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I am rebuilding my NA8 engine and would like to know part number for the oil pump or do I just replace the warn parts?

Its extremely unlikely that the oil pump will be worm outside of specs.

Dann

Just FYI you can use the BP6D (NB8B/SE) pump in earlier 1800s and it has more capacity.

Are oil pumps in BP motors an issue?

I'm going over my BP before I drop it in (water pump, timing belt etc).

Motor is a 2nd hand motor of unknown history but 'appears' to be low mileage.

oil pumps are not a known issue. probably on the the better things mazda got right on these engines.

Oil pumps fail if you often spin it up to around 8,000rpm and beyond. Race built motors often have forged internals for the oil pump. Otherwise normally no issues with an original OEM pump

Thanks for all your input.

manga_blue wrote:Oil pumps fail if you often spin it up to around 8,000rpm and beyond. Race built motors often have forged internals for the oil pump. Otherwise normally no issues with an original OEM pump

The forged internals break too. This thread covers my approach to the fix
viewtopic.php?f=29&t=51179

Cheers
Woz

wozzah1975 wrote:

manga_blue wrote:Oil pumps fail if you often spin it up to around 8,000rpm and beyond. Race built motors often have forged internals for the oil pump. Otherwise normally no issues with an original OEM pump

The forged internals break too. This thread covers my approach to the fix
viewtopic.php?f=29&t=51179

Cheers
Woz

Very helpfull.

Are the NA6 & NA8 oil pumps interchangeable?

myredmx5 wrote:

wozzah1975 wrote:

manga_blue wrote:Oil pumps fail if you often spin it up to around 8,000rpm and beyond. Race built motors often have forged internals for the oil pump. Otherwise normally no issues with an original OEM pump

The forged internals break too. This thread covers my approach to the fix
viewtopic.php?f=29&t=51179

Cheers
Woz

Very helpfull.

Are the NA6 & NA8 oil pumps interchangeable?

I'm not sure! Someone else may be able to tell you that,

Cheers
Woz

Thanks Woz, I hadn't read all of the other thread until now but had always thought OEM pumps were good up to 8000. My car's redlined at 7600 and I take it all the way there routinely. All stock oil system. Now I'm wondering if I should I wind the limiter back a bit.

myredmx5 wrote:

wozzah1975 wrote:

manga_blue wrote:Oil pumps fail if you often spin it up to around 8,000rpm and beyond. Race built motors often have forged internals for the oil pump. Otherwise normally no issues with an original OEM pump

The forged internals break too. This thread covers my approach to the fix
viewtopic.php?f=29&t=51179

Cheers
Woz

Very helpfull.

Are the NA6 & NA8 oil pumps interchangeable?

not 100% on this, but there is a long nose and short nose pump. and the larger ones from the BPT familia GTR, not GTX found it's way into all BP from NA8/BA/KJ models onwards.

89-94 BG 323/Astina B6 BP
90-94 BG Familia BPT
94-98 BA/BHA 323/Astina Z5 B6 BP
90-94 KF/KH Laser/TX3 BP BPT
94-98 KJ Laser B6 BP
89-97 NA MX5 B6 BP
98-03 NB MX5 B6 BP BPT

Are the NA6 & NA8 oil pumps interchangeable?

depends on the year of manufacture, ie long nose versus short nose.