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Author Topic: BMW conversion bearings  (Read 3455 times)
leec
Hero Member
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Posts: 2599
« on: July 16, 2018, 22:35:25 pm »
Hi guys,
Quick question. I know people are using BMW bearings to run a type 4 journal crank in a standard line bore type 1 case.

Are these bearings available for a type 4 mains crank that has had a grind to first undersized?

Lee
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dragvw2180
Sr. Member
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Posts: 304
« Reply #1 on: July 17, 2018, 00:34:59 am »
 They do not make them for the O/D but do make them for the I/D of the bearings from what I have seen. Mike
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UltraOrange67-2443
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Posts: 1034
« Reply #2 on: July 17, 2018, 09:10:21 am »
I got some spare ones in standard size from King Bearing.

I will check the part number and you could ask the supplier about it.

You also need to narrow the bearing.

Cheers, Nick
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1967 1200 2920cc EFI
leec
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Posts: 2599
« Reply #3 on: July 17, 2018, 09:33:17 am »
Quote from: dragvw2180 on July 17, 2018, 00:34:59 am
They do not make them for the O/D but do make them for the I/D of the bearings from what I have seen. Mike

Thanks
Inside diameter would be crank size?
Lee
« Last Edit: July 17, 2018, 09:39:04 am by leec » Logged
Tufty65
Full Member
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Posts: 118
« Reply #4 on: July 17, 2018, 22:38:56 pm »
Loads on eBay, bmw m30 bearings, from .25mm oversize bearing up to .75mm (for .25mm to .75mm undersized crank)
Need to narrow them tho as said.
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Outlaw Flat Four 35
12.64 @ 106.25mph
UltraOrange67-2443
Hero Member
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Posts: 1034
« Reply #5 on: July 23, 2018, 15:07:22 pm »
Don't forget to add the notch for the Bearing tang!

That thrust Bearing are you using?
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1967 1200 2920cc EFI
leec
Hero Member
*****
Posts: 2599
« Reply #6 on: July 23, 2018, 17:36:35 pm »
I haven't got that far with this yet. I have bought the crank now and will wait for it to arrive and go from there

Thanks,
Lee
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bedjo78
Sr. Member
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Posts: 253
« Reply #7 on: July 24, 2018, 05:27:02 am »
How about Crysler bearings ? Are they have outer oversize main ?
« Last Edit: July 24, 2018, 06:53:50 am by bedjo78 » Logged
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