420R (S3) Radiator design issue, regular failures???

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John Vine
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Re #60:

The S-shaped extension piece has two functions: (a) to lower the rad and (b) to move the rad backwards out of the nosecone.  It simply relocates the mounting point for the bobbin so that the new-style rad fits in the old-style nosecone. For a temporary fix, I think it's quite a neat solution, but it shouldn't be thought of as anything other than temporary. 

JV

ScottR400D
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I would agree that the best solution for that rad would be that chassis bracket turning downwards and removing the need for the extra bit. But then you do have a significantly modified chassis which Mark won't want, and heavily damaged PC. 

I'd be inclined to try to get CC to supply the original system though I guess they'll resist that strongly because it would be an admission of fault. 

L7C
CtrMint
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Me and welding there's a thought Wobble the mind boggles.

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
CtrMint
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In all seriousness, I think I'll just cut down the top of the hanger to increase the gap.  As it's been said earlier in the post, it's not possible to raise the rad due to clearance on the nose cone.  Of course I might be able to obtain a greater horizontal gap with a new rad Yes Hehe

Long term, I like the idea of taking the upright section of the chassis mount clean off, and then placing a 90 degree mount underneath, their with a weld or drilling a vertical hole through an bolt etc. That design would require very careful measurement and consideration as the proximity to the front ARB bush is also very close.

 

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
CtrMint
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First of what will be a couple of blog posts is now available.

https://www.caterham7diaries.com/post/taffia-2021-prep-goes-wrong

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
CtrMint
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Well I did it this afternoon, cut the bracket down, gained approximately 12mm in clearance,

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
CtrMint
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and the hanger, painted.  Chassis is also painted too.

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
ScottR400D
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Well that should solve that issue!

Incidentally, what's the rad set up on your 620? 

L7C
CtrMint
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It's a different design, the upper port is on the driver's side.
Part number is different too, 30C086E

 

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
John Vine
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Re #67:

Neat dremeling.

Is that a new hole as well?  If so, presumably the entire rad is now lower, or is that a corresponding new hole in the drop bracket?

JV