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The Brickley twin in NYT Mag section?
- Thread starter 26667
- Start date
Hadn't heard of this; looks like Austin as you suggest...touts an improvement in gas mileage while lowering emissions. Seems like the approach is to reduce friction in the engine components.
http://www.brickleyengine.com/
http://www.brickleyengine.com/
AnnapolisAirhead
--Tony
Interesting, maybe innovation is coming out of a coma. 
Isn't that a 4-cylinder though, not a twin?
Isn't that a 4-cylinder though, not a twin?
V
VANZEN
Guest
Yes, a 4 - cylinder
Yes, a 4- cylinder.
And what's more ÔÇô not a "flat 4", but a "vertical 4" ?
that is: unless the resulting rotation at the crank is somehow transposed 90?? to power a shaft or chain.
Yes, a 4- cylinder.
And what's more ÔÇô not a "flat 4", but a "vertical 4" ?
that is: unless the resulting rotation at the crank is somehow transposed 90?? to power a shaft or chain.
I heard about it, and looked at Brickley's website. I'm no engineer, but still:
a) There's a whole lotta gubbins in there as compared to a conventional motor. Wouldn't they add to the friction? And valve gear's not even shown; even a vertically-oriented single cylinder head on each side would, like BMW twins, require two drives and two cams or pairs, which is - our preferences aside - neither particularly elegant nor efficient.
b) Yes slipper pistons have less friction...but isn't the state of the art, at least in current Japanese bikes, that pistons are almost disk-like anyway? What's different here?
c) The little extra arms connected to the conrods are pivoted at the non-conrod ends, and would allow the pistons to rock in the bores as they move. Doesn't seem like a recipe for maintaining the geometry required by slipper pistons.
a) There's a whole lotta gubbins in there as compared to a conventional motor. Wouldn't they add to the friction? And valve gear's not even shown; even a vertically-oriented single cylinder head on each side would, like BMW twins, require two drives and two cams or pairs, which is - our preferences aside - neither particularly elegant nor efficient.
b) Yes slipper pistons have less friction...but isn't the state of the art, at least in current Japanese bikes, that pistons are almost disk-like anyway? What's different here?
c) The little extra arms connected to the conrods are pivoted at the non-conrod ends, and would allow the pistons to rock in the bores as they move. Doesn't seem like a recipe for maintaining the geometry required by slipper pistons.
26667
the Wizard of Oz
Oh. ...I thought the animation picture ended at the inlet and exhaust valves. ie. didn't show the pistons at all. One of each on each side.
No?
Still interesting to me as I continue my little quest for some understanding of how the internal combustion engine, particularly the BMW Type 247, works.
I'm barely past the point at which I keep saying, "Holy crap! Is that what engineers do? How in the hell does it get manufactured? Wait! All those moving bits have to work precisely in concert, don't they?!" and other exclamations like that. At the ripe old age of 58, I'm starting to see the fun involved in having a little grease under my nails.
No?
Still interesting to me as I continue my little quest for some understanding of how the internal combustion engine, particularly the BMW Type 247, works.
I'm barely past the point at which I keep saying, "Holy crap! Is that what engineers do? How in the hell does it get manufactured? Wait! All those moving bits have to work precisely in concert, don't they?!" and other exclamations like that. At the ripe old age of 58, I'm starting to see the fun involved in having a little grease under my nails.
I saw the pic here: http://www.brickleyengine.com/ and it shows the pistons, but not the valve gear.
Last edited:
108625
New member
Sure, he's reduced the number of crankshaft and connecting rod bearings, but they all just moved (and multiplied) to the heaviest, most Rube Goldbergesque reciprocating assembly I've ever seen.
Sure he left the valvetrain(s) out, he must be working on pushrod and rocker driven desmodromics for those minor details.
I'd say throw in an old Triumph twin plunger pump for the oil, but I have no idea how to circulate it to all of those pivot points.
Sure he left the valvetrain(s) out, he must be working on pushrod and rocker driven desmodromics for those minor details.
I'd say throw in an old Triumph twin plunger pump for the oil, but I have no idea how to circulate it to all of those pivot points.
