ET: Engine (Twin) LM 25 cylinder head brackets

oexing

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Hey, that would be great! Maybe you could stick some simple plywood of 30mm thickness to the base of the pattern for the lug for my mods so I could machine them, add some fins or so. I´d take mnimum four of them, any ideas about prices ? I´d be happy to get just cast parts, no machining required.

Vic
 

timetraveller

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I would still need to have a drawing. even a pencil sketch would give me some idea, as I do not understand where the fins would go.
 

oexing

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Allright, I do a sketch soon. I was just thinking of adding a block of alu under your pattern that I will machine to my desires later, for lightness and good looks with some small fins.

Vic
 

eglijim

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I need to acquire several cylinder head brackets, FT3s etc. , and am looking into getting some cast and machined. They would be heat treated to bring them up to a sensible strength. If anyone else out there has a potential interest in some of these then please contact me and once I know the number I can quote prices. Either on the forum, a PM or email to enw07@btinternet.com Thank you.
Ian Hamilton normally used these machined from billet on all of the Egli builds and supplied many to customers including Patrick over 20 years ago. They are also a very convenient place to attach the fixed end of a hydraulic steering damper.
 

Vincent Brake

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Yes, you are right, I am aiming to do away the long nuts under the lug and position it directly on the head, that I feel, will give a more rigid engine unit that doubles as a frame member. I am not yet in the definite design stage but think to add a few "fins" and adjust thicknesses as required so in the end it will look acceptable. Are you going to have aluminium castings or steel (heavy!!) as original ?

Vic
also to get it better: put in two hollow bushes in the headlug to the bracket, with interference fit!!!!!!!, and then just an 5/16 rod n 2 nuts, get rid of the strange ET154 with Thread in them....
2018-02-28 11.43.25.jpg
 

oexing

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In the pictures you find an idea what it could look like, just a quick wood Dremel job recently. I am busy in other places of the engine so that will be a much later project . I will have lots of position bushes from crank case to top of head brackets like Japs do, so there will be just plain 10 mm studs from the bottom and only 4 top nuts holding brackets and heads down . That may help a little to fight bending heads and out of line valve guides under heat and high combustion forces but that was not my first idea, just read about it lately here. But I could imagine shoving a piece of flat bar under the head bracket a tad higher than measured from the machined head space between fins above the center of combustion chamber up to the bracket so this will no doubt help a lot keeping the head straight. You could not do this with a bunch of high nuts and washers there, too crude to get a good measurement for that bar - or so I think. At least it is another topic for discussions.

Vic
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timetraveller

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OK Chaps. it has taken a while but the new LM 25 cylinder bracket are now cast , heat treated and machined. At the moment they are all the solid FT 3 type and the machining will be done to convert them to the slotted FT 3/2 once we know the numbers. The cost is going to be £65 each for either type, plus P&P. Please either PM me on the Forum or email me at enw07@btinternet.com
 

timetraveller

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I picked up the fully machined head brackets today, six solid and six with gaps. I can now start and send these out so will those interested please contact me again. Thank you.
 
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