Lotus Elan

Chassis Corrosion!

PostPost by: ardee_selby » Tue Nov 15, 2011 8:31 am

No, not on the Elan!

http://www.lakesideengineering.com/Elis ... rosion.htm :shock: :roll:

Anyone on here experienced this phenomenum?

Cheers - Richard
ardee_selby
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2255
Joined: 30 Sep 2003
Location: Outta Here

PostPost by: jono » Tue Nov 15, 2011 9:02 am

Common issue on cars where aluminium and ferrous metals come together - electrolytic corrosion.

Had it on my Caterham where alloy panels meet the mild steel chassis tubes. Ask a Landrover enthusiast about it!
jono
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1633
Joined: 17 May 2007
Location: The wet bit in the top corner of England

PostPost by: elansprint71 » Tue Nov 15, 2011 9:07 am

I asked the salesman at Christoper Neil about chassis corrosion when they had the first Elise in stock. He said "I am not aware of any potential corrosion problems".... absolute classic comment!

http://en.wikipedia.org/wiki/Vickers_Valiant

"Is there a Metallurgist in the house"? :wink:
elansprint71
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 4092
Joined: 16 Sep 2003
Location: Cheshire, UK.

PostPost by: ardee_selby » Tue Nov 15, 2011 9:20 am

jono wrote:Common issue on cars where aluminium and ferrous metals come together - electrolytic corrosion.


elansprint71 wrote:I asked the salesman at Christoper Neil about chassis corrosion when they had the first Elise in stock. He said "I am not aware of any potential corrosion problems".... absolute classic comment!

http://en.wikipedia.org/wiki/Vickers_Valiant

"Is there a Metallurgist in the house"? :wink:


Yes, I do understand a bit about galvanic couples and all that jazz. My surprise was that such a common scenario had found its way into the design of the Elsie...and wondered if it was a failing particular to the UK. i.e. salty water providing the ideal electrolyte.

Cheers - Richard (NOT a metallurgist...a Metallurgical Engineer, 2 GCEs and a budgerigar )
ardee_selby
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2255
Joined: 30 Sep 2003
Location: Outta Here

PostPost by: UAB807F » Tue Nov 15, 2011 5:13 pm

ardee_selby wrote:No, not on the Elan!

http://www.lakesideengineering.com/Elis ... rosion.htm :shock: :roll:

Anyone on here experienced this phenomenum?

Cheers - Richard


Not quite as bad as that, but my elise did suffer from pitting underneath the rubber floor mats that were stuck in the footwells of every S1. And it really pee'd me off because, yes, I am supposed to be a metallurgist and I knew about Al problems but in blissful ignorance, because the car didn't leak, I never thought that water would make it's way underneath the rubber mats. Then I found they were only stuck down intermittently with double-sided tape at the edges so they could "breathe" and formed the perfect corrosion test environment..... good old Lotus.

I've not thought too deeply about their conclusions but looking at where the problems lie I'd bet it's more likely a build up or muck, salt and water that is the basic cause. Yes, replacing in 316 is fine as you can be sure the new shims won't corrode, but I'd still want to clean & waxoyl the aluminium there.

Brian
User avatar
UAB807F
Fourth Gear
Fourth Gear
 
Posts: 645
Joined: 20 Dec 2010
Location: Lincolnshire

PostPost by: jk952 » Mon Nov 21, 2011 9:11 pm

I recall they spray joints inside light aircraft wings with zinc chromate (or was it zinc dichromate :shock: ) to reduce corrosion, zinc being more sacrifical than aluminum. Readily available in a spray can. Can't say I used it on the Elan though, likely won't help the rusting rebar buried in the fiberglass :?
Jack
jk952
Third Gear
Third Gear
 
Posts: 315
Joined: 04 Jan 2011
Location: Ont. Canada

PostPost by: spanner » Tue Nov 22, 2011 5:49 pm

spanner
Second Gear
Second Gear
 
Posts: 108
Joined: 06 Mar 2008

PostPost by: 69S4 » Wed Nov 23, 2011 7:26 am

spanner wrote:http://www.aircraftspruce.com/catalog/cspages/acf50.php

Jim


I spent a messy few hours last weekend spraying ACF50 all over my motorcycles in my annual attempt to keep rust at bay through the winter. It does seem to work and it's well regarded in the bike world although there are a few reservations about it rotting natural rubber. Come the spring I'll spend an equally messy weekend trying to clean it all off and for the last couple of years I've been happy with the results. I have used it occasionally on the Elan (usually when I've got some left over from the bikes) mainly on electrical connections and I don't seem to have had as many wiring problems in recent years so maybe it is doing something. Trouble is it's hard to prove a negative and it might also be down to my excellent soldering etc skills ( :lol: ). It's cheap enough though (a ?14 can did 6 bikes and ran out on the Elan) so worth a punt as they say.
Stuart Holding
Thame UK / Alpe D'Huez France
69 S4 FHC
Honda GoldWing 1800
Honda CBX1000
Kawasaki H1 500
Yamaha XS2
69S4
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1210
Joined: 23 Sep 2004
Location: nr Oxford UK

Total Online:

Users browsing this forum: No registered users and 7 guests