Timken Rollerized vs Sleeve Bearings
Thread Starter
Burning Brakes
Joined: Feb 2006
Posts: 1,024
Likes: 1
From: AL
Timken Rollerized vs Sleeve Bearings
FYI - Interesting:
http://engineeringtv.com/blogs/etv/a...d-engines.aspx
Just for information and discussion, i thought this fell more into tech than general.
i always wondered why the aftermarket/racing didn't attempt roller bearings, with cost nearly no object in that market. Now, it looks like it may be on the horizon for all vehicles; no doubt these days the extra cost could be offset by fuel savings.
http://engineeringtv.com/blogs/etv/a...d-engines.aspx
Just for information and discussion, i thought this fell more into tech than general.
i always wondered why the aftermarket/racing didn't attempt roller bearings, with cost nearly no object in that market. Now, it looks like it may be on the horizon for all vehicles; no doubt these days the extra cost could be offset by fuel savings.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Nearly all high end race motors are rollerized to some extent. Shaft rockers or roller rockers. roller lifters. roller bearing cam shafts are becoming more common. What you don't see very often except in the exotic car motors is roller cranks. You have to have pressed crank shaft journals. Which is easier with less cylinders, like one , two, four like in motorcycles.
Thread Starter
Burning Brakes
Joined: Feb 2006
Posts: 1,024
Likes: 1
From: AL
makes sense; however the man in the video says they are using a split roller bearing on the crank and rods. for a split second you can see one in his hand. will be interesting to follow . . .
Team Owner
Joined: Jul 1999
Posts: 65,492
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From: Orange Park Florida
that engine is full of roller bearings in everything...
Race Director
Joined: Feb 1999
Posts: 19,659
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From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
I have often thought of this kind of stuff and wondered when it was going to come about. I figured it had to be in the works. Next, I wonder how long the bearings will last compared to standard babbit bearings.
Racer
Joined: Mar 2007
Posts: 274
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From: Fairview TX
Motor cycles, racing karts and other small to medium engines have used them for a looong time - though these are not 'split'. Instead the cranks are pressed together so you can split the crank to service the bearings.
While I've had 1 catastrophic failure (those little pins running throught the engine ruin everything), I've not seen any other racers have similar failures.
All things being equal, I seriously doubt roller bearings will outlast sleeve bearings in a typical street engine.
I know of no roller bearing engines that typically make it to 20K miles (or equivalent number of hours). Roller bearings also require more surface area to handle the same loads.
While I've had 1 catastrophic failure (those little pins running throught the engine ruin everything), I've not seen any other racers have similar failures.
All things being equal, I seriously doubt roller bearings will outlast sleeve bearings in a typical street engine.
I know of no roller bearing engines that typically make it to 20K miles (or equivalent number of hours). Roller bearings also require more surface area to handle the same loads.
