4G Conrod Advice

Singles, twins and fours.
malcolm.johnson
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Re: 4G Conrod Advice

Postby malcolm.johnson » Tue Dec 11, 2018 10:42 am

For this next rebuild, I am persuaded to replace the old rods too. I need a camshaft, pistons etc. so better get saving up.

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paul.wirdnam
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Re: 4G Conrod Advice

Postby paul.wirdnam » Wed Dec 12, 2018 7:36 am

malcolm.johnson wrote:This is a subject that I will have to address in due course and I understand that the club spares scheme gives a part exchange of £25/rod, for old style rods. I presume the club then sells these "old" rods on, but to who, if it is such a bad idea to use them? Is connecting rod failure on a Sq4, more due to lubrication failure/blocked oilways rather than metal fatigue? Have many owners had old rods fail in a newly well cleaned and assembled Sq4 engine. I do not ride old bikes very hard, but if I did new rods may well be a sensible plan.


I spoke to Bruce yesterday and, just to clarify, the Club does not accept the white metalled conrods in part exchange (£25/rod) for the new Club rods...it's only the later shell-based rods that are open to this offer.
'28 Model B (future project), '30 Model F, '31 SF31, '35 4F, '38 VB (abandoned project), '39 4G (current project), '46 VH, '48 KG

Paul

malcolm.johnson
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Re: 4G Conrod Advice

Postby malcolm.johnson » Wed Dec 12, 2018 10:38 am

Strange that. Are the crankcases which house white metal rods not worth protecting by this exchange incentive. Isn`t the scheme designed to save ALL crankcases, regardless whether they are 1939 or 1948, which are identical as far as I can tell?

john.whiting
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Re: 4G Conrod Advice

Postby john.whiting » Wed Dec 12, 2018 11:59 am

In view of the foregoing,its obvious that the old rods are sold on for reconditioning.If the rods were discarded ,then it would make no difference which kind of rod.Anyway,who pays 100 quid for something then throws it away.Certainly no one from Birmingham.

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paul.jameson
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Re: 4G Conrod Advice

Postby paul.jameson » Wed Dec 12, 2018 8:59 pm

I think you will find that the rationale is rather simpler. To re-whitemetal the early rods will cost more than a set of new rods. So they automatically exclude themselves from further use. On the other hand, shell rods could be used again for zero extra cost.
Paul Jameson
36 4G, 37 VH, 53 ex ISDT KHA (project), 54 KH(A), Healey 1000/4 (project)
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.

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alan.moore
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Re: 4G Conrod Advice

Postby alan.moore » Wed Dec 12, 2018 10:07 pm

So...do the exchange shell rods get reconditioned or are they scrapped?
1939 VH Redhunter;1942 RN WNG;1951 Triumph 6T Thunderbird;1970 BSA B175 Bantam;1986 Yamaha SRX600 single
http://cloggymoore.wix.com/triumph-pre-unit-6t

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dave.owen
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Re: 4G Conrod Advice

Postby dave.owen » Thu Dec 13, 2018 12:31 am

They are scrapped.

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paul.wirdnam
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Re: 4G Conrod Advice

Postby paul.wirdnam » Fri Dec 21, 2018 6:19 pm

I took everyone's advice and a package arrived from Bruce this morning. They are now on the tree:

Image
'28 Model B (future project), '30 Model F, '31 SF31, '35 4F, '38 VB (abandoned project), '39 4G (current project), '46 VH, '48 KG

Paul

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Eero.Korhonen
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Re: 4G Conrod Advice

Postby Eero.Korhonen » Sat Dec 22, 2018 3:06 pm

That is so nice Paul!
Br, Eero
Ariel VH 1954, IZH 350 1962, H-D Sportster Hugger 1992, AOMCC Member 133

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Re: 4G Conrod Advice

Postby Paul_Linden » Sat Dec 22, 2018 4:41 pm

Deck the halls with rods of alloy, fa la la la, fa la la la! (to parody the Xmas song - sorry about that)
Ariel Square 4 mk2, Ariel Square 4 mk3 (yes, really), Ariel Colt, Matchless G12, BSA C12. Room for one more......


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