1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Cosmo Oil pump on a 12A

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Old Jun 23, 2021 | 08:54 AM
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From: nc
Cosmo Oil pump on a 12A

I need to know if a Cosmo or 13b turbo oil pump will work with a 12A front iron, or if a gsl-se oil pump flows the same.
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Old Jun 23, 2021 | 10:05 AM
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From: https://www2.mazda.com/en/100th/
the 85+ engines have a different bolt pattern, so they won't fit. depending on the year of the 12A the GSL-SE would have the same pump
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Old Jun 23, 2021 | 10:15 AM
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From: nc
Would you know off the top of your head if the se oil pump would have enough flow for a 12a based 3 rotor? I'm worried about starving it for oil. Not really looking to go dry sump. The build will be N/a and plan on running a higher pressure oil pressure regulator.
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Old Jun 23, 2021 | 10:56 AM
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From: SE PA
Originally Posted by j9fd3s
the 85+ engines have a different bolt pattern, so they won't fit. depending on the year of the 12A the GSL-SE would have the same pump
My '85 12a omp is 2-line and the -SE is 4-line, and they have a different bolt pattern (and take different block-off plates). I'll take pics when I get home this evening.
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Old Jun 23, 2021 | 11:16 AM
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From: nc
Originally Posted by Maxwedge
My '85 12a omp is 2-line and the -SE is 4-line, and they have a different bolt pattern (and take different block-off plates). I'll take pics when I get home this evening.
I'm not looking at the omp. Its the actual oil pump inside the front cover. The omp is the first thing to go in the trash on my cars.
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Old Jun 23, 2021 | 11:27 AM
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From: SE PA
Ah, my apologies, I misunderstood ya there.
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Old Jun 23, 2021 | 11:30 AM
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From: nc
Originally Posted by Maxwedge
Ah, my apologies, I misunderstood ya there.
No biggy. I'm working on a project that has very little info so there will be plenty of misunderstanding.
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