Husaberg
Go Back   Husaberg Forum > Mechanical and Technical > Mechanical

Mechanical Mechanical Forum - spinning bits and gyrating bobs


Thanks Tree4Thanks
Reply
 
LinkBack Thread Tools Display Modes
May 12th, 2005, 07:45 AM   #21
Senior Member
 
LINEAWEAVER's Avatar
 
Joined: Jul 2001
From: El Sobrante, Ca. 94803

Posts: 3,249
Thanks: 1

I Ride:
Hi Schultzy,
Prolonged high rpm operation will spew oil from the Husaberg crankcase as a result of having a small crankcase capacity and minimal breather baffling.

Installing a check valve reduces pulsing consequently reducing oil spewing.

Oil spewing is considered normal for Husaberg, however, it need not be with a simple revision.

Kind Regards,
Dale
LINEAWEAVER is offline  
 
May 14th, 2005, 10:29 PM   #22
Senior Member
 
rancheroracer's Avatar
 
Joined: Apr 2005
From: Rodeo, California

Posts: 134
Thanks: 0

I Ride:
Originally Posted by LINEAWEAVER
Hi Schultzy,
Prolonged high rpm operation will spew oil from the Husaberg crankcase as a result of having a small crankcase capacity and minimal breather baffling.

Installing a check valve reduces pulsing consequently reducing oil spewing.

Oil spewing is considered normal for Husaberg, however, it need not be with a simple revision.

Kind Regards,
Dale
Dale,
Pardon my ignorance of Husabergs since this is my first one. By installing one of the valves & creating some vacuum in crankcase, that doesn't interfere with trans oiling? Is everything under the same vacuum, crankcase & gears?
Thanks,
Doug
rancheroracer is offline  
May 14th, 2005, 11:24 PM   #23
Moderator
 
berger's Avatar
 
Joined: Apr 2002
From: Phoenix Arizona

Posts: 3,145
Thanks: 9

I Ride: the pine
Hi Doug,
I think for the most part it is safe to trust Dale's recommendations without question. This is not his first rodeo.
The answer to your question is no, the breather mod will not adversly affect transmission lubrication.
berger is offline  
May 15th, 2005, 06:23 AM   #24
Senior Member
 
LINEAWEAVER's Avatar
 
Joined: Jul 2001
From: El Sobrante, Ca. 94803

Posts: 3,249
Thanks: 1

I Ride:
Hi Rancheroracer,
Crankshaft cavity scavenging operates via pressure differential between the main crankcase and said cavity. By installing a check valve in the engine vent line a vacuum is created in the entire engine assembly, however, the pressure differential between the crankshaft cavity and main crankcase remains the same.

Hope this helps.

Sincerely,
Dale
Thanks from jonwilli
LINEAWEAVER is offline  
July 6th, 2005, 12:24 AM   #25
Senior Member
 
Joined: Oct 2003
From: Norway

Posts: 252
Thanks: 1

I Ride:
I was thinking of just fitting afilter to the pipe. Oil fumes do indeed lower the octane of the fuel. Would this be better, or is the suction of the crancase needed?
Vegard is offline  
July 8th, 2005, 09:28 AM   #26
Senior Member
 
Smorgasbord's Avatar
 
Joined: Jun 2005
From: Kings Farth

Posts: 449
Thanks: 1

I Ride:
Vegard, I've seen a few installations like husabutt did but without a check valve. No extra vacuum and it still works. Since the engine is already fitted with a reed valve internally the crankcase will still produce its own "vacuum".
However suppose that you are crossing a ditch with deep cold water that quickly cool your hot engine and the gasses in the cavity inside it. What happens? I think that there is a risk that you get suction inside the engine which sucks in ditch water via the breather tube whose open end is submerged in the muddy ditch water. Not good for your engine if it actually managed to inhale the water. With the exhaust pulse air injection valve that husabutt fitted in the breather line he'll positively prevent that to happen.

I wonder what would happen if you connected the exhaust pulse air injection valve to the exhaust manifold, would it produce real vacuum in the engine?

Hopefully the "vacuum" in the frame tube is very moderate with a clean air filter after all so if you just fitted a breather filter splash proof and well above the water line I would guess you'd be all right. It has the advantage of simplicity. I'm running an installation much like husabutts but the valve is at the open end and I've never seen water in the oil even after deep crossings where the open end was submerged deep in the wet.
101...
Smorgasbord is offline  
July 8th, 2005, 02:18 PM   #27
Senior Member
 
Joined: Oct 2003
From: Norway

Posts: 252
Thanks: 1

I Ride:
I use my bike 98% for supermote, the last 2% MX... So.. No water...
Vegard is offline  
July 8th, 2005, 03:14 PM   #28
Senior Member
 
Joined: Mar 2005
From: Mesa, AZ

Posts: 2,713
Thanks: 3

I Ride:
Check my gallery to see Bobzilla's awesome job on my-now bike.
LeFrog is offline  
July 8th, 2005, 09:19 PM   #29
Senior Member
 
LINEAWEAVER's Avatar
 
Joined: Jul 2001
From: El Sobrante, Ca. 94803

Posts: 3,249
Thanks: 1

I Ride:
Originally Posted by Smorgasbord
I wonder what would happen if you connected the exhaust pulse air injection valve to the exhaust manifold, would it produce real vacuum in the engine?
It does indeed and I speak from experience as I have been doing such for some two decades.

Kind Regards,
Dale
LINEAWEAVER is offline  
July 9th, 2005, 09:16 AM   #30
Senior Member
 
Smorgasbord's Avatar
 
Joined: Jun 2005
From: Kings Farth

Posts: 449
Thanks: 1

I Ride:
So, LINEAWEAVER, it is hard to tell wether your competitors eyes are tearing from the fact that you got ahead of them with your vacuum perked up engine or wether it is because of the oily smoke coming from your exhaust?
Smorgasbord is offline  
Reply

  Husaberg Forum > Mechanical and Technical > Mechanical

Tags
101, crankcase, venting



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Opinions on 501 crankcase venting mod ajw30 Mechanical 7 April 24th, 2011 02:56 PM
470 crankcase johnsmith Mechanical 10 November 28th, 2007 11:38 AM
once more STUPID venting issue Bobzilla Mechanical 19 June 17th, 2007 03:25 AM
Oil Venting Through the Air Filter baja_racer Mechanical 3 February 28th, 2006 12:50 AM
Crank Case Venting Rideguy Husaberg 12 December 3rd, 2004 02:19 PM


Facebook Twitter Google+ RSS Feed