Crank Collar Needed For A Rb25det Crankshaft ?

[Behind Horizon]

Hello guys,

i read a lot of "oppinions" about the "crank-collar-case" until now however i'm not sure about a few things.

I have a JUN oil pump and do i need to fit a crank collar on my RB25DET '95 (Series 1.5) engine or will the RB25DET

crank match the JUN Oil Pump perfectly ?.

As i heard only the "most" R32 GT-R RB's have problems, but didn't heared anything about the RB25DET ??.

------

The next thing, if i'm understanding right that the collar have bigger flats to run the oil pump, do you mean wider flats, or longer flats, or both ?

Thanks in advance for your help guys.

[R31Nismoid]

RB25 is the same as the R32 i believe.

[Swiper the Fox]

RB25 is the same as the R32 i believe.

smiley stamp for you

[rb26s13]

smiley stamp for you

is that all rb25's? or just ealry model ones?

[R34GTFOUR]

is that all rb25's? or just ealry model ones?

short answer: you will need a crank collar

longer answer: all rb30, rb25, and early model r32 rb26 cranks are narrow and need the collar, the later model r32gtrs, r33gtrs and r34gtrs have a wider "snout" and dont require the collar to fit a pump like the jun

Edited July 10, 2008 by R34GTFOUR

[Behind Horizon]

OK guys can you please help me to understand this, some are speaking that the flat surface isn't that wide as it should be.

Do you mean the width of the flat surface or the length of the flat surface or both?.

I need to know this to be able to explain it to my engine builder.

Check this:

[Swiper the Fox]

OK guys can you please help me to understand this, some are speaking that the flat surface isn't that wide as it should be.

Do you mean the width of the flat surface or the length of the flat surface or both?.

I need to know this to be able to explain it to my engine builder.

Check this:

length...your engine builder doesn't know this??

send it to me.

[robots]

http://forums.racebread.com/index.php?topic=1585.0

[Behind Horizon]

OK guys, thank you very much for your help guys i see what u mean now. I'll bring the engine back to him and let him fit the collar then.... damn it!.

[R31Nismoid]

If he didnt already know, cant be that experienced with RB's... make me wonder about other things like oil control etc

Sounds risky to me

[Swiper the Fox]

If he didnt already know, cant be that experienced with RB's... make me wonder about other things like oil control etc

Sounds risky to me

yeah RB's are a bit more involved than a Holden Red motor.

Edited July 11, 2008 by DiRTgarage