Rb26 Oil Pump On Rb30

[MrSquigle]

I have a good condition RB26 oil pump I am looking to run on RB30 build up and wondering if anybody can provide info from their experiances. I am looking for a crank collar to suit.

What I need to know is the std RB26 pump a good option?

I belive the oil pump breakages occur due to too high oil pressure any ideas?

What oil restrictors will I need for the head SOHC?

I here of people taking out a spring to reduce oil pressure?

Any experianced people in this would be highly appreciated. I am having a go at this build myself and appreciate the wealth of knowledge people offer on the site.

thanks in advance.

[den001]

stock 26 pumps are shit, they shatter, better off to run your rb30 pump, stay off the rev limiter and it will live a healthy life

[SS#eater]

search there is so much info on this... so much....so so much.....

[Bliksem]

I run an RB26 pump on my RB30DET, have not heard of the shattering problem on the 26 pump, although I have read many reports of that problem with the N1 pumps.

Running a crank collar is a good idea as the RB30 crank does not engage the oil pump gear the full width.

Heres a few pictures I took whilst comparing my RB26 pump against the stock RB30E Pump:

RB30E

RB26

Notice the RB26 pump gear is about 3 times the width of the RB30

[MrSquigle]

thanks guys, this is the last thing to decide on and engine can be assembled. i have both pumps pictured above what should i go with? would i have to modify spring for oil pressure for rb26 pump? what is the cause of the rb26 shattering too high oil presure?

appreciate all the feedback on this

[Drift Motorsport]

Search for the Sydneykid Oil control thread for more info.

1) Run a 1.25 - 1.1 restrictor in the front oil feed to the head

2) Block the rear oil feed to the head

3) Run the RB26 pump (R33-R34) with an oil pump collar (you can buy it from the CNC guy who seels them on the form for around $79 Delivered)

Even the factory RB oil pumps - pump too much oil to the head at constant high RPM. There is no need to upgrade to a super duper $1000+ factory fitted oil pump.

That being said - there have been plenty of VL owners spinning their RB30 SOHC and DOHC setups to 6500rpm without many issues on the drag strip and street using a stock oil pump.

[Guilt-Toy]

I heard that RB30's don't break oil pumps like 26's do because the crank's are heavier

[den001]

^^^ thank you, exactly my point.....

like i said in the first post, use the rb30 pump with a collar, rb26 pumps are shit.... unless they are aftermarket

[RB26SX]

Make sure to fit oil restrictors if you use RB26 / 25 pump. I used RB25DET pump in my RB30DET with no oil restrictors in the block, now I have problems with oil coming out the breathers at constant high rpm(6000-7000rpm). Busy fitting second oil drain on rear of head to help with oil return.

[STATUS]

Make sure to fit oil restrictors if you use RB26 / 25 pump. I used RB25DET pump in my RB30DET with no oil restrictors in the block, now I have problems with oil coming out the breathers at constant high rpm(6000-7000rpm). Busy fitting second oil drain on rear of head to help with oil return.

i doubt it will fix it, i would bite the bullet and pull the head.

[twinvl]

I run an RB26 pump on my RB30DET, have not heard of the shattering problem on the 26 pump, although I have read many reports of that problem with the N1 pumps.

Running a crank collar is a good idea as the RB30 crank does not engage the oil pump gear the full width.

Heres a few pictures I took whilst comparing my RB26 pump against the stock RB30E Pump:

RB30E

RB26

Notice the RB26 pump gear is about 3 times the width of the RB30

Have you pulled the pumps apart????

The RB30 gear extends into the pump housing where you can't see it.

The RB26 pump gear is narrower than the drive.

The gears are about the same thickness!

Just the RB30 inner gear is has more 'meat' from the drive to the teeth making the narrow drive not a problem (assumed since they don't fail).