GTR oil pump on RB20

[Ahh32]

just want to make sure that a R33 GTR oil pump will fit in a RB20?

is the only diff. between a R32 and a R33 pump the part where it runs off the crank is longer.

[BlueRB240]

Good question

TTT

[GTR-Ben]

Well a GTR pump bolts up to the RB30.. so I would say it would bolt up to any RB engine.

The part being longer where it runs on the crank won't matter.

[Sydneykid]

There are two types of RB26 crankshaft, let's call them "early" (R32 and R33) and "late" (R33 and R34). The RB20, RB25 and RB30 cranks are the same as the "early" RB26. So if you have an "early" RB26 oil pump then it will fit the RB20. If you have a "late" RB26 oil pump it won't fit, but you can buy an adaptor ring. Jun make them amongst others.

Hope that helps

[Ahh32]

By the sound of it the late model ones have a different or bigger part where the oil pump funs on the crank. correct?

R33 V specs are usually later models aren't they?

[ed]

There are two types of RB26 crankshaft, let's call them "early" (R32 and R33) and "late" (R33 and R34).  The RB20, RB25 and RB30 cranks are the same as the "early" RB26.  So if you have an "early" RB26 oil pump then it will fit the RB20.  If you have a "late" RB26 oil pump it won't fit, but you can buy an adaptor ring.  Jun make them amongst others.

Hope that helps

When you say RB25, does that include the Neo?

Or would the neo be using the same crankshaft as the 'late' RB26's?

[Ahh32]

The pump is from a 95 R33 GTR vspec. what are the difference. too long, too small,

[Sydneykid]

The pump is from a 95 R33 GTR vspec. what are the difference. too long, too small,

The pump is driven using flattened areas on the usually round crankshaft. Like this (there is a flat at the top but I can't draw it on this thing) (_)

The "late" RB26 cranks have bigger flats and a larger diameter crank (in that spot). So you can easily stick a donut on the "early" crank and then stick the "late" oil pump on the donut. The donut has small flats on the inside and large flats on the outside. Works perfectly. You can buy donuts separately, Jun make them amongst others.

Hope that helps

PS; I have not pulled a Neo so I don't know whether is has the late or early. But I have see nothing about it being different from the early RB25 cranks. Since the mod was race required, I suspect it was only GTR's that needed it.

[lukevl]

hey SK- I have an early model Skyline Pump (Nose diameter and flat distances are the same) but the one concern I had was that ther wasn't enough overlap between the flats on the pump gear and the crank (RB30 crank). Have you ever seen these fail from this problem?

Also what is the nose diameter difference (and distance between the flats) between the early and late 26 cranks? I assume its a few millimeters at least?