Yea/Nay?

 

imo the bearings shouldnt hold oil excessively. the best oiling modification imo is to the crank oiling holes to the bearings to allow oil to move to the bearing more freely. remember, oil is the heats path away from the bearing, keep it there too long, and you're hurting the bearing.

 

Use ball bearings, Dustin. End of problem.

Sonny

 

Dustin,

There is a whole science to lubrication and journal bearings (called tribology I think). I did a 6 month rotation thru that design group in 1974 so my knowledge is dated and not practiced daily.

What I remember is the art of lubricated journal bearings is to distribute an oil film across the bearing and yet allow a hydrodynamic wedge or film of oil to remain and keep the two surfaces separated. If you put groves in the wrong places (pressure or loaded side) I believe you actually reduce the load and shock carrying capacity of the bearing. The design guys were real careful where they put the feed holes and groves if I remember correctly. And they never brought them near the edge of the bearing, as it was like a groove in a tire, it helped the oil escape the bearing and destroyed the hydrodynamic wedge. Saw some pretty cool polarized high speed video of bearings starting, rolling the oil up and the shaft lifting off the bearing at speed. Also of shock loads destroying the film and allowing metal to metal contact. Another neat area where you could spend a lifetime studying a simple shaft and journal bearing.

By the way my lab (well the one I work at days) has developed an oil free turbo machinery bearing. It has been licensed to a turbo manufacturer. It consists of some high temperature coatings and a contactless bearing. You should start seeing it in production in a few years. Truely amazing 100K+ rpms, high temps, long life and no oil! T'aint science wonderful? Won't need any more oil or coolant lines.

Regards,
BigMoose


[Modified by BigMoose, 10:06 PM 10/22/2002]

 

Moose, can you send me a sample of the bearing...hehe

 

bad ***!

hmm...now the question arises...should i wait for my turbo? nahh!!!





[Modified by TheSwift1, 3:13 AM 10/23/2002]

 

just out of curiosity, arent you still interested in removing heat from the bearing/shaft area? is the coeffecient of friction so low that the shaft/bearings themselves generate negligible heat? in a turbo application i would think you'd still need cooling around the shaft housing thanks to the impressive heat on the turbine side causing everything to expand. are tolerances loose enough such that this is not an issue? or do all the CTE's of each of the components match?

at my real job we were having issues with chips with different coeffecients of thermal expansion popping off our circuit boards, since the circuit board itself can only have one CTE

 

so should u make the hole in the crank bearing any bigger. keep it somewhat simple im still in college u know..

 

Man did the addition on oil free bearings generate a lot of interest. I'm pretty sure I have seen pictures of these oil free bearings running red hot. They are truely amazing. I am not ducking the details, I see a lot of stuff and it is sometimes hard to keep it straight if I am not working on it. Lets see if I can find some reference for you guys.

here are some urls on the oil free bearing and its technology:
http://www.grc.nasa.gov/WWW/SurfSci/della.html

The PS304 coating is amazing....I remembered right 1200 degrees F
http://www.grc.nasa.gov/WWW/Oilfree/coatings.htm

Key Technologies:
http://www.grc.nasa.gov/WWW/Oilfree/technology.htm

Maybee that will wet your appetite. Earl if you have an application, this stuff is licensable or however that is spelled.

The first url gives you the team members and who the turbo manufacturer is.

Regards,
BigMoose

Edit...'cause I wish I could spell better.


[Modified by BigMoose, 11:00 PM 10/22/2002]

 

Champhor the opening of the oil passage but do not make the hole diameter bigger.

 

I don't see what cold sore medicines have to do with lubrication ? LOL !!!

 

Hehe chamfered oil holes and polished crank. you can always polish the rods too...helps them shed oil. So if you're really really ****.....

What we do need are windage trays and crank scrapers. I bet that **** flies around like crazy in the high RPM Honda motors.

 

Nay, the proper oil film will not be sustained. Bearing failure

Oil-free bearings is something that I have not not looked into in quite awhile.....interesting. I will have to try to find all of the info I drummed up a few years back.


[Modified by SLPR, 6:20 AM 10/23/2002]

 

Now if/when these are released affordability will be key in sales to the general public.


[Modified by Dublocivic, 11:38 AM 10/23/2002]

 

mag-lev baby!