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 that, I'll check it all out. I can always do the brakes last anyway if its a problem.  The 16's are super cool, if they do fit I'll cruise around with them for a bit.  
    • Well, that's kinda the point. The calipers might interfere with the inside of the barrels 16" rims are only about 14" inside the barrels, which is ~350mm, and 334mm rotors only leave about 8mm outboard for the caliper before you get to 350, And.... that;s not gunna be enough. If the rims have a larger ID than that, you might sneak it in. I'd be putting a measuring stick inside the wheel and eyeballing the extra required for the caliper outboard of the rotor before committing to bolting it all on.
    • OK, so again it has been a bit of a break but it was around researching what had been done since I didn't have access to Neil's records and not everything is obvious without pulling stuff apart. Happily the guy who assembled the engine had kept reasonable records, so we now know the final spec is: Bottom end: Standard block and crank Ross 86.5mm forgies, 9:1 compression Spool forged rods Standard main bolts Oil pump Spool billet gears in standard housing Aeroflow extended and baffled sump Head Freshly rebuilt standard head with new 80lb valve springs Mild porting/port match Head oil feed restrictor VCT disabled Tighe 805C reground cams (255 duration, 8.93 lift)  Adjustable cam gears on inlet/exhaust Standard head bolts, gasket not confirmed but assumed MLS External 555cc Nismo injectors Z32 AFM Bosch 023 Intank fuel pump Garret 2871 (factory housings and manifold) Hypertune FFP plenum with standard throttle   Time to book in a trip to Unigroup
    • I forgot about my shiny new plates!
    • Well, apparently they do fit, however this wont be a problem if not because the car will be stationary while i do the suspension work. I was just going to use the 16's to roll the old girl around if I needed to. I just need to get the E90 back on the road first. Yes! I'm a believer! 🙌 So, I contacted them because the site kinda sucks and I was really confused about what I'd need. They put together a package for me and because I was spraying all the seat surfaces and not doing spot fixes I decided not to send them a headrest to colour match, I just used their colour on file (and it was spot on).  I got some heavy duty cleaner, 1L of colour, a small bottle of dye hardener and a small bottle of the dye top coat. I also got a spray gun as I needed a larger nozzle than the gun I had and it was only $40 extra. From memory the total was ~$450 ish. Its not cheap but the result is awesome. They did add repair bits and pieces to the quote originally and the cost came down significantly when I said I didn't need any repair products. I did it over a weekend. The only issues I had were my own; I forgot to mix the hardener into the dye two coats but I had enough dye for 2 more coats with the hardener. I also just used up all the dye because why not and i rushed the last coat which gave me some runs. Thankfully the runs are under the headrests. The gun pattern wasn't great, very round and would have been better if it was a line. It made it a little tricky to get consistent coverage and I think having done the extra coats probably helped conceal any coverage issues. I contacted them again a few months later so I could get our X5 done (who the f**k thought white leather was a good idea for a family car?!) and they said they had some training to do in Sydney and I could get a reduced rate on the leather fix in the X5 if I let them demo their product on our car. So I agreed. When I took Bec in the E39 to pick it up, I showed them the job I'd done in my car and they were all (students included) really impressed. Note that they said the runs I created could be fixed easily at the time with a brush or an air compressor gun. So, now with the two cars done I can absolutely recommend Colourlock.  I'll take pics of both interiors and create a new thread.
×
×
  • Create New...