H677 MPB

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Re: H677 MPB

Postby steverob30 » Fri 14.07.2017, 18:41

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MUCH more importantly, I have today taken delivery of my bespoke charge cooler!
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Uk engineering IS NOT DEAD!!!
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Beautiful
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alum weld
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Why do I start these things
steverob30
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Re: H677 MPB

Postby steverob30 » Fri 14.07.2017, 19:14

As all will know, the charge cooler is vulnerable to everything you throw at it. Mine (1990 car) failed the pressure test and was in a really bad state. I foolishly thought it was 'just an air cooler' and a straightforward re-core would suffice. Oh, how wrong was I? Replacement originals are almost impossible to source in the uk let alone globally. I was quoted £1400 plus vat at 20% for a 'serviceable' unit. flea-bay want £1000 for a scavenged unit with no guarantee, so I did some research...

My new unit is fully custom built.The blades and fins have been remanufactured in all alum. The tanks have been fabricated in full alum (rather than the plastic original) and there are a few 'mods' included...fins are 8mm instead of the 'stock' thickness and there are 8 of them.

In exceptional circumstances, I can source. they aint cheap, but msg me if you are interested eh?
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Re: H677 MPB

Postby steverob30 » Fri 14.07.2017, 19:19

:D
dapinky wrote:Steve - John (B-C-N) is correct - it isn't a clown, it was Lotus!

The early cars were built with M10 bolts, but it was decided along the way that bigger would be better.

M11 doesn't exist, M12 would be too big, but 7/16" is ideal.

Item 75 in the parts book is listed as either M10x110mm or 7/16 X 4 1/2".

suspension bolts.pdf


I got a pair from Ebay when I did mine - but make sure that you get ones of the correct tensile strength - they have a different 'scale' to metric bolts, so you won't always find an 8.8, 10.9 grade etc..... (and obviously, you'll need nylock nuts to match)

Edit - try these 2 sellers....

http://www.ebay.co.uk/itm/UNF-7-16-Hex- ... HLvXz8Sujw

http://www.ebay.co.uk/itm/UNF-High-Tens ... zLg3S-8rmg

(the self-coloured ones are 'harder' than the bright zinc plated - grade 8 (or "S") as opposed to grade 5 ("A") )
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Re: H677 MPB

Postby simonbuk » Fri 14.07.2017, 23:14

Could you expand on the 'its not just an air cooler' bit please ?
Simon - Black S2. Simonthesailor

"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did. So buy an Elan" - Mark Twain.
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Re: H677 MPB

Postby steverob30 » Sat 15.07.2017, 11:20

Sorry Simon, I was referring to my previous ignorance regarding this specific piece of kit. I thought, wrongly, that I could just order up a new heat exchanger radiator core from any old supplier as long as I had the right dimensions and everything would work properly...

In essence, Yes, it is 'just an air cooler' but I now appreciate that it has the specific job of increasing the density of the air at the intake manifold to maximise combustion efficiency (and thus performance) and as a result, this piece of kit requires considerable engineering.


simonbuk wrote:Could you expand on the 'its not just an air cooler' bit please ?
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Re: H677 MPB

Postby simonbuk » Sat 15.07.2017, 12:11

Ah ok cheers !! I thought it was some special piece of Lotus technology hidden inside !!
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