Bolt(s) from the blue

Cheshire Cat · Post by **Cheshire Cat** » Sat Jun 20, 2020 12:57 pm

Just been sent this by a mate of mine who is a bit of a know all and he doesn't like German cars.

DougL · Post by **DougL** » Sat Jun 20, 2020 2:38 pm

I watched that clip the other night. Strikes me as nonsense. None of us has reported any of the issues that guy is talking about.

On-Track · Post by **On-Track** » Sat Jun 20, 2020 3:05 pm

It's easy to react against someone criticising our beloved Macans so I'll restrict my comments to where I think he's just wrong.

The use of aluminium bolts with an aluminium engine avoids having to deal with the problem of bimetallic corrosion. Just fitting iron (as he called them, though they will almost certainly be steel) replacements is building up problems down the line which are harder to fix than replacing bolts.

He referred to the engine as a Porsche engine when it's actually of Audi origin. That explains why it has the same fuel pump design as other Audi engines. I don't recall any cases on this forum of fuel pump problems. In any event, there is always a possibility that American fuel has differences to European fuel. He said he quite likes Cayennes yet the 3L petrol engine in the Cayenne is the same type as in the Macan.

davewf · Post by **davewf** » Sat Jun 20, 2020 8:05 pm

Perhaps if they didnt tighten the aluminium bolts up too tight they wouldn't snap off

bennachie · Post by **bennachie** » Sat Jun 20, 2020 8:32 pm

Mk 1 Macan has a Porsche engine. Mk two is an Audi/VW lump

Kleynie · Post by **Kleynie** » Mon Jun 22, 2020 9:29 am

bennachie wrote: ↑Sat Jun 20, 2020 8:32 pm Mk 1 Macan has a Porsche engine. Mk two is an Audi/VW lump

Unless it’s diesel.

Paul · Post by **Paul** » Mon Jun 22, 2020 10:07 am

Kleynie wrote: ↑Mon Jun 22, 2020 9:29 am
bennachie wrote: ↑Sat Jun 20, 2020 8:32 pm Mk 1 Macan has a Porsche engine. Mk two is an Audi/VW lump
Unless it’s diesel.

or the 2.0

Ferdie · Post by **Ferdie** » Mon Jun 22, 2020 1:12 pm

I'm voting with davewf, anyone that has anything to do with a performance machines will know that there are advantages to Aluminium (which is a metal!

) but the design needs to be precise made and perfectly assembled in clean conditions. If you are a tractor engineer out west then steel heads, bolts, covers offer fantastic serviceability while repairing it in the field (literally). Fair enough there could well be some issue at 100kml+ that you could say are poor practice for that lifeing but since there is no franchise service lock-in the States who knows what the history is for some of these cars.

Kleynie · Post by **Kleynie** » Wed Jun 24, 2020 9:51 pm

My son has an Audi A2 which has 136k miles over 17 years. The A2 is mostly made of aluminium and it is a pleasure to work on. It’s just great not having rusty bolts and ceased nuts to deal with.
I call my Macan the large Audi A2

On-Track · Post by **On-Track** » Thu Jun 25, 2020 9:23 am

For anyone interested, the link below tells you a little bit about bimetallic corrosion.

https://www.galvanizing.org.uk/galvanic ... rrosion%20(also%20commonly%20termed,or%20cathodic%20metal%20being%20unaffected.

Where steel and aluminium are used together, there needs to be an insulating material between them to prevent the aluminium from being affected.

Bolt(s) from the blue

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