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Main Bearing support plate differences.

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Old Jun 25, 2010 | 01:52 PM
  #1  
bbundy's Avatar
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From: Anacortes, WA
Default Main Bearing support plate differences.

I Took apart a 95 Protégé motor.
I was surprised the MBSP could be connected to all 5 mains but just like the miata it doesn’t have the holes cast in the center cap so it wasn’t.

I wonder if the caps are machined close enough that you could use a cap from a different block to connect all 5 mains. I have no idea what that would improve but I thought it interesting.

Miataroadster is selling a modified one to connect to all 5 mains. But you have to use billet caps and line bore the block. It would be a fortune to do.

Bob
Attached Thumbnails Main Bearing support plate differences.-p1010032.jpg  
Old Mar 27, 2023 | 11:13 PM
  #2  
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Originally Posted by bbundy
I Took apart a 95 Protégé motor.
I was surprised the MBSP could be connected to all 5 mains but just like the miata it doesn’t have the holes cast in the center cap so it wasn’t.

I wonder if the caps are machined close enough that you could use a cap from a different block to connect all 5 mains. I have no idea what that would improve but I thought it interesting.

Miataroadster is selling a modified one to connect to all 5 mains. But you have to use billet caps and line bore the block. It would be a fortune to do.

Bob
bringing this back from the dead. I’m trying to find one from a protege and hack up to adapt to my Miata’s. Not paying for the MR one.
Old Mar 29, 2023 | 10:25 AM
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You are still going to have the issue of the main caps missing the threaded bosses for the plate to mount to.
Old Jul 12, 2023 | 02:50 AM
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hi guys, do you know what model protege this came from? by any chance?
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