Jump to content
SAU Community

Recommended Posts

Hi all. First off I'm no expert in skyline engines. Now thats out of the way.

Block I'm using is a s2 block. Std crank spool h beam rods and arias -10.4cc forged pistons. Block will get the usual jobss done acid wash hot tank and bored 40th to 87mm. Will be decked to zero deck height. Will use a 1 mm head gasket and neo head. Head is currently in the car on 25 neo engine. Head has been ported with stage 1 pon cams. Flywheel is from extreme billet lighten flywheel. 6 puck sprung button clutch. Inlet will be a greedy copy manifold with 1000cc bosch injectors. Hot side is custom made hi mount manifold by myself in t3 form to a gtx3582r garrett ball bearing item. Fuel will flow via 2 bosch 044 pumps. Will start with bp98 fuel then change over to e85 later on. Nistune will control all the electronics. Spit fire coil packs will fire the good stuff.

If anyone has same sort of set up would appreciate input as to what power I should be able to expect.

Link to comment
https://www.sau.com.au/forums/topic/451449-rb30-25-neo-build/
Share on other sites

301 to 399 rwkw. Too many unknowns. Is it going to be fully balanced with a new harmonic balancer and revved to 9000+ or standard and limited to 7000? Build and tune all count for a lot. You may end up with a sky high compression ratio which will be a problem unless you have access to E85. Don't use Bosch pumps - get something more modern, quieter and E85 friendly.

Those pistons are vl turbo spec.

Have you already bought them?

If not look seriously at something with less or no dish to get the comp up. The days of low comp have been and gone.

If you already have them, no worries, boost it up!

Looks like boost up as I have them already. For 700 delivered not going to complain. Will deck the head and use as thin as possible gasket. Head is fitted with cams 256deg and 9.15mm lift. E85 is available easy access. Will be balanced annd haven't set a rev limit yet

Besides this engine is going into a lc torana witch is around 400+kgs lighter than a r34 skyline. Neos run 9 to 1 comp but are 2.5lt engine. This is a 3lt engine. Off boost shouldn't be too bad as the 30det's only run a mid 7 to 1 comp. Off boost in a vl they are fine.

If 0 deck heights min HG thickness is 33thuo for clearance

I think the dish is a bit big can you machine them down 40-60thuo and then deck block to match

I run 14cc dome top with 0 deck hieght and 1.1mm HG with 63cc combustion chamber ( 26 head ) and have +/- 9.5:1 state CR

I can machine the pistons down 40th and take 40th off the head. 8.44 to 1 was working on 1mm hg. By doing pistons and head machine work will bump it up around 9 to 1. Have looked at the 30 hybrid pages and read verrious builds but not close to what I'm building. Haven't seen any other builds with neo head and gtx35

I've got the bulk of my engine together now

Rb30, Neo head,

Spool I beams

Wiseco 9cc dish pistons.

.051" gasket

Head studs main studs

Standard head and cams to start with but has springs and ti retainers

CPC plenum 6boost manifold gt35

6x LS2 coils

Running a .001 deck height and we had to deck the head down to 46cc ending up with high 8 comp.

I'm hoping to make around 400-450hp with the standard cams on 98 (auto)

Hey lcxu105

I think you may have messed up there with your gasket thickness. Because you're using mm but you are using inches measurement for the gasket. The gasket should be 1.295mm

Using the calculator above. mine comes out to be about 8.94:1

using the summit racing calculator (which allows to you to change hg to inches or mm) I get 8.98: 1

Mind you I could be wrong

Edited by Huzqld

Huzqld you're comp ratio will be a high 9.6 to 1. Mine with a .51 hg and 50cc head wwill be 8.96 to 1.

you have to put the HG thickness in in MM on that scale setup, so you have put in .51mm not 51thou which is closer to 1.3mm

Edit, should have read the whole page before posting lol, Husqld beat me to it :D

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Thanks for doing that Duncan! Makes you a good person in my books. We don't get kangaroos or wombats here. But we have bats and it's similar. AFAIK it's often the mums with a baby attached that get hit because they drop lower when starting from a tree. If you hit an animal, check on it. https://www.ifaw.org/au/resources/wildlife-rescue-app An app to get the closest wildlife rescue contact.
    • My dream is also to have a proper hoist, but I don't think it will ever happen. My quickjack is probably as close as I'll ever get, it really is very good though. 
    • Yeah we keep on in the dailies, it is pretty poor how many animals get hit and the driver leaves without checking....have saved a couple of little ones over the years. Bit of a gruesome job though, pouches generally need to be cut open because they are so tight and often the joey doesn't realise mum is gone so they are still locked onto the teat. I checked the modules in front of the DS wheel where an oil cooler should go.... There is the radar unit - that can go for race use) One of the 2 HX water pumps, the silver cylinder. That needs to be kept but might be able to be relocated But the bad news, the big computer mounted vertically in front of the wheel (blocking any potential air exit) is the electric steering computer. That is required until/unless i do a hydraulic steering conversion, and in CAD based modern car design it is not like I can just pop a big unit like that somewhere else (plus the loom would be too short anywhere else too). So, the passenger side is OK to clear out (just use a smaller washer reservoir, potentially elsewhere), but the DS no beuno
    • Well, all the best with the new camry It was interesting to hear about the UK process, it is generally a lot more streamlined here with a shipping agent looking after all the import side (noting the exact final price can still be a surprise.....) and I've used a few different brokers on the japan (or US) side, and never had any trouble with any of them....luck of the draw I guess. You mentioned you didn't get the auction sheet (understandable since you bought it from a dealer, not auction), but I always try and get hold of that because they are pretty thorough. I've imported 2x R grade vehicles over the years and both were fine, repairs in Japan are pretty thorough compared to here in Oz.
    • BTW I measured the jack I have, it is 70mm at the saddle but you only have about 700 until it returns to 150mm high at the cylinder so it is good but no magic bullet.
×
×
  • Create New...