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Old 11-20-2012, 06:55 AM   #16
RGregor
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Quote:
Originally Posted by chasbmw View Post
I assume that the orange lines on the gaskets are a compound that help to seal the gaskets?

Charles
Some kind of silicone
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Old 11-20-2012, 06:58 AM   #17
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Originally Posted by Airhead Wrangler View Post
That tiny ring is now VERY close to the holes for the cylinder studs. Not a problem, I guess though.
Yours? What's the environment you run it in?
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Old 11-20-2012, 07:00 AM   #18
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Quote:
Originally Posted by RGregor View Post
Yours? What's the environment you run it in?
No, not mine, just a random photo I found on the internet. I'd never paint Siebenrock cylinders. Especially, not running it here in Mexico in 40+ degrees.
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Old 11-20-2012, 07:00 AM   #19
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100mm bore (racing only):





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Old 11-20-2012, 07:12 AM   #20
Airhead Wrangler
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Originally Posted by AliBaba View Post
100mm bore (racing only):
That'd make for 1109cc. Hot mama.
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Old 11-20-2012, 07:58 AM   #21
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Originally Posted by Airhead Wrangler View Post
That'd make for 1109cc. Hot mama.
With a long-stroke crank you can even get 1160cc.
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Old 11-20-2012, 10:02 AM   #22
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Originally Posted by Airhead Wrangler View Post
That'd make for 1109cc. Hot mama.
A friend has an engine with 102mm bore.


Full story (in german) here.
http://www.boxerkunst.de/content.php...r-Alpenbrenner
Pistons were from Werner Fallert, cylinders are custom made.
No long term experience yet.
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Old 11-20-2012, 01:26 PM   #23
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Quote:
Originally Posted by Airhead Wrangler View Post
No, not mine, just a random photo I found on the internet. I'd never paint Siebenrock cylinders. Especially, not running it here in Mexico in 40+ degrees.

That goes for polishing various outer parts as well; some may think it looks good, but it makes the engine run much hotter.
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Old 11-20-2012, 02:03 PM   #24
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Quote:
Originally Posted by RGregor View Post
A friend has an engine with 102mm bore.


Full story (in german) here.
http://www.boxerkunst.de/content.php...r-Alpenbrenner
Pistons were from Werner Fallert, cylinders are custom made.
No long term experience yet.
Not much room between the bore and the studs.
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Old 11-21-2012, 05:40 AM   #25
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Originally Posted by supershaft View Post
I wonder if the cylinders 'walk ' more with no skirts?
The 98mm Siebenrock cylinders have a very short and thin (1mm) skirt.
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Old 11-21-2012, 05:41 AM   #26
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Originally Posted by pommie john View Post
Not much room between the bore and the studs.
Close to none. I'm wondering if they last ...
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Old 11-21-2012, 09:05 AM   #27
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Originally Posted by RGregor View Post
Close to none. I'm wondering if they last ...
Yes, they do last... for 10 hours. For race motors only.
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Old 11-21-2012, 09:43 AM   #28
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Originally Posted by craydds View Post
Yes, they do last... for 10 hours. For race motors only.
It's not a racer but a normal street bike.
And it's intended to last.
I'll report, if it doesn't.
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Old 11-21-2012, 09:49 AM   #29
craydds
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Originally Posted by RGregor View Post
It's not a racer but a normal street bike.
And it's intended to last.
I'll report, if it doesn't.
Sign me up for a set.
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Old 11-21-2012, 09:57 AM   #30
Airhead Wrangler
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I've never seen an open oil ring like that. It seems like you'd get some accelerated wear where the oil ring enters the grooves on both sides of the wrist pin. Is he using a normal 70.6mm stroke? Longer rods or shorter barrels?
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