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Forged Rb20

N1 RB26

By N1 RB26,
in Engines & Forced Induction

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Marlin Grand Master

Marlin

Posted
Posted

Could easily be original.

My old engine only recently came out, had never been apart or out in it's life. Not even a head gasket. I've raced the shit out of it for the last 3 years, someone else did before me, and who knows what it did before that since 1989....

Engine still had bore hone marks. Only thing that killed it was a big end failure..... I did a session of 30+ flat out laps in a Qld summer dicing with Group A cars, without an oil cooler. No doubt in my mind the oil would have been so thin it simply lost it's ability to lube.

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Driftnuttz Enthusiast

Driftnuttz

Posted
Posted

Yeah maybe, but from what I have seen they would not look this good. I mean they really look as if the hone was just done. I moved the pistons side to side and there was little to no movement. The big end looks good too, so with a gasket kit and arp head studs it should be a nice motor.

Driftnuttz Enthusiast

Driftnuttz

Posted
Posted (edited)

You can make it flow more and still keep the air speeds up, like I said I am not just going to make the ports as big as I can. The good head builders here in the states do it all the time. Thats how you make the best power with a usable power band.

I have never seen a motor here with lots of miles and failing rings look so good. Most of the time they are real faint if visable at all. Really though it doesnt matter as I was not planning on reringing it unless the cylynder walls were messes up. No scares or scraps and plenty of hone left. Arps and a oem gasket kit and I think I am golden. The big end looks good too.

Anyone know if a oem gasket kit comes with a waterpump gasket? I have a new pump but no gasket with it.

Edited by Driftnuttz
N1 RB26 Contributor

N1 RB26

Posted
  • Author
Posted

well everyone was bagging the hell out of the 20 cause you cant get decent power with out spending endless amounts of money but it seems the RB24 isn't as bad as everyone seems to think and not as expensive as well considering people have been able to build these for 5-6k and brings on a turbo quicker than a 25

N1GTR Grand Master

N1GTR

Posted
Posted

Fair enough, but a fairer comparison would be a rb20 dyno sheet then the same car with the bottom end swap rather than someone sliding around and kicking the clutch to make smoke.

Smoke isn't a fair indicator of power. :)

Bl4cK32 Grand Master

Bl4cK32

Posted
Posted

well everyone was bagging the hell out of the 20 cause you cant get decent power with out spending endless amounts of money

No, pretty sure they weren't. People were saying that spending the money in the right places made more sense than rebuilding / forging a motor that is already reliable and can make decent power up to a point.

but it seems the RB24 isn't as bad as everyone seems to think and not as expensive as well considering people have been able to build these for 5-6k and brings on a turbo quicker than a 25

No one said the 24 was bad, there are a few on here before who have already built them, with threads on results. The point was for the same 5-6K you can have a built 2.5 or 3lt with a lot more drive-ability and potential. Bringing the turbo on quicker is irrelevant...what turbo, what engine? GT40 on a 2lt vs a 2530? Right turbo matched to the right motor for the right job.

The Mafia Grand Master

The Mafia

Posted
Posted

got a bit of "fulleh sic uleh" in that video.

What a wanker though.

I could make a commodore smoke like that.

Good luck with your "I'm a special kid" RB20 projects. When your wallets are empty, and you're crying because stock RB25s and RB2530s are lapping you, I'm going ot laugh my ass off.

N1 RB26 Contributor

N1 RB26

Posted
  • Author
Posted (edited)

Bringing the turbo on quicker is irrelevant...what turbo, what engine? GT40 on a 2lt vs a 2530? Right turbo matched to the right motor for the right job.

from what i gathered maybe wrong and talking to people but wouldn't a RB24 bring on a turbo quicker than the 25 if both ran the same turbo? cause of the head isn't that the point of 25 head on a 30 bottom to make it more responsive? cause a 24 for would be forcing a similar amount of exhaust gas out as a 25 but through a smaller port there for increasing the velocity which the exhaust gas comes out...or am i way off?

Good luck with your "I'm a special kid" RB20 projects. When your wallets are empty, and you're crying because stock RB25s and RB2530s are lapping you, I'm going ot laugh my ass off.

haha couldn't see that happening as from what i've heard Roy's standard 20 can easily keep up with the "big boys" out on the track so much more a 24 could and i'm doing the 24 as a side project as a bit of fun and doing bolt ons for the standard motor i'm putting in atm and i'm not fussed bout 25's lapping me (if they can) it's all for fun and if you don't have fun with it then what's the point of doing it :thumbsup:

Edited by Forged R32
N1 RB26 Contributor

N1 RB26

Posted
  • Author
Posted

Yeah realise that but with slight port you could get them up to speed surely...??

Can anyone post up links to 24 builds can't seem to find them my eyes must be painted on lol

and has anyone on here done a rb24 ? Can you post setups and dyno figures and what kind of response driveability?

Rolls Grand Master

Rolls

Posted
Posted

Yeah realise that but with slight port you could get them up to speed surely...??

Can anyone post up links to 24 builds can't seem to find them my eyes must be painted on lol

and has anyone on here done a rb24 ? Can you post setups and dyno figures and what kind of response driveability?

That is the whole point, porting a head usually decreases velocity and makes it worse down low.

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