Boundary Engineering pump gears fitment
 

Hey guys. I wanted to touch base with y'all in regards to the BE pump gears. I am putting them in a friends engine that i am building. He had a great condition VVT pump already, just needed the upgraded gears. When test fitting, the BE inner rotor wont slide all the way onto the crank. While the stock inner rotor slides all the way on without a problem. This concerns me because there should be some ability for that rotor to float so that it does not get pulled back and forth with crankshaft thrust. I assume they tighten to tolerences to make a stronger gear but this is a bit too tight it seems. anyone else experience this issue? I would rather not have to do any work to the crank to make them fit. I will be emailing BE tomorrow but wanted to check here first since i have seen that there are a few here that have them. Thanks for your replys.

Crank condition
Attachment 230395

BE inner rotor
Attachment 230396

Stock inner rotor
Attachment 230397

have it replaced. that doesn't seem normal to me

This may not be related but you mention that you are replacing the gears in a VVT pump but when I last spoke with BE they did not offer just the gears for the VVT pump, only the regular. Maybe that could be causing the issue although I'd think it would have the opposite problem as the VVT is a little thicker?

Yes they do; Mazda\Ford BP Oil Pump Gears ? Boundary price is higher for the VVT gears but they do offer them. The page is a bit confusing but if you select "yes" under VVT it get's you to the right one.

Stupid question, have you tried orienting 180 degrees? Looks like maybe the internal flats, or the crank flats, may be at the tolerance limit for centrality to the bore. Just a thought.

After discussing this with BE and sending them measurements, it is still unlear exactly what the problem is. The tolerences SHOULD be ok, but there might be something tapered or out of round i think. However BE is awesome and is sending out a new set of the in house built gears to me and i am returning these. Major props to them and the support.

I talked to them a about 6 months ago and they either stopped selling them or they had removed them from the site( I dont remember which it was). I know they used to and that was why I called them but they told me at that time they stopped the VVT ones to reduce complexity but it looks like they may have started making them again. That sucks because that was what I wanted but I cant complain about having a fresh blueprinted oil pump

Sorry to Derail the thread, I purchased a BE Pump from a guy on here just trying to tell if it is in fact an actual BE gear set?

If it's a real BE pump it should say so on the front. Otherwise I guess you'd need to pull it apart and look at the gears. Not sure how to identify the gears (serial #??)

Yeah no numbers at all, guy I brought it from said it was from the first group buy? No markings

Reusing someone else's oil pump is like reusing someone else's condom

If you clean and leak test it I'm not sure what the issue is :giggle: