Rb30 Crank In Rb26 Block

[SLAPS]

The rev debate...... (apart from racing regs duncan)

Who needs more than 9000rpm anyway, apart from RIPS who pulls 10,000 from his drag car (still stock block and crank) I fail to see the problem.

As the 26's also require. A good set of rods, pistons, aftermarket balancer and the ol' rb30's in their thongs and black skin tight jeans hang in there for 9000rpm no issues.

9000rpm+ for an RB30 is well in to GT45 hp territory lol.

The old RB30ET's with a little headwork + cams push 8000rpm on stock rods lol (with a balancer) and RB30ET pump. Not the DOHC crapo style pumps.

[ZILR-34]

unless you happen to get some miracle price in the first place (or buy something thats going up in value aka not a skyline) you never get your money back on a car modified or kept bog stock.

yes thats true. you will never get the true value of the car back.

but ill rather spend more cash on a Virgin skyline than somones else whore of a skyline what's been around the block.

so having a stroker kit makes it look like a virgin but having more power with aftermarket blot-ons

[manage13]

Racespec - Not Racepace

No way a Racepace 2.9ltr would cost 8k

Ash any idea how much it is? I have tried to call Racepace however had issues getting through.

[STATUS]

who trent? I need to fit a 30 crank in a 26 block

did you ever speak to crank shaft rebuilders? if not i will ask when i go down next. I have a few GTR cranks to get straightened that i acquired from here and there.

[Duncan]

not yet, no rush atm....but its good to know options when we're ready to go

[sh@un]

I know this is a little off topic and a little Tabooo. BUT does any 1 know of any attempts to mate a ford 4L Barra 6 to a GTR front diff/transfer case?.

aside from the fact that trying to fit a Ford engine to a Nissan is probably classed as a crime against nature under international law, the front diff and steering components would cause one helluva headache with regards to exhaust routing

[Raysboostin]

I saw it this way back in 1999 with first RB30 in R32 I did and I still see it the same way now. What am I missing?

Cheers

Gary

your missing the fact that if ur car is registered (at least in qld anyway), it is completely illegal to put an rb30 in any car built after 1989. before u start saying "grind the numbers off" thats even more illegal. some of us want to keep our cars on the road rather than defected every time u drive it. the cheapest option is not always street legal.

[TiTAN]

it is entirely possible to have a street legal 30. they have been done before and will be done again if the car came standard with a 2.5L or 2.6L engine the 3L falls within the 20% capacity increase. combined with emissions testing and an engineers certificate for the modifications you have it is a legal mod. (though this is affected by which state you live in vic and SA seem to be the hardest to get it done in)

[Roy]

So if you run one of these uber duber RB30 cranks that have been offset ground can you still run std RB30 deck height pistons with std RB26 rods, or do you need custom mating pistons for the RB30 crank?

[Raysboostin]

it is entirely possible to have a street legal 30. they have been done before and will be done again if the car came standard with a 2.5L or 2.6L engine the 3L falls within the 20% capacity increase. combined with emissions testing and an engineers certificate for the modifications you have it is a legal mod. (though this is affected by which state you live in vic and SA seem to be the hardest to get it done in)

uve got it all wrong. swapping an RB25 or RB26 over to an RB30 is not a capacity increase like using a stroker crank. changing engine blocks is an engine swap. in QLD (dunno how other states view it) u cannot put any engine into a car that is newer than the engine. so if the engine was not oem equipment for the car it must be the same age or newer. EG: if ur car is made in 1994 ur engine must be 1994 or newer.

i dont remember exactly but something about emissions and safety standards. so if u do happen to get pulled up by qld transport (which i have been many times) and they discover uve broken this rule, be prepared to walk home!!

i'll call the modifications office again and get a clear and definitive answer on the reason.

[TiTAN]

the age rule does not apply to a change of the bottom end as all the emissions stuff is in the head (or connected to it) and the tune which remain the same age or newer than the engine that was in there

it is in essence the same as using an OS Giken RB30 kit except the block already has the spacer plate integrated from factory.

[Adriano]

Just had an rb30 r33 passed roadworthy (blue slip) in qld

[MBS206]

uve got it all wrong. swapping an RB25 or RB26 over to an RB30 is not a capacity increase like using a stroker crank. changing engine blocks is an engine swap. in QLD (dunno how other states view it) u cannot put any engine into a car that is newer than the engine. so if the engine was not oem equipment for the car it must be the same age or newer. EG: if ur car is made in 1994 ur engine must be 1994 or newer.

i dont remember exactly but something about emissions and safety standards. so if u do happen to get pulled up by qld transport (which i have been many times) and they discover uve broken this rule, be prepared to walk home!!

i'll call the modifications office again and get a clear and definitive answer on the reason.

You need to re-read your rules and regs...

You CAN put an old engine in a new car, BUT you have to get said old engine up to new car emmision laws...

That is the rule, emmisions must meet what ever is newest.

[daisu]

The RB30 was available in the GQ patrol upto 1997 anyway, so moot point.

[Sydneykid]

not yet, no rush atm....but its good to know options when we're ready to go

I'd copy the OS Giken process, RB30 crank, RB26 rod length, 2 head gaskets, 12.3mm (1/2" milled) spacer plate and tall liners. With an 87 mm bore that will give you 3,069 cc's. That's 600 cc's (~20%) more than you have with a standard RB26.

Not an ideal rod stroke ratio, but OS Giken weren't totally wrong, it's about the best you can get from an RB26 block. You can't use RB30 length rods as the spacer plate would be too thick (30mm) and the cylinder liners would poke out of the block too far.

All you have to do is give a headgasket to a machinist and say copy that in 1/2 steel plate. Mill the spacer plate flat, bolt it on an RB26 block and then have the liners installed, shrink to fit, then bore to 87 mm and deck. Not a big deal really.

Cheers

Gary

[proengines]

If you're going to go the spacer plate route you're better off using an SR20 rod seeing you're already making a spacer plate you might as well get the rod ratio better. You also get 22mm pins as a bonus. You need to reduce the stroke slightly to get everything to turn inside the cradle without a lot of modifying and it's not a big hassle given you need to machine the big end journals down anyway to fit the RB26/SR20 rods.

I had one dummied up ages ago and it's a lot of work to do, crank work, flanged sleeves, spacer plate, custom studs, sealing the spacer plate etc etc.. using an RB30 block is a lot cheaper. Not necessarily better but definitely cheaper.

[zebra]

Interesting discussion on rod / stroke ratios.

the current gen MOPAR R5 nascar engines run a 3.25" stroke with a 6.25" rod at 358cubes so the ratio is 1.923:1 and make 800+hp aspirated through a single 4 barrel

They do however have the advantage of a big bore V config block to get a short stroke long rod combo that we unfortunatley arnt blessed with in a skyline unless we want 1.6L RB26s that rev to 14k lol

Im actually suprised the likes of Harrop / C.O.M.E racing havent produced a cast stroker crank for the RB's...no real need for billet unless you want 10000rpm imo

[Lukas 33]

How the hell do you get an rb35?!?!?!

[STATUS]

Im actually suprised the likes of Harrop / C.O.M.E racing havent produced a cast stroker crank for the RB's...no real need for billet unless you want 10000rpm imo

Market is way to small.

[Raysboostin]

You need to re-read your rules and regs...

You CAN put an old engine in a new car, BUT you have to get said old engine up to new car emmision laws...

That is the rule, emmisions must meet what ever is newest.

so after 2 hours on hold i finally got through to someone in the modifications department. i explained the idea of an rb30 into a skyline and straight away was told it could not be blue plated because of the engines age. but after explaining the idea of using the skylines oem head and pollution control all i could get was a maybe. the fellow was unsure as this is a grey area in thier rules.

he said to talk to an engineer that can blue plate engine swaps and see what they say. so far ive spoken to 5 and they all said they wouldnt do it. so there u go, if u can find an engineer to pass it, ur in the clear i guess.

Just had an rb30 r33 passed roadworthy (blue slip) in qld

let us all know who approved it for u so we can get it done.

The RB30 was available in the GQ patrol upto 1997 anyway, so moot point.

even though its kind of irrelevant now, how is it a moot point if u have a 98-99 model??