Author Topic: extreme pistons (Read 6651 times)

turboguzzi · « **on:** January 21, 2013, 02:13:42 PM »

ok, its not sohc. its a 102mm boxer piston but look at that oil ring!

and its coming from wossner germany

754 · « **Reply #1 on:** January 21, 2013, 02:34:01 PM »

Them are big slugs...
I think that blown single here in town is around 107 mm.. 4.25 bore.

Old Scrambler · « **Reply #2 on:** January 21, 2013, 04:12:51 PM »

That's about the same size as our 1925 Allis-Chalmers 15-25 Model L......before it got bored another 1/4-inch for a rebuild. Quite a bit larger than my Triumph Cub. Pretty exotic piston and ring in the Beemer

mec · « **Reply #3 on:** January 22, 2013, 02:19:52 AM »

interesting design.

not bad either:

Jim F · « **Reply #4 on:** January 22, 2013, 04:59:55 AM »

Mec is that an F1 piston?
thats extreme also

Jim

bwaller · « **Reply #5 on:** January 22, 2013, 07:13:04 AM »

It's a wonder the thing stays straight in the bore. Cool looking indeed.

simon#42 · « **Reply #6 on:** January 22, 2013, 09:32:27 AM »

the bm piston has such a low crown hight so that the cylinders can be shortened , the classic racers love them as it gives quite a lot more ground clearance .
tg i am still looking for that supermono for you .

turboguzzi · « **Reply #7 on:** January 22, 2013, 11:53:23 AM »

yep mec, thats even more extreme! rod looks too long and slender for F1... with such small skirt looks like a drag motor.

thanks simon, but unless something comes up at the last moment, february 2nd i i will go with a sort of "kit bike" solution...

mec · « **Reply #8 on:** January 22, 2013, 02:30:36 PM »

the piston posted above seems to be made from steel. running in a steel cylinder liner you can run very tight piston clearances, thats why they work although beeing that short.
from what i have read, the piston is in an experimental stage, maybe for a ducati?

here is another one. made from steel, claims to be lighter than our "old fashioned" slipper ones:

bwaller · « **Reply #9 on:** January 22, 2013, 04:56:09 PM »

Hah, unreal.

lordmoonpie · « **Reply #10 on:** January 23, 2013, 02:30:51 AM »

Wish I'd kept pictures of the 105 bore piston from Dave Morris's Chrysalis BMW TT racer - they were awesome things. By happy coincidence I'm waiting for the postman today to deliver my new 100 bore pistons for the supermono project (you have to buy them in pairs!). They should be interesting...!

lordmoonpie · « **Reply #11 on:** January 23, 2013, 08:30:30 AM »

And the postman did arrive bearing lovely gifts...100 bore CP Pistons for a Ducati 999 with modified pin position...

turboguzzi · « **Reply #12 on:** January 23, 2013, 10:26:34 AM »

let me guess: building a supermono out of half a 999?

seen once 999 head on a husky mono....

MRieck · « **Reply #13 on:** January 23, 2013, 10:54:02 AM »

Quote from: lordmoonpie on January 23, 2013, 08:30:30 AM

And the postman did arrive bearing lovely gifts...100 bore CP Pistons for a Ducati 999 with modified pin position...

A proper piston there Simon.

turboguzzi · « **Reply #14 on:** January 23, 2013, 12:31:17 PM »

mike, any idea whats the story behind this CP thing ? did carillo buy a complete piston setup and became a manufacturer or is it just re-branded high end slugs?

mec · « **Reply #15 on:** January 24, 2013, 01:43:27 AM »

a few years ago carillo has been bought by the austrian company pankl.com . they are well known as a supplier in F1 and other high tech regios.
no wonder carillo/pankl sells it all.

mec

MRieck · « **Reply #16 on:** January 24, 2013, 05:06:55 AM »

Quote from: mec on January 24, 2013, 01:43:27 AM

a few years ago carillo has been bought by the austrian company pankl.com . they are well known as a supplier in F1 and other high tech regios.
no wonder carillo/pankl sells it all.

mec

Correct Mec. Carrillo was previously owned by the Dover Group

lordmoonpie · « **Reply #17 on:** January 24, 2013, 05:12:59 AM »

Quote from: turboguzzi on January 23, 2013, 10:26:34 AM

let me guess: building a supermono out of half a 999?

seen once 999 head on a husky mono....

Exactly right TG except I'm not going to reproduce the original doppia billietta of the original 'mono, just lighten the crank enough that it can be balanced for a single pot. The crank arrived from the USA with the pistons yesterday. Amazingly beautiful work by Ben Fox of Fox Performance. Some talented engine tuners in the USA that's for sure ;-)

I do have some 102 bore supermono pistons on my "shelf of wonders" somewhere, must dig them out and photograph them

754 · « **Reply #18 on:** January 24, 2013, 07:01:39 AM »

Lordmoonpie, how many hours do you get out of pistons like that ?

simon#42 · « **Reply #19 on:** January 24, 2013, 01:47:42 PM »

Quote from: mec on January 24, 2013, 01:43:27 AM

a few years ago carillo has been bought by the austrian company pankl.com . they are well known as a supplier in F1 and other high tech regios.
no wonder carillo/pankl sells it all.

mec

pankl are the finest piston / rod etc manufacturer in the world but they are certainly not cheap , have just bought some aprilia gudgeon pins from them at £550 each which hurt a bit .

Sam Green Racing · « **Reply #20 on:** January 24, 2013, 02:11:46 PM »

Were they solid GOLD ? how can any pin cost that much ?

Sam.

MRieck · « **Reply #21 on:** January 24, 2013, 07:02:08 PM »

Quote from: simon#42 on January 24, 2013, 01:47:42 PM

Quote from: mec on January 24, 2013, 01:43:27 AM
a few years ago carillo has been bought by the austrian company pankl.com . they are well known as a supplier in F1 and other high tech regios.
no wonder carillo/pankl sells it all.

mec

pankl are the finest piston / rod etc manufacturer in the world but they are certainly not cheap , have just bought some aprilia gudgeon pins from them at £550 each which hurt a bit .

Pankl makes F1 stuff....JE, Wiseco and CP do not. Mahle do if memory serves correct. Pins cost a lot....talk to Kelly Roberts.

mec · « **Reply #22 on:** January 25, 2013, 02:32:29 AM »

Quote from: Sam Green Racing on January 24, 2013, 02:11:46 PM

Were they solid GOLD ? how can any pin cost that much ?

Sam.

from solid gold much easier to fabricate than ultraleightweight highstress pins.

i remember the pictures i have seen, 20 years ago, conrods made of carbon fibre, transmission axles from carbon fibre tubes (between the front and rear differentials for the early audi quattro), all made by Pankl! they havnt been a success however.

mec

lordmoonpie · « **Reply #23 on:** January 25, 2013, 04:21:12 AM »

Quote from: 754 on January 24, 2013, 07:01:39 AM

Lordmoonpie, how many hours do you get out of pistons like that ?

These are fairly standard at the end of the day 754 - thousands of miles and hours as it'll be a street bike...

lordmoonpie · « **Reply #24 on:** January 25, 2013, 04:22:56 AM »

Quote from: simon#42 on January 24, 2013, 01:47:42 PM

pankl are the finest piston / rod etc manufacturer in the world but they are certainly not cheap , have just bought some aprilia gudgeon pins from them at £550 each which hurt a bit .

Just got two rod bolts for the Pankl rod that'll connect to my piston above Simon - £126 per bolt!

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Author Topic: extreme pistons (Read 6651 times)