Recasting Mays Heads ?

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Re: Recasting Mays Heads ?

Post by beemergb » Sun Apr 20, 2014 9:40 am

toomanysabres wrote:Dick Sherwin might like a Vincent case.
I understand one of his was 'ruined' by an elderly 'expert' who seems to have lost the plot.
Hello Youreallyhavegottomanysabres ! Yes I know the problem with experts that screw up crankases ! Thats why I had to make my own. Thank you again for the info Harry



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Re: Recasting Mays Heads ?

Post by toomanysabres » Tue Apr 22, 2014 5:38 pm

beemergb wrote:By the way any tech updates or changes you think we need on these heads would be appreciated
Yes keep the thermostat bypass tube facility.
Mine was capped and caused overheating at the back.
So I have fitted a special heater hose 4 port tap to restore permanent flow.
20130001_1.JPG
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Re: Recasting Mays Heads ?

Post by beemergb » Tue Apr 22, 2014 8:04 pm

toomanysabres wrote:
beemergb wrote:By the way any tech updates or changes you think we need on these heads would be appreciated
Yes keep the thermostat bypass tube facility.
Mine was capped and caused overheating at the back.
So I have fitted a special heater hose 4 port tap to restore permanent flow.
20130001_1.JPG

Aha ! See this is what we want ! Improve the design and make it more reliable ,Ive been inside the head with a mini camera ! Very basic and even some mini clamps left in . The flow rate inside was very small and restrictive and will be updated to modern flow rates .Thank you very much for this feedback any other improvements you would like ? Rocker gear , valves (smaller shaft( larger head size ), seats ( lead free ) better flow . Thanks again Harry
Last edited by beemergb on Wed Apr 23, 2014 8:27 am, edited 1 time in total.



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Re: Recasting Mays Heads ?

Post by scimjim » Tue Apr 22, 2014 8:15 pm

As your main market is likely to be competition cars (and not Reliants), I think you need to approach the FIA before thinking about major changes to the design? Mays/triples are accepted as period modification for most classes (or even standard fit/optional extra) but I expect an all alloy, hooooge unleaded valves, EFi, 500BHP version won't be? :-)


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Re: Recasting Mays Heads ?

Post by cookieboy » Tue Apr 22, 2014 8:36 pm

im sure kevin dipcon at zodiac motor services in Erith ,kent .would be a good person to contact regarding info or sales etc


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Re: Recasting Mays Heads ?

Post by toomanysabres » Tue Apr 22, 2014 10:40 pm

Mine is a MKIII so the valves are about as big as you can go anyway. I had it unleaded as it makes no sense not to.


Now: '62 Sabre 4, '63 Sabre Six, '65 SE4, '00 BMW E38 740i sport.
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Re: Recasting Mays Heads ?

Post by beemergb » Wed Apr 23, 2014 8:25 am

scimjim wrote:As your main market is likely to be competition cars (and not Reliants), I think you need to approach the FIA before thinking about major changes to the design? Mays/triples are accepted as period modification for most classes (or even standard fit/optional extra) but I expect an all alloy, hooooge unleaded valves, EFi, 500BHP version won't be? :-)
Thank you for your comments , I intend to make the heads optically identical outside but internally updated ,just to make them more reliable and have a better gas and water flow design ,as looking inside and outside of the Mays head I have, it needs updating ! And the three Webers on the head where standard then and are F.I.A approved I will not fit EFi ,its not period .As for competion cars ,there are a few and they have Reliant written all over them ! As seen by many other race cars following them !



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Re: Recasting Mays Heads ?

Post by scimjim » Wed Apr 23, 2014 8:48 am

I'd also suggest talking to Iain Daniels (as mentioned earlier in this thread) before re-inventing the wheel (head :-)) and/or treading on any toes?


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
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1300 SS1 (Number One) & Sarah's coupe.
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Re: Recasting Mays Heads ?

Post by toomanysabres » Wed Apr 23, 2014 8:50 am

The rear 'slot' water port needs to be a bit further from the edge of #6 cylinder. There is precious little gasket face there and it doesn't take much corrosion to cause failure. I don't think it matters if it is slightly offset from the matching hole in the block.
Another small problem we have found recently with mine and I don't think its anything to do with face machining but #6 spark plug protrudes through more than the others. We have had to put 2 spark plug sealing washers on it. Probably a casting problem or the seat machined a bit too deep.


Now: '62 Sabre 4, '63 Sabre Six, '65 SE4, '00 BMW E38 740i sport.
Prev: '53 ZephyrZodiac, '64 Sabra GT, '68 Elan S3SE, Mk3 Cortina 2000GXL, Mk4 Cortina 2000 Est, 3 SE6a's, 2 SE5a, SE4a Turbo, 1800Ti.
Company: Cav SRi, Cav SRi 130, Honda Concerto 1.6 (yuk)

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Re: Recasting Mays Heads ?

Post by Simon Drabble » Wed Apr 23, 2014 12:42 pm

very interesting and timely topic. I would be interested in costing etc.. maybe you could contact me when you are nearer to having a finished head.



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Re: Recasting Mays Heads ?

Post by beemergb » Wed Apr 23, 2014 8:34 pm

Simon Drabble wrote:very interesting and timely topic. I would be interested in costing etc.. maybe you could contact me when you are nearer to having a finished head.
Will do , I am making the head because I need one and will test it first before offering it for sale .This what not the intention but it seems we all want to go fast with our 6 pot motors and one SU carb doesnt do it .



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Re: Recasting Mays Heads ?

Post by beemergb » Thu May 01, 2014 4:35 pm

Can anyone tell me how to identify a Raymond Head I have ? Its has had the brass i.d plate removed but has two stamped in numbers , 100421 and 602624 .Hope you can ,Harry



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Re: Recasting Mays Heads ?

Post by Coupe Racing » Sat May 03, 2014 7:10 am

Mention has been made of the water ways and flow restrictions
Bear in mind some of this will be deliberate to guide coolant where it is needed


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Re: Recasting Mays Heads ?

Post by mermar74 » Sat May 03, 2014 8:57 am

If it does not have a bypass tube provision at front of head, and the rocker cover is held on by three studs at centre it is a Mk1 head. If it has a bypass tube provision and the rocker cover is retained by seven screws around its outer lip it is a Mk2 or Mk3 head.

The Mk2 and Mk3 heads are the same, but the intake manifolds differ. The Mk3 Zephyr/ Zodiac has a much lower bonnet line, so the Mays intake manifolds for these models places the carbs lower to clear.



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Re: Recasting Mays Heads ?

Post by beemergb » Sat May 03, 2014 8:59 am

Coupe' Racing wrote:Mention has been made of the water ways and flow restrictions
Bear in mind some of this will be deliberate to guide coolant where it is needed

Thank you for the info. We are going by computer animated water flow guides at the moment ,based on engines with simular sizes on inline sixes. But after analysing the original head ,dissecting ,via computer 3d animation ,the original head it was a little restritive in places ! It seems the biggest problem with the head , according to the feedback I get from owners ,is the lack of metal in some places ,hence cracking ,and the precarios lack of metal and surface contact in the area of waterways and wall thickness. All to be ,we hope ! , removed and improved in the new heads .



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