McLaren M20#73

A

Andy R

Hi Michel/Howard, the Rofgo M20 pics on their site of chassis #3 have been an immense help over the years. Will do something close to that.
Had the Rollhoop welded up by a recognised manufacturer to satisfy the the Motorsports NZ powers.. Resubmitted my Rollcage and Logbook application. We'll see where the front hoop saga goes, as MSNZ regulation states front hoops on sports cars are optional.
Been trying to find an Electroplater that has baths big enough to go thru the 3 step chroming process. May have to powder coat.
Got the wing foils back from sheet metal shop.
Andrew.
 

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M

Michel

Hi Andy
Is not advisable to chrome the Roll hoop ; prefered if you find the right guy to have it nickeled with ver specific process and being absolutly sure that all welds are continuaous with leaks at all ( they need to plounge the rool hoop in acid !!! ) so if uou did not drill "thru " holes on the right places to evacuate this acid and then the different bathes they plounge the part ( degrease and then cooper bath and then nickel bath etc you could get bad
issues with after one or two monthes leaks of residual acid or watever rusted water bath !!!
Powder coat is the safer solution ......(when electroplaing have not been organised from start with the plater due to "cavity"problems to solve)
Otherwise there in Europe ; Chrome is forbiden since many years for racing cars ; only Nickel Or Zinc Bichromate ( replacing Cadmium)
Hope this helps
In Period ; Lola , Chevron and many UK builders where using Nickel
 
A

Andy R

I did read somewhere about Chrome plating and Hydrogen embrittlement.
Will investigate more Nickel plating, there's a few places in Auckland that maybe able to handle the dimensions.
Failing that there's bright Chrome powder coating. Has anyone had parts Chrome powder coated. Does the shine last?
 
andrewrobertson

Andrew Robertson

Hi Andy,

My main hoop was integral and powder-coated satin black as part of the whole chassis. I had all my suspension arms and radius rods HPC coated and they came up well, durable and and settles down to a semi-gloss silver/grey over time. What's the MANZ drama about your roll protection? - I thought you'd been through that process. Cheers, Andrew
 
manta22

Neil

Supporter
Mic said:
Hi Andy
Is not advisable to chrome the Roll hoop ; prefered if you find the right guy to have it nickeled with ver specific process and being absolutly sure that all welds are continuaous with leaks at all ( they need to plounge the rool hoop in acid !!! ) so if uou did not drill "thru " holes on the right places to evacuate this acid and then the different bathes they plounge the part ( degrease and then cooper bath and then nickel bath etc you could get bad
issues with after one or two monthes leaks of residual acid or watever rusted water bath !!!
Powder coat is the safer solution ......(when electroplaing have not been organised from start with the plater due to "cavity"problems to solve)
Otherwise there in Europe ; Chrome is forbiden since many years for racing cars ; only Nickel Or Zinc Bichromate ( replacing Cadmium)
Hope this helps
In Period ; Lola , Chevron and many UK builders where using Nickel
Click to expand...
Chrome plating mild steel is OK, it is high strength steel alloys that suffer from hydrogen embtittlement but even those can be baked out. Electroless nickel is one alternative.
 
A

Andy R

Hi Andrew, Main Hoop will be fine since I’ve gone down the Alternate design/Engineers report route. It’s the front hoop that will be an issue.
 
A

Andy R

MSNZ notified me, my Rollcage and Logbook are approved. :) Just 1 more step..... a MSNZ scrutineer now has to have eyes on and verify the pictures are the same as the cage.o_O This added step is due to a few bods changing/adding bars etc after homologation process, so I just need to organise that and job done.
Just riveting up rear wing now..
 
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