GT-RZ

I think the TB48 all by itself is a better option without a different head... i think you can stroke them to 5litres too??? i just never thought about one of them in lil ol silvia. big engines. dammit. i have two rb30's here and now i want a Tb48!!!!! lol. seems there is support for them too http://www.briancrower.com/makes/nissan/tb48.shtml

The bores could only be thicker on the sides of the block was my point as obviously the material between bores is constant with that of the other RB's (once bored out to 86mm) but realistically i get what your saying as sleeving can take care of most the direct stresses in BIG HP within the cylinder and the next big problem would be twisting the block. which 40kg extra material around the sides may well fix. i have never seen one. although very interested now as 40kg is allot of extra cast iron, the block must look very fat indeed. how much does an RB30 block weigh? not too much i assume as they are not too hard to move around by hand. my point was simply towards people in here who are thinking of doing this conversion and probably intending to run no where near 1000hp. For the serious drag monsters this could be an avenue worth the while but for streeters and circuit work i don't see the point. unless you have lots of extra time on your hands and want something to do! lets just get a 2jz and stamp nissan on the top Or even better someone just machine up a fresh block and head from a solid billet block. would be nice to get some images of the rd28 and also some measurements. because that's the only way to prove it is stronger.

I like that idea! rather than stuff more air in the head just vent directly out the block/sump is there any other internal modification you have done? drilled, honed anything ? engine bay looks spotless too! do you have a link or picture of these sumps? i had some trouble finding a website!!! thanks.

Plenty of bonets to choose from with a slight bulge isn't there? i know there is more for the silvia than i care to look at.

Is it really worth all the messing around? i can see the interest of seeing if it matches up but really when an Rb30 block is ready to go i fail to see the point. looking at R.I.P.S engines and plenty of other Rb's i think the Rb30 is plenty enough capable of big HP. How much HP are you chasing? I can't see why people seem to think this block will be so much stronger? after all the bores are in the same place and it fits the same head so there is not heaps of extra meat....

looks the goods.

so on that website that would be the 96lb injectors. never thought about getting these. much cheaper than anything else i'v seen.

I think unless you need to re-tap for the 26 sensons you are wasting your time. As you know iron is very dense and has no problems transferring shock through it, especially an inch or so below the standard locations. My best guess to why they are there would be easability of production but i could be wrong. if you look at the Standard RB30 mounting positions they appear to be exactly the same postion as RB20,25,26 so maybe given that the block is identical excluding final height they just sent it down the line and used the same tapping jig as all the others. It may be cast there origionally with good intentions because theoretically deck height or (the furthest contacting point at the end of the stroke) would produce the largest forces as it changes direction.. i could wabble on about forces and piston speeds but it's not relevent. Nissan in short, knows there sh*t and if they think the sensor is ok there then it is!!

fine in SA is a max of 10k. but they can only test you if you go for an inspection. the cops cant look under and assume because they cant see it then it's not there. only EPA can fine you and they must perform emissions testing to prove. plus if ur silly enough to go for an inspection without a cat then u deserve a fine...

Yea, quite common to see these on newer diesel truck engines. clever setup but may be a while before they get tranferrred in to petrol engines. something to look forward too?

I used the top ones also but only because the 26 thread is a different size (like adriano stated) if you are going to use the 25 ones i don't see the point. accuracy would be exactly the same IMO.

at the top of the block you see six 'casts' the top three are blank and the bottom three are tapped. the one on the left and right are used.

Very interesting. if they all published there results it would be clear which ones to buy. Generally i think they will all be of similar metalurgy which is why id be worried about lighter ones. obviously in terms off higher RPM the thicker the cross section the higher the UTS but then as carrillo mention, other factors such as twisting could cause some issues which is why i think the I/H beam designed rods would be hard to beat???

Silly question maybe but there is not a sump extension sitting under there?

I rekon twin systems are the bees knees. if you have one direct exhaust path for each turbo it will not only help flow issues but it gives you more room under the car!!!

Do the manufactures provde strength testing charts????? i'm guessing they don't. that would settle all reasoning.

The forumla is correct but you forgot about the other part of the forumla: v = d/t

It can miss on idle if the coilpacks are worn out... Higher RPM will often see coilpacks missfire in cars that idle normally simply because they are working allot harder as the RPM increases. I'v had a coilpack gradually get worse and worse untill it was a WRX from the first turn of the key.

I would agree, The fact that it holds pressure up until 5500rpm and then after that the pressure creeps would point straight to the wastegate not being able to allow sufficient flow to hold lower pressure than 10psi. The wastegate is open but it still causes enough of a restriction to allow the pressure to increase. Did you check to see if the wastegate can be fully opened with the spring not installed? If that's not the case then you will have to do some altering. could be a restriction anywhere, not just the wastegate.

nope. they all take around 5 litres. street driving is fine, the problem is when ur in high revs for a longer duration, oil is in the head and not on the bearings then it's time for new rings if your lucky.

yea. all RB's. poor design and the sump is too small.

brand new washers should come softened already. Only need to anneal used ones that you have tightened in place before. Annealing non ferrous is the opposite to annealing ferrous. But yea as beer barron said over your stove will be fine then quench it and it's done. The only way you can harden it is if you tighten it up and then take it off again or you happened to have a temperature controlled furnance and bring the heat down veery slowly.... which you don't.

na, i think you'll agree. RB= Roots Backpocket

confirmed by the EPA just then. Very simple a blunt "No, you can not mix and match engines" i asked why and he said the same as what i was told last time "not a production engine" i then asked about any possibility to get it engineered "No". i also asked about RB30et and after a few moments on hold he asked me the year of my car and then bluntly said "No, you cant" Guess that clears it up in SA then. If you want an RB30DE/T/T in SA legally, bad luck.

Hot rodders fall in to a different category. Don't think much matters for them. I spoke too two engineers. One said "this engineer is not prepared to do it" and the other engineer with an excellent reputation said it was not possible simply because the block is from an older engine and my car is pre 86. he said i could go RB26 etc etc with some chassis torque testing and larger brakes and the rest of it but not RB30, not even RB30et. car is a silvia btw. however i suppose if you had a post 86 vehicle (s1 r31?) then maybe it could be worked around if you are willing to fork out $$$ for various testing. But like i said before the EPA never mentioned any of this they simply said you cannot just mix and match engines because the engine must have come from a production vehicle. There was no twin cam RB30. Classic cars seem to get a golden blanked that makes police look and not touch anway, unlike jap cars. i'm about to make a phonecall and ask them again, it was over a year ago when i first looked in to it.