BB going back together

Woowzo, looks nice!

What did you do with the carbs? Do a normal rebuild or rebush the shafts, etc?

John

 

so, everything is painted, right ? it looks so much cleaner when all the aluminum castings are a uniform colour, like you've painted them on this motor...nice job. "
I like the Cad plate on all of the fasteners, Is it just the camera flash or is it a little too brown?

 

On an expensive engine like that I would make sure to put a new thermostat on, Or maybe that is, sorry just looks a little old.
But for the money it is very cheap insurance.

 

Those side panels look a bit grubby Paul. Scotch brite will bring them up?
MG

 

Yeah don't ya just hate it when blokes tell you they'll send you things and just never get to it.

LOL

 

Hi Newman, what is the estimated cost of this rebuild to date? I will respect it if you don't want to discuss on an open forum.

With the titanium conrods from the 512M costing a staggering $751.45 EACH (and you need 12), that is a hefty price for conrods alone.

How did the price of the JE pistons (I presume they are the same for the 512 BB and 512M?) compare with the OEM 512M's pistons price wise? With the 512M's pistons costing around $359.23 each.

The cost of parts alone are very hard to digest and is giving me nightmares.

Apologies for all the questions mate..........

 

you're an artist, it's amazing to watch this boxer puzzle come together.

 

interesting pictures !!
great .
does we could know wich s/n have the BB with this rebuild to prefection engine ?
thank you in advance .

Ivo

 

So, i suppose that's the question then, isn't it ?

Understood on the pressure to deliver, but after starting this thread as a tribute to yourself, you've sort of abandoned it and left us hanging.
What were your results ? How did it run ? There's a bit of an obligation to see it through now, isn't there ?
Or is the owner an F-chatter ? Can he join in and share his thoughts ?

What about the Dino project you referenced ? Was that project completed ?

Thanks

 

am looking for some technical dimensions to base a 1/3.33 scale model of the 512BB engine,
one dimension that would really help is the crankshaft main bearing and journal diameter
another is the intake and exhaust valve diameters, and overall length
thanks,
sincerely,
Peter A Lawrence, San Jose, CA.
(you can see how serious I am by searching youtube for "lawrence merlin v12 first pop",
yes, that's a running 1/5.4 scale v12 model engine, with 4-valves-per-cylinder, that I
designed and built from scratch out of bar-stock)

 

Way cool!

 

I built 1" live steam locomotive from bar stock. Currently building 1.6" scale live steam pacific for my 5 grandsons.

 

can someone please explain what's going on in the photo in post #45 with regard to the intake ports (and spark plugs)

its clear from the access ports for the conrod big end bolts that the left bank is leading and the right bank is trailing
(IE left and right conrods are on the same crankshaft pin and the left one is ahead and the right one is behind)
you can also see this in the 3rd photo in post #1, the left head studs are ahead and the right head studs are behind

but you see the opposite with the intake ports, the right bank is leading and the left bank is trailing

and a google images search shows quite definitively that the spark plugs on the left bank are ahead of the intakes,
while the spark plugs on the right are arears of the intakes, and the 5th photo in post #1 shows the piston crown
has valve cutouts that seem to be offset from the center (to make space for the spark plug ???)

what's really going on with these heads, are the intake ports angled such that for cylinders that are forward (left bank)
the port exits the head rearward, and for cylinders that are rearward (right bank) the port exits the head forward,
that all seems weird, but so far I've only generated transverse cross section drawings, maybe this will be clear once
I generate some longitudinal drawings...?...

Flummoxed in San Jose,
Peter A Lawrence.

 

I found the first drawing on an eBay site as part of a preview page of a "512 TR users manual"

and I found the second drawing in the book I bought "Boxer, the Ferrari flat-12 racing and GT cars"


so I've taken some measurements from each and compared the measurements to the
distance from the crankshaft center to the line between the cam shafts (those are clearly
located in both drawings)

some measurements, converted to ratios, match well:
height of block (horizontally for a flat engine), and height of head (again horizontally) match well
but some measurements, converted to ratios, don't match well:
separation between the dual cam shafts (vertical), and separation between intake and exhaust ports of the heads (vertical)

the first drawing (512-TR) is for sure a TR because it has a spark plug in the center of the QV head,
but its stroke to bore ratio is wrong, so not sure how trustworthy this drawing is

the second drawing that came from the book could be either a 365 or a 512, its pretty ambiguous
as the book really wasn't about the engines it was about the cars, the drivers, and the races (sadly).
so I don't know if I trust it either.

since the 512-BB is only a 2-valve engine compared to 4-valve for the -TR, I should not be too surprised if
the angled-ness of the valves changed for the -TR and also the overall width (intake-to-exhaust width (vertical))

but I'm still not willing to assume the second drawing is actually a 512-BB, and not a 365-BB,
without some other confirmation. additionally since the second drawing is not a cross section
I have no idea what the bore (and stroke) is in relation to the block and head heights (horizontal)

this chat has a lot of great photos of a 512-BB engine, but bore and block/case height are perpendicular
so a photo won't do it, I need an actual physical measurement

anyone got any suggestions on how to resolve these issues ???
TIA
Peter A Lawrence, baffled in san jose...
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I need these as large posters in my garage.