20 Or 25

[grem]

hey guys im new to this forum, new to nissans aswell having owned a subaru for the last 3 years. im about to buy a cefiro.

the one im looking at supposedly has a rb25det in it, i just wanna know how i can tell it from a rb25.

[sleek3]

i have looked at a few motors especially ones in gts-t's from R32 to R33, the biggest difference i seen is the cam cover, RB20 has RB20 imprinted on it and you wouldnt miss it because it is on the front top.....on the RB25 like mine doesn't have anything printed on it....as far as i know RB20's and RB26's have the imprint....hope this helps mate

[RB SANDY]

also at the back of the rocker cover there is a hump the rb25s are a much better then the 20 it is good to see your going 4 a nissan

[sonoramicommando]

The dead giveaway is that R32 engines have #5 & 6 plenum & inlet manifold runners offset towards the centre of the car whereas #1 thru 4 runners are a little bit outboard.

That applies to RB20DE, RB20DET & RB25DE as far as I know.

Edited April 29, 2008 by sonoramicommando

[QWK32]

not all rb20's have RB20 stamped on the cam cover, from what i understood it was only the 89-90 model ones.

as RB SANDY has said the 25 has a raised section towards the end of the rocker cover and the 20 doesn't. also most of the 25's have a raised bump on the front came cover for the VVT. and the intake plenums are noticably different from each other. the way the oil breather line fittings are facing is also different between the two, as is the stock BOV setup, RB20's are vertical and RB25's are horizontal.

best thing to do would be to look at as many pics as you can of the two and see if you can find all the differances.

[Adriano]

Sorry if it sounds obvious, but i would look at the engine number if i was buying the car.

[Mark_McQ]

Front of the pulley cover will have a raised area on the drivers side if it's an RB25.

[Mark_McQ]

Front of the pulley cover will have a raised area on the drivers side if it's an RB25.

D'oh, someone already mentioned that.

[Oblivion]

VCT section is raised is the dead give away along with the cam covers

and also the mod plate......if it says rb25det....if it doesnt and it has one then dont buy it until they get you a mod plate...illegal otherwise.

[Pun4N1]

from memory all RB's have RB20, RB25, RB26, or RB30, on the left hand side of the motor (exhaust side) about half way down from the top of the block casting. on the 3rd cyliner back from the front

Edited April 30, 2008 by Pun4N1

[bubba]

There should also be the full engine number on the exhaust side just before the bellhousing..

[grem]

ah ok thanks. heaps of info, awesome. the numbers that a rb25det will put out are just so much bigger than an ej25t, so ive come to the other side. cant see this handling like the liberty did though.

also... i meant rb20 in the end of the first post but i think you guys all picked up on that.

Edited April 30, 2008 by grem

[bubba]

Should be able to get the ceffy handling pretty well.

IMO all those era cars (including my 32) were lacking was a decent engine.. hence my twincam 30

[Krishy]

i know a few people who have got their RB20 and RB25 ceffy's handling pretty damn good....ohh and i think this is already mentioned but i would say that check the mod plate mate......that should give you some details

[TTT]

just by looking at it, you can see obvious differences.

main one is the inlet manifold..

RB20:

RB25:

also, a stock RB20 in a Ceffie will not have a stock bov.

study the 2 pics.

easiest way to tell.