i was just wondering if you guys could tell me if the RB30 turbo has thicker cylinder walls then just the standard RB30. the reason i am asking is i was wondering about boring out an RB30 non turbo block and am i going to run into any trouble, would i be better of getting an RB30 turbo. this was just a rumour that i heard going around. can yous help us???

exact same block, you shouldn't run into troubles unless running huge boost

86 block's were different to 87,88 block's Just make sure you get a 87,88 block N/A or turbo.

I heard somewhere, don't know if it's true, that series 1 ('86) turbo blocks were heavier???? I don't think u'll have any problems with a ser2 anyway.

UMMMMM I think they were the same weight man!.

On of my friends keeps going on about "cradles" The non turbo blocks dont have cradles in it, and they'll go bang without these cradles. Any idea what he is on about?

All RB30s have a bearing cradle instead of bearing caps (like v8s). series 2 n/a blocks and turbo blocks are exactly the same. Bottom end and head are exactly the same apart from these main parts: - Pistons (for lowering compression) - oil pump - cam shaft grind heads are exactly the same casting as any other rb30, and the n/a series 1 blocks dont have the ready made fittings for the turbo bits. This topic has been done to the death and any other related topics based on n/a -> turbo differences and the like are going to be locked. I understand that you are new here, but learn to use the search function, its there for a reason.

Just a question for 321-CYA. a while back i seen a cressida blow away a skyline gtr. the number plate was 321-CYA. was this u and if so, what motor did the cressida have? someone said it may have been a supra motor.

Quote: Originally Posted by calais_turbo6 UMMMMM I think they were the same weight man!. Have u weigh them both??? I might have to, i have both in my shed!

No i have not weigh them! But i bet you there the same weight man!.

they might be a few grams or kg off, but the blocks would be manufactured the same using the same material, unless they alloyed / refined their iron for better strength at less weight in the turbo/series2 blocks.

I heard the 86 turbo blocks had thicker cylinder walls and were better for higher boost levels than the 87-88 block as someone said they were prone to splitting bores at these levels of boost.

yes apperantly the series 1 blocks had more webbing therefore stronger and better for huge boost, however it is missing some of the inlets for the turbo lines

I thought the 86 were the same block in strengh as the 87,88 one's just that some 86 block's did not have the inlet's for the turbo line's as TURBO87 said! This is strange if holden did this!.

Wall thickness is the same. Series 1 n/a blocks don't have the turbo oil return fittings etc - but other than that, pretty much identical. My new engine is a series II n/a block (old one was a Series 1 turbo block) - had to change blocks because the old block sprung a leak in the #2 bore! That kinda rules-out any series-1 wall thickness superiority theories! My new ser-2 block is cranking out almost 600hp so far (more next week), and no signs of dramas.

What's the latest on your beast 700HP? Is it going to be on the road soon man?.

Nearly done man! Another 4 weeks, and it's complete I reckon. New engine was finished a few weeks ago. Has been run-in on the dyno now, and had a power run or two last week. There were some changes made (some tricks & technology applied) that gave us the same power as last time (580HP) but on 3 psi less boost, and 500 rpm less too - very encouraging. Made 35Nm more Torque too (from 586Nm to 621Nm). Next week, the boost get's wound up after some more manifold changes were made last week, and we'll rev it out to 7000rpm again - and 600HP on pump fuel should be an easy task. Will revive the "Project 700HP Update" thread soon.

Goodnew's mate I'm really excited too LOL. Some original photos have not been recovered yet.

I have a zoom mag with a article about a high HP block that nizpro built it says �Simon used a very early RB30 block specifically because these cores offer slightly thicker cylinder walls, hence offering greater tolerance to the intended boost pressures� Doesn't really answer your question about turbo and non turbo blocks but it should help.

Quote: Originally Posted by Muzza I have a zoom mag with a article about a high HP block that nizpro built it says �Simon used a very early RB30 block specifically because these cores offer slightly thicker cylinder walls, hence offering greater tolerance to the intended boost pressures� Doesn't really answer your question about turbo and non turbo blocks but it should help. Don't want to discredit anything you say, but the workshop in question has made a lot of claims to fame on these engines - 856HP out of one of them - but when it went to the track it reportedly ran times like a 600HP engine. Funnily enough, when this supposed "856HP" engine was on the same dyno I'm using, apparently (according to the dyno owner) it could only muster up 620HP on 44PSI boost and C16! Proving again that the 400 metre dyno never lies! I've learned not to always take other's words as Gospel - a lot of advice printed in mags like Zoom - I've had to found out for myself that it's simply untrue or misleading - perhaps other workshop's way of putting competition off their scent? - if you know what I mean. Now what was all that for? Well maybe the series 1 blocks do have wall thickness - but maybe they don't. I know that they certainly didn't for me. Not everything you read is factual - and I guess, to be fair, that can equally be applied to things I type.