TheV's

iTrader: (2)

Looking for some wise council on Oil pumps for my build. It's a 94 1.8 with a vvt head and a 2554 turbo, targeting about 230-240 HP. Budget is tight and don't think I can stretch to a new boundary pump, so I took to looking at the mazda motorsports stock parts site and found 10 different pumps, all with different part numbers and associated cost - some are more than double others....So the question is for my Frankenstein motor, since the VVT is oil driven, should I be looking for a particular pump ? Secondly, why the heck have Mazda so many different variants and is there any significant difference between them ? Some are priced around $95 and some at $200, but it's not clear why spending double would be worthwhile ??

Here's the list of parts I found
1994 pumps
B661-14-100
B6BF-14-100A
B6S8-14-100E
B6S8-14-100F
RF01-14-100A

1999 Pumps
BP4W-14-100 -$95ish
BP5A-14-100
BP6D-14-100
ZL01-14-100 - $95ish

2002 pump
BP6D-14-100 - $200ish

Thanks in advance

Amellrotts

iTrader: (2)

IT is my understanding that the VVT oil pumps flow more volume to accommodate the VVT solenoid. If this were my motor I would want the oil pump for a VVT engine.

TheV's

iTrader: (2)

That was my understanding also, but has anybody ever seen any data or taken them apart and figured out the physical differences ?

MartinezA92

iTrader: (4)

First, on a turbo engine I would make sacrifices elsewhere. I would get the BE pump.

However, if you absolutely cannot afford it, I would get the correct VVT pump, if Amellrotts is right. It would be worthwhile, and probably necessary.

thenuge26

iTrader: (2)

I would rather skimp on things that aren't in the engine. Get a BE pump and a chinacharger (or T25), as it will be easier to upgrade the chinacharger when the budget allows it than it will be to upgrade the oil pump (or purchase a new engine because the OEM replacement failed).

Savington

iTrader: (31)

The gears in the VVT pumps are ~.020" wider.

EO2K

iTrader: (37)

What does backwards compatibility look like? Any reason why the VVT pump could not be retrofitted into an earlier NA BP or BP4W?

fooger03

iTrader: (2)

OP, you want the 2002 pump.

First off, you cannot buy a new 1999 pump from Mazda, the 1999 part number was superceded by the 2002 part number. If you call Mazda to buy a pump for a 1999 or later, they may sell it to you as a 1999 pump, but it will be charged and shipped as a 2002 pump.

As for size difference, I can attest that the 2002 pump is approximately .020" (20 thousandths of an inch) thicker than the 1994 pump. The difference in thickness is one of the contributing factors to BE no longer selling just the pump gears, but only full pumps. If you use the thick gear in the thin pump, your error is immediately obvious. If you use the thin gear in the thick pump, the pump will fail

OP, I would match the pump to the head, which is why I recommend a 2001+ (VVT) oil pump. The pump volume was increased, and the only notable increase in oil use came from the VVT Head.

I would expect that Mazda has also superceeded the 1994 part numbers to a single 1994 part number. Of the 5 part numbers you list, there is probably only one part number still in the inventory. I expect that Mazda has a total of 3 pumps in the inventory for NA/NB cars. 1.6, 1.8NA, and 1.8NB.

Don't skimp out on the oil pump. If a bearing fails, you have to replace that bearing. If an oil pump fails, you'll be replacing everything that spins or moves in your engine.

EO2K

iTrader: (37)

Interesting... if you go to the Boundary Engineering website, he lists "NA 1991.5-2000", "NB 1999-2000" & "NBB 2001-2005." If you go to each section and add the "Street/Strip" pump to your cart, then view the cart, you have 3x "Street/Strip High Performance Oil Pump
Pump Type:: 91.5-05 BP Engines, Oil Relief Spring Shimming: Stock Pressure (~60PSI)"

I don't know what that means, but based on it I would suspect they are all interchangeable with the BP series. I may have to email Travis and see what's up, maybe its an issue with the site?