothed on both sides, I don't see how it would have a reliable
connection to the pulleys it is running on. But hey.. Porsche must have thought about that, as they usually know what they're doing :)
I don't think the belts were meant to have 'teeth'. The belt would probably rotate around the pulley easier because the 'cuts' along the outside of the belt would allow it to flex easier when bent.
But then the belt could be thinner overall, I think? There is no extra strength in the thicker parts.
The picture of the belt shows that it has a thicker rib on either edge so the belt is actually like a ladder. The gaps in the middle that make it look like teeth can make the belt lighter and able to bend easier.
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Re: MFH 911 Carrera RSR Turbo

Post by VR2 »

interesting discussion on the belt and thanks for sharing your thoughts. Porsche was always striving for light weight so notime4me's view sounds logical to me. There are other Porsche engines with the "teeth" ouside for driving the alternator. E.g. on the type 935/76 engine of the 956. Next time when I meet with one of my Porsche contacts, I'll ask/validate the reasoning
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