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Whats The Difference In Rb26's

alex182

By alex182,
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alex182 Mentor

alex182

Posted
Posted

just out of curiosity i went on the intrawebs to look for an r34 rb26dett half cut or just the engine. I cant find any understandably (←is that right?) because well you dont see many r34 gtrs at the wreckers BUT i did see a few r32 RB26's so my question is, whats the difference between the 3?

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(OO)SKYLINE(OO) Grand Master

(OO)SKYLINE(OO)

Posted
Posted

If it is a base model GTR, then they are all the same IMO.

There have been a few refinements with the RB26's through out the different models + the engine producing slightly more torque, but that will be due to the tuning of the car.

Even with the slight tweaks here and there, it's not enough to say it's a totally different engine.

Visually the Cam / rocker covers are Red (R34 GTR) VS Black (R32 / R33 GTR)

The Letter "RB" and the numbers "26" are a different font style on the R34 GTR, but that's nothing to be concerned about.

But if you come across a N1 RB26, it is different to the base model engines.

alex182 Mentor

alex182

Posted
  • Author
Posted
If it is a base model GTR, then they are all the same IMO.

There have been a few refinements with the RB26's through out the different models + the engine producing slightly more torque, but that will be due to the tuning of the car.

Even with the slight tweaks here and there, it's not enough to say it's a totally different engine.

Visually the Cam / rocker covers are Red (R34 GTR) VS Black (R32 / R33 GTR)

The Letter "RB" and the numbers "26" are a different font style on the R34 GTR, but that's nothing to be concerned about.

But if you come across a N1 RB26, it is different to the base model engines.

alright thanks

GTRsean Grand Master

GTRsean

Posted
Posted

As above plus,

32 engines, 89 to roughly early93ish had the short oil pump drive snout on the crank.

All others have the longer pump drive.

34 cam timing cover is plastic.

Slighly different cam durations between the 32,33 vs 34.

Duncan Grand Master

Duncan

Posted
Posted
Slighly different cam durations between the 32,33 vs 34.

you know I've heard that said before but never seen proof? I've had a set of 32 cams degreed so if anyone has sstd 33 or 34 cams done we could check the results.

There may be a difference in the wiring, I've seen a coilpack loom with a different plug at the back.

GTRsean Grand Master

GTRsean

Posted
Posted

CAS wiring into the sensor as the R34's use a slightly different CAS, i think it's just a matter of swapping some pins, the CAS drive is different on the r34 CAM too I think.

Yep, coil packs on the 34 have the electronics on the coilpack, so no seperate ignition module like on the 32-33.

Duncan, your correct, the cams are the same specs, the only difference is the pre set valve timing is different on the R34 compared to the 32,33.

Tomei spread sheet shows 113deg on intake cam on 32-33, 117deg on 34.

125deg on ex for 32-33, 120deg on 33 N1, and 121deg on 34.

240deg duration intake on 32-33-34, 236deg duration exhaust on 32-33-34.

me_larr Community Regular

me_larr

Posted
Posted

32s also had that niggly problem with too much oil to the head and not enough left at the sump when pushed.

I think they rectified (sorta?) this problem for the 33s and 34s?

Just another thing to consider I guess. Unless of course the engine is getting a rebuild which would render this a moot point anyways.

(OO)SKYLINE(OO) Grand Master

(OO)SKYLINE(OO)

Posted
Posted
alright thanks

:laugh:

As above plus,

32 engines, 89 to roughly early93ish had the short oil pump drive snout on the crank.

All others have the longer pump drive.

34 cam timing cover is plastic.

Slighly different cam durations between the 32,33 vs 34.

32s also had that niggly problem with too much oil to the head and not enough left at the sump when pushed.

I think they rectified (sorta?) this problem for the 33s and 34s?

Just another thing to consider I guess. Unless of course the engine is getting a rebuild which would render this a moot point anyways.

I too have read about this.

But tend to fail at high power applications (if not changed).

If your R32 GTR is stock / lighly / mildly modified, it would be fine.

West Grand Master

West

Posted
Posted

Ppl talk alot but unless they've actually got their hands dirty, remove and re-assembly the engine then don't listen to them. 32gtrs engines are time bombs ticking away unless its been look after extreamly well, or built by somebody who knows or actually race their.

  • 3 weeks later...
Nee-san Grand Master

Nee-san

Posted
Posted

Hey Guys,

I'de like to add to this that, whilst there is an inherent problem with the oiling on 32 series RB26s, I believe in many cases there is an excessive exaggeration of the issue caused by generalisations made in popular media such as magazines etc.

I'm ofcourse not saying that there aren't issues but i think that people lose sight of the fact that many of the engines in question have done well over 100'000 Km and in many cases are over 20 years old and we are not talking about 100'000 km of light load either, everyone knows what people buy these cars for.

Just my 2c

Cheers,

Mitch.

BeEnAr Experienced

BeEnAr

Posted
Posted
Ppl talk alot but unless they've actually got their hands dirty, remove and re-assembly the engine then don't listen to them. 32gtrs engines are time bombs ticking away unless its been look after extreamly well, or built by somebody who knows or actually race their.

Is this true of all 32 RB26's? What about the later ones, or the V-SpecII? I was told V-SpecII had 33 GTR running gear but can't confirm that. Also if you overfill the engine near 1L you can alleviate this.

It is also more a problem on track than on road as it's in high G loads that this happens because the sump is not baffeled good enough.

Duncan Grand Master

Duncan

Posted
Posted

sorry I disagree....the oiling system is absolutely identical in all motors other than the narrower oil pump drive. I have seen a couple of motors with wear or spun oil pump drives but it is less than 1 in 100 rb26 failures. In fact, go into GTR_Geoff's engine failure thread and find me a single instance where that caused a failure.

All of rb26 series motors can do with some minor improvements for their oil systems....but after 15 years wear on the pump clearances, bearings, crank straightness, rings, pistons, bad tunes, bad oil changes etc etc etc are much more likely to cause issues.

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