Stroker Vs. Hybrid

[fattox33]

Hey guys,

What does everyone think in regards to going with a hybrid motor aka rb25/30, or going with a stroker and rb26 head?

The main build plan is just for a dirty old r31 with a big dash of sleep =D then take it to dyno days and snap ridiculous boost into it, see how well it takes it

Myself building it, with a good mate who's a qualified mechanic (and knows RB's pretty well)

Opinions? I'm not overly a fan of the rb25/30, the plan was a stroker with rb26 head as the 26's love revving more, but i'm interested to see what people have to say?

[joeyjoejoejuniorshabadoo]

it's a 31... it doesn't deserve any more than a slapper 25/30

[DVS JEZ]

haha ^^^ good ol slapper,

stroker will be more expensive

[NYTSKY]

Assuming the budget is on the smaller side id suggest doing the hybrid.

With the stroker you will be up for $8000+ just for the bottom end.

[PM-R33]

As Dave has said. I don't think you have looked into the costs of a properly built Jap stroker RB26 engine.

This topic has been covered to death now. Please search.

[fattox33]

oh the budget is around the 20k area,no labour costs involved just tuning, the only thing i'm wary of is with bigger turbos you need higher rpm, and RB30 cranks aren't known for their perfect harmonics at higher revs so where the 26 would be laughing and saying MOAR BOOST the RB30 would be a bit dodgy and losing stability.

I know the fact of the RB30 stability issue from an example given in one of my engineering lectures in engineering design, it came up as the lecturer loves skylines haha, wasn't perfectly balanced from factory

[WHITER33GTS-T]

Nitto 3.2 stroker with 26 head.

[PM-R33]

oh the budget is around the 20k area,no labour costs involved just tuning, the only thing i'm wary of is with bigger turbos you need higher rpm, and RB30 cranks aren't known for their perfect harmonics at higher revs so where the 26 would be laughing and saying MOAR BOOST the RB30 would be a bit dodgy and losing stability.

I know the fact of the RB30 stability issue from an example given in one of my engineering lectures in engineering design, it came up as the lecturer loves skylines haha, wasn't perfectly balanced from factory

[snozzle]

does that lecture get recorded as an ilecture? if so please link us to it!

[NYTSKY]

With a properly balanced crank, balancer and studs you can rev it where ever you want.

[ezy_09s]

oh the budget is around the 20k area,no labour costs involved just tuning, the only thing i'm wary of is with bigger turbos you need higher rpm, and RB30 cranks aren't known for their perfect harmonics at higher revs so where the 26 would be laughing and saying MOAR BOOST the RB30 would be a bit dodgy and losing stability.

I know the fact of the RB30 stability issue from an example given in one of my engineering lectures in engineering design, it came up as the lecturer loves skylines haha, wasn't perfectly balanced from factory

Ha ha ...you better inform R.i.p.s he doesnt know what he's doing and tell him he cant be revving those rb30 cranks past 9000rpm.

Many guys have built very strong rb30's ..but a dirty r31 deserves no more than 25 head slapped on a 30 bottom end.

[bubba]

With a properly balanced crank, balancer and studs you can rev it where ever you want.

This ^^

/thread

[Lithium]

I know the fact of the RB30 stability issue from an example given in one of my engineering lectures in engineering design, it came up as the lecturer loves skylines haha, wasn't perfectly balanced from factory

Dodgey lecturer, balance the bottom end properly and it should be fine. I wouldn't be revving a normal VL RB30E over 7000rpm - but if you are going to build a new engine those generalisations don't apply.

[Nee-san]

He could be right, I'm not saying anything either way but obviously there are alot of RB30's that rev ludicrously hard so in applications terms IE in our cars the difference may be so minimal that it isn't worth discussing.

There is however a 14% increase in stroke length between a 26 and a 30.

[PM-R33]

All RB's have bad harmonics from factory, it is nothing simply assosiated with the RB30 crank not being perfectly balanced. With the length of the RB crank, harmonic vibrations are always going to be an issue.

[Lithium]

And a RB26 is a ridiculously short stroke.... RB30 has the same stroke as the current Type-R Honda motors run

[Deano 1]

Ha ha ...you better inform R.i.p.s he doesnt know what he's doing and tell him he cant be revving those rb30 cranks past 9000rpm.

Many guys have built very strong rb30's ..but a dirty r31 deserves no more than 25 head slapped on a 30 bottom end.

+1

[FineLine]

Well OP how about you just go for Win win win.

Get the Nitto 3.2 stroker kit with the counter balanced crank, Rev its arse off, make more power and torque than any jap stroker kit ever dreamed of And save yourself a wad of cash over the ridiculously priced japanese branded counterparts.

[Nee-san]

And a RB26 is a ridiculously short stroke.... RB30 has the same stroke as the current Type-R Honda motors run

+1

[Risking]

If you have a 20k budget why on earth would you even entertain the idea of using an rb25 head.