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I keep my undertray bolts copper greased but each time I remove them I see the effects of electrolytic corrosion on the aluminium trays and was thinking - has anyone put together a stainless bolt set?

....not only would they look good but they would remove the lingering concerns over seized bolts and corroded aluminium

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Out of interest, I fitted some of these anodised aluminium screws in place of the standard ones on the under tray of both my Elise and Exige. Never had a corrosion problem with them after that.  htt

I keep my undertray bolts copper greased but each time I remove them I see the effects of electrolytic corrosion on the aluminium trays and was thinking - has anyone put together a stainless bolt set?

Duralac is the correct product to prevent galvanic corrosion.  https://www.mbfg.co.uk/duralac.html I'd imagine vaseline would get washed away by water very quickly after application.

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Alcohol. Sex. Tobacco. Drugs. Chocolate.  Meh! NOTHING in this world is as addictive as an Evora +0. It's not for babies!    

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Forget what google will tell you don’t put stainless and aluminium together especially in any moisture type environment dissimilar metal corrosion is the result. 304 stainless is especially bad.
I’ve seen stainless turn to a black almost grease Type substance when bolted to aluminium in a drain water sump and it’s also a no no around swimming pools. 
If you do use stainless bolts you need to use a nickel based anti seize. 

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You can use a plastic paper thin washer between the stainless and aluminium can you not to avoid the physical contact point.

Alcohol. Sex. Tobacco. Drugs. Chocolate.  Meh! NOTHING in this world is as addictive as an Evora +0. It's not for babies!    

The first guy to ride a bull for fun, was a true hero. The second man to follow him was truly nuts!   

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88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

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I am in the process of removing my undertray so I can remove the 3rd cat and fit a straight through pipe.

I think the rust even surpasses what I have seen on my Esprit.  Shit the bed what a job to get it off, I am having to cut them with my dremel as the bolts are solid.  With them being hex head as well doesn't help (although one did bite enough to actually snap one of the captive nuts off of the plate it was welded onto) - very helpful.  Wheel off to get to that!

 

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  • 2 weeks later...

Always used Vaseline when using two dissimilar metals, and copper grease on the back of brake pads.

Darryl & Sue

Proud to drive and own a true British supercar the Evora GT430

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28 minutes ago, DarrylV8 said:

Always used Vaseline when using two dissimilar metals

Duralac is the correct product to prevent galvanic corrosion. 

https://www.mbfg.co.uk/duralac.html

I'd imagine vaseline would get washed away by water very quickly after application.

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88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

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On 07/09/2020 at 08:23, Lotobear said:

I keep my undertray bolts copper greased but each time I remove them I see the effects of electrolytic corrosion on the aluminium trays and was thinking - has anyone put together a stainless bolt set?

....not only would they look good but they would remove the lingering concerns over seized bolts and corroded aluminium

I went with SS button hex-head machine screws and use USS Tef-Gel PTFF anti corrosion paste.  Tef-Gel is also good for insulating CF products from SS screws and aluminum.

 

https://www.tefgel.com/contain.php?param=tefgel_infor

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OK, after five Sundays I have finally got the under tray off.  I had to butcher eight of the bolts to get them off so ordered some replacements.  I went for black stainless steel bolts from Carbolts:

https://www.carbolts.co.uk/collections/bolts/products/black-stainless-steel-button-flange?variant=8135052329078

But having read the above, not sure what I should be doing.  Am I better off using the stainless bolts I have just got using one of the products mentioned, or with factory steel bolts with some copper grease?

To add insult to injury, I was doing this to put a decat pipe on the car but having got the diffsuer off found it had already been done.  Not sure what I was most upset about, all that wasted time or the fact the sound of the car won't be improving.

 

 

 

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Stray away from copper grease, this will not prevent corrosion infant it will an electronic path.  Better to use a product such as USS Ultra Tef-Gel

 

 

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On 27/09/2020 at 21:25, Nelly said:

To add insult to injury, I was doing this to put a decat pipe on the car but having got the diffsuer off found it had already been done.  Not sure what I was most upset about, all that wasted time or the fact the sound of the car won't be improving.

 

 

 

Does this mean you've got a decat pipe going spare? :) Interested if so!

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On 29/09/2020 at 17:20, Julian73 said:

Stray away from copper grease, this will not prevent corrosion infant it will an electronic path.  Better to use a product such as USS Ultra Tef-Gel

 

 

Great stuff Tef-Gel, use it all the time on high tech racing boats especially between carbon and aluminium. 
 

Sticky as hell so don’t get it on your clothes. 

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  • 3 weeks later...

Out of interest, I fitted some of these anodised aluminium screws in place of the standard ones on the under tray of both my Elise and Exige. Never had a corrosion problem with them after that. 
https://www.ebay.co.uk/itm/M5-Aluminium-Socket-Cap-Screws-Allen-Key-Bolts-Hex-Head-Anodised-Unanodised-/282771602905

If you want to be a complete tart (ok I’ll hold my hand up😁) you can choose a colour to almost match the cars bodywork. 

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