Hello.
I have b18c4 engine and it is with 80mm oil pump. I checked the part number of b18c5 oil pump and it is the same as b18c4. I already have 3 b16 oil pumps and they are 80mm, too.
Which pumps are 84mm? How to find them? Which oil pump is the most powerful for b18c?
Thank you!

 

They're fine for any bore size.

 

Are you referring to the 84mm oil pump GEAR? Those were used on the older 90 models. Any oem P72 Oil pump will work fine. You don't want it to have "the most powerful oil pump", because you could harm other components w/ too much oil pressure. If you want to go sump, that is another story.

 

I mean 84mm pump gear. I want to upgrade my pump. I am not trying to increase the oil pressure. I just want to add extra flow. Which is the best stock oil pump?

 

IIRC there is only one pump for b-series vtec now (no matter which one you order it is all a p72 number)

 

I know that P72 is with 80mm gear. I heard that there are pumps with 84mm gear. Toda offers 84mm gear, too.

 

all b-series oil pumps are the same. the gear's you see for sale by toda and others require you to modify the pump casting so you can fit it inside.

 

Which is the best oil pump that i could buy under 200$?

 

I'm using a modified oil pump that has been ported and the gear rotor was replaced with a CNC billet gear. works great. good flow and oil pressure even when the oil is scorching hot.

i bought it last year from this guy:

http://cgi.ebay.ca/CIVIC-INTEGRA-LS-...3A1%7C294%3A50

 

I bought their Stage 2 Oil Pump that is supposedly good for 11,000 RPMs. I was pissed off at the quality of the ports and overall work. Plus they painted it this crap color and put a very cheap seal in it. I spent almost $400 on it with shipping if I remember right and after about 10 passes at the 1/4 mile strip and two SCAA events the pump failed. Their CNCed gear beat up the housing and the pump lost major pressure. I almost lost the motor. This was revving to 9,900 RPMs. Also the oils pressure was way too high it was maxing out my gauge (over 100 psi) with 10w30...

 

Also just in case any clowns try and speculate: the motor was balanced with everything to 1/2 a gram including the valvetrain. I do this on all my Honda motors when possible and never let it get more than 1 gram out of balance, even though this is still a bit overboard. I also had a true harmonic balancer on the motor.

 

wow that sucks to hear....my "stage 1" has been fine so far.

 

As I said in my previous post. All current B-series (GS-R P72) use an 84mm gear, only older 90 model B16s (88-91) use the 80mm. The larger diameter gear does not help w/ performance. The TODA PUMP GEAR's purpose is not to increase oil pressure, but is made from a better material to keep it from shattering in endurance circuit racing conditions. Be careful of increasing a lot of oil pressure, as this could affect the pressure going to the turbocharger. This is one of those, "if it ain't broke, don't fix it" scenarios.

 

I've replaced several oil pump gears with the TODA unit, and have not had the need to modify anything in the assembly