Well I was just cleaning up my oil pump off my old A6 motor when I realized that the oil pump off my new zc swap was different. Can anyone give any insight to as which pump might be better for a high compression build? In the pics below the A6 pump is always the top (and dirty lol) pump in the pic. As you can see the A6 has a bigger gear but a smaller channel. The zc is just the opposite, smaller gear but a bigger channel? Any info or suggestions would be great.

 

I'm leaning more towards using the A6 pump due to the fact that it looks like it flows more then the zc pump. Just trying to make the most out of what I got.

 

https://honda-tech.com/forums/showth...p#post41114691

Try a dohc zc oil pump if you can get one. Good Luck.

 

do you know what sohc zc engine you have? carbed, mpfi, year?

 

I'll have to look into the dohc zc pump thing, and I think it was a 90 mpfi sohc zc.

 

I have a spare d16a8 (twin cam dohc) on a stand at the moment, if you need me to take measurements etc let me know.

 

I would greatly appreciate it. If it does flow more, and is a direct bolt on then that's the one I need.

 

i'd like to see the comparison to the A8 pump too.

because i think since the ports are bigger on the SOHC ZC one, its meant to flow more. despite the smaller OD of the ring. i think they HAD to make the diameter smaller to accommodate the larger flow path if you look at the pics.

and finding SOHC ZC's in the junkyard is pretty easy....

is there any other casting mark difference on the outside?

and DAMN, how the hell does the ZC one look so clean??

 

The only diff is on the plate that covers the gear. The Si pump has a 9 in the casting and the zc has a 8. I'll take more pics when I get home. I was kinda think that despite its smaller gear the zc might actually flow more due to its larger chamber. Anyway you look at it, the si pump has smaller chamers. So it might have good pressure but you limit the flow. Then again that can be agrued both ways (pressure vs volume) :/.

 

pressure is only useful at the END of the nozzle, not anywhere in between. restricting the flow in the middle is just a restriction... think of a hose, a kink in the middle is not helping the ultimate goal... you lose pressure/flow after the kink. but a nozzle, or jet sprayer serves its purpose by restricting the flow and spraying out. more flow behind the nozzle, the more spray.

 

No worries, i'll have time over the next few days.

 

Good work