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August 18th, 2019, 01:54 PM   #781
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I have heard that if you go over seven percent of the design change then patent protection no longer applies. Don't know if it is true.
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August 18th, 2019, 10:08 PM   #782
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Originally Posted by Dr_C View Post
How large portion Husaberg must the engine contain, to be allowed to be called Husaberg?
Well, in computer science we have a rule: If it walks like a duck and it talks like a duck then it must be a duck.

In the videos yours seems to walk like a duck. And talk like a duck.
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August 18th, 2019, 10:27 PM   #783
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Originally Posted by Dr_C View Post
How large portion Husaberg must the engine contain, to be allowed to be called Husaberg?
Your engine has more Husaberg parts than the 70deg engine, and I consider those to be husabergs!

Btw, your engine is beautiful. Function rule over artistic.
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August 19th, 2019, 01:23 AM   #784
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Originally Posted by Dr_C View Post
Hallo Edgar!
There can be many explanations for getting an excessive amount of oil from the breather. Is it really that big an issue for you?
Connecting the breather to the airbox is not helping much. The lower air pressure in the air box helps sucking out the air/oil fume. A restrictive/dirty air filter can do that. A separate breather connected directly to the air (not air box), can reduce the oil loss.
If the foam in the breather has become soaked, it doesn't breathe very good, causing a higher velocity on the smaller air flow, which in turn carries the oil better.
Increasing the breather area is generally a good idea, as it lowers the air velocity.
You will need to avoid direct oil splashing on the orifice of the breather stub from inside the engine.
Higher rpms during longer periods, higher compression ratio and worn piston rings also increases blow-by, and carries more oil through the breather.
I have kept the breather connected to the valve cover, but added one through the hole where the starter motor used to be. I'm running 13,5:1, revving +6k all the time with a 680cc. No problem with oil from the breathers (the coffee perculator, according to Bushie).


I made the experience when you fail landing your Berg or you drop the bike on a steep hill, the hot oil instantly finds its way into the carb boot via the engine breather ... (example pic from internet attached). When that happened you can spend 1h for kickstart-pumping the oil through the carb...

The idea was providing the same flow area for the engine breather, but bypassing the airfilter. The air flow via the valve covers may could support cooling the outer right exhaust and inlet valve... I also like your idea with the very short filter attachment.

Regards,
EDE
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August 19th, 2019, 12:20 PM   #785
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Ready for a trackday tomorrow!

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August 21st, 2019, 08:33 PM   #786
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The short summary is that the engine pulls strong throughout the whole range (changed intake cam LC from 108 to 102,5 deg)! All large/critical mechanical parts behaived. Two small leakages were found. The new impeller cover works just fine! Video will come!

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Last edited by Dr_C; August 22nd, 2019 at 09:20 AM.
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August 22nd, 2019, 02:56 PM   #787
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Hey you wouldn't have one extra, would you? Like for me?
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September 1st, 2019, 06:27 AM   #788
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And video, as promised:

http://youtu.be/ZdzTxoF4lZQ
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September 3rd, 2019, 08:15 PM   #789
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Impeller cover update!
My machinist has been building a pool back home, so have been having difficulties setting his priorities straight!
The covers are sent for anodizing. The plan is to mill batch #2 this week. We are now talking about a total of 30 covers!

My own cover has been pressure tested in the work shop and successfully field tested on a trackday. My transmission cover had a dent/damage in the sealing surface against the impeller cover, so I had to shave off 0,3mm in a mill to make the o-ring work.

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September 4th, 2019, 09:43 AM   #790
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Wow dr.C...that engine looks really nice!! If it worked id offer you some money to make a coffee table in my living room!

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