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April 30th, 2007, 07:15 PM   #1
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OIL IN CRANKSHAFT AREA

Does anyone know how much oil ,either quantity or height is present in the crankshaft cavity at maximum rpm on a 550 engine.As well is there a spec for how much oil in cc's per minute is fed to the main bearings at max rpm. ... thx
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May 2nd, 2007, 03:33 AM   #2
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RE: OIL IN CRANKSHAFT AREA

No one seems to know the answer and I have not been able to find it as well.
After some reseach/reading i.e. wading through the SKF and NTN bearing maintenance guides I have gathered some info.
The NJ62 series bearings have a rpm maximun of 11000 rpm but only if they are in an oil bath mounted in the horizontal position.When in the vertical position the maximum for this bearing is less 20% or 8800 rpm but only if the bearing is at least 30% submersed in oil.
With the increased loading of the axial counterbalancer and using maximum RPM for any extended time period there is a possibility that this bearing is being overextended.
It is noted in the guides that bearing life is extended with the use of what is referred to as diester oil.
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May 2nd, 2007, 03:42 AM   #3
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I am interested to see where this line of 'questioning' ends up...

Cheers

Mark
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May 2nd, 2007, 03:45 AM   #4
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Re: RE: OIL IN CRANKSHAFT AREA

Hi nsman, this is only a guess but I would think the only oil to the bearings is what is being fed by the pump regarding the quantity in this area I would think it will be only small as the downward stroke of the piston will clear the sump via the reed valve, but like I said this is only a guess.

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Sparks.
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May 2nd, 2007, 04:40 AM   #5
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RE: Re: RE: OIL IN CRANKSHAFT AREA

I think that what this info is telling us is that there is a design limitation to these rollers.They have made a slight trade off in peak RPM for increased load ratings.It explaines a lot,but really nothing we did not all ready know.If you run a berg engine to its maximum RPM with respect to its cylinder head beathing ability you can damage the engine.This may explain why certain tuners prefer to use balls and no balancer.It also may explain why for the most part enduro riders have little problem in this area and others who live in more open areas where high speed running is possible have issues.
If you ride in the Australian country where you can see for miles and like to go fast the chances are good,if you ride in the eastern part of NA where you never see more than a few hundred yards ahead and engine speeds are in the midrange chances are poor.
The counter balancer can be a benifit when the engine is used as a true enduro mount as in the euro sport and it can be a detriment idf the engine is used for use in the exreme end of this engines RPM ceiling.
If you run supermoto and like to gear it tight you may be wise to use a rev limiter.Fact is it may be a good idea for anyone who wants to explore the extreme end of the rpm ceiling.
Good fuel,proper gearing for the riding conditions and not overreving the engine will pay benifits in main bearing life.
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May 2nd, 2007, 04:43 AM   #6
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RE: Re: RE: OIL IN CRANKSHAFT AREA

before anyone gets there...yes ceramics may be the answer...someday.
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May 2nd, 2007, 03:38 PM   #7
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Re: RE: OIL IN CRANKSHAFT AREA

Originally Posted by nsman
It is noted in the guides that bearing life is extended with the use of what is referred to as diester oil.
Yes I have been advised by 2 seperate euro Rallye teams that a double ester 100% synethic oil like Motul 300V 15w50 is THE way to get long life out of the Berg main bearings.
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May 3rd, 2007, 01:27 AM   #8
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Re: RE: OIL IN CRANKSHAFT AREA

Gazza, this is what I've being trying to preach but there you go I've always used Silkerlene Pro4 15/50 used it mainly on road race engines never had one failure this oil is designed for this kind of enviroment.

Sparks.
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May 3rd, 2007, 02:28 PM   #9
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just thought i,d do a bit of reseach while the motor is appart.go to weeds gallery to check out crankcase oil volume etc, by the way main crank bearings are splash feed.it would be possible to increase the crank oil level if the overflow rib was built up.

regards weed
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May 3rd, 2007, 05:21 PM   #10
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Hi weed,
I dont think increasing the oil level is a viable opiion.A design featue of these engines is that the oil below the spinning crank is expelled out of the reed valve assy.This has the effect of less drag on the rotating crank assy,with no oil bath to cause drag.
When you think about it the Berg engine is similiar to a 2-stroke bottom end.This design takes the best from both worlds so to speak,ingenius really!
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