Ball bearing cores
06-01-06, 01:56 PM
#1
GT4088R
Thread Starter
Join Date: Jan 2006
Location: UK
Posts: 467
Likes: 0
Received 0 Likes
on
0 Posts
Ball bearing cores
Done a bit of reading on the net and I noticed you can get 2 types of cores.
Ball bearing and dual ball bearing cores. Whats the difference??
Has anyone got any links to the design of the BB cores as I'm intrested in the design and might consider making one as I have a load of spare time soon, If it doesn't work out well it was worth it. Me and a mate work in engineering so machining isn't a problem. End of the day we might not be able to but its worth a thought. So dont shoot me down with saying it cant be done cos someone out there is making them.
Ball bearing and dual ball bearing cores. Whats the difference??
Has anyone got any links to the design of the BB cores as I'm intrested in the design and might consider making one as I have a load of spare time soon, If it doesn't work out well it was worth it. Me and a mate work in engineering so machining isn't a problem. End of the day we might not be able to but its worth a thought. So dont shoot me down with saying it cant be done cos someone out there is making them.
Last edited by BuckyFD3; 06-01-06 at 01:58 PM.
06-01-06, 02:31 PM
#2
Turbo ball bearings:
IHI and Garrett both use steel double ball bearing designs. Turbonetics and Innovative (ITS) both use a ceramic ball bearing, but Turbonetics is a single ball bearing while the Innovative is double. Turbonetics uses a larger ball bearing on the compressor side for axial and thrust loads while using standard sleeve oil bearing in the rear. The previous three manufactures mentioned using double ball bearings use them on both sides of the shaft.
Now, with that being said, its a whole lot more complicated then it sounds. First is finding bearings that can survive the loads, RPMs, and temperatures. After you found something suitable heres the difficult part. Simply mounting ball bearings into a center section and sliping the turbine shaft through it will detroy itself in short time. The actual ball bearings are built into a sleeve/oil film bearing like standard turbo bearing. the reason for this is harmonics. You have the shaft which spins, which inturn spin in the ball bearings, which inturn spin in a standard bushing/oil bearing. This oil bearing surrounding the ball bearing dampens out harmonics which would lead to bearing failure. Another tricky part is keeping all this lubed up and not having oil dump into either the compressor or turbine. These seal areas are dynamically sealed. The comp side using centrifugal force, and the turbine side using some centrifugal force and a piston type seal. They both also use the pressure thats in the turbine and comp housing (this is why sometimes at high RPM when you let off the gas you see smoke. It could be from the turbine side or compressor side seeing less pressure in their housings, yet the engine rpms are still high and so is oil pressure so some oild will seep into the comp housing or turbine housing). Using rubber or carbon type seals that ride the shaft would cause drag and negate the use of ball bearings and also wear on the shaft.
With all this said, GOOD LUCK BUILDING ONE.
~Mike.................
IHI and Garrett both use steel double ball bearing designs. Turbonetics and Innovative (ITS) both use a ceramic ball bearing, but Turbonetics is a single ball bearing while the Innovative is double. Turbonetics uses a larger ball bearing on the compressor side for axial and thrust loads while using standard sleeve oil bearing in the rear. The previous three manufactures mentioned using double ball bearings use them on both sides of the shaft.
Now, with that being said, its a whole lot more complicated then it sounds. First is finding bearings that can survive the loads, RPMs, and temperatures. After you found something suitable heres the difficult part. Simply mounting ball bearings into a center section and sliping the turbine shaft through it will detroy itself in short time. The actual ball bearings are built into a sleeve/oil film bearing like standard turbo bearing. the reason for this is harmonics. You have the shaft which spins, which inturn spin in the ball bearings, which inturn spin in a standard bushing/oil bearing. This oil bearing surrounding the ball bearing dampens out harmonics which would lead to bearing failure. Another tricky part is keeping all this lubed up and not having oil dump into either the compressor or turbine. These seal areas are dynamically sealed. The comp side using centrifugal force, and the turbine side using some centrifugal force and a piston type seal. They both also use the pressure thats in the turbine and comp housing (this is why sometimes at high RPM when you let off the gas you see smoke. It could be from the turbine side or compressor side seeing less pressure in their housings, yet the engine rpms are still high and so is oil pressure so some oild will seep into the comp housing or turbine housing). Using rubber or carbon type seals that ride the shaft would cause drag and negate the use of ball bearings and also wear on the shaft.
With all this said, GOOD LUCK BUILDING ONE.
~Mike.................
Last edited by RacerXtreme7; 06-01-06 at 02:36 PM.
06-01-06, 05:19 PM
#5
Rotary Enthusiast
BB turbo
I had an Innovative apart and the actual housing was a diifferent casting than a standard T-4 sleeve bearing housing, quite a bit larger in the center so as to carry the larger double bearing cartridge, also a call to them said they could not sell me just the bearings alone, had to buy the whole CHRA. RON
06-03-06, 07:12 AM
#7
GT4088R
Thread Starter
Join Date: Jan 2006
Location: UK
Posts: 467
Likes: 0
Received 0 Likes
on
0 Posts
I was talking to a guy who is looking to do this and he has found a suplier of the bearings. I am a good friend so getting the info wont be hard. He did say the bearings wern't cheap 
Trending Topics
06-05-06, 10:10 AM
#8
One more thing that needs mentioning. All ball bearing turbos go through an extremely accurate VSR balancing. Most standard built turbo's T4 and up just get the wheels balanced individually then get assembled (some higher end turbo shops will VSR balance next, but most off the shelf turbo's dont go through it). Were VSR balancing takes the already balanced individual wheels, assembles them, then statically AND dynamically balances them as an assembled unit. Without this precision balancing ball bearing turbos do not last long at all. You can get any turbo VSR balanced (its a precision machine thats computer controlled) done by any repuable turbo shop.
~Mike..............
~Mike..............
Thread
Thread Starter
Forum
Replies
Last Post
Turblown
Vendor Classifieds
12
10-17-20 03:25 PM
ls1swap
3rd Generation Specific (1993-2002)
12
10-01-15 07:58 PM
